Free NEET Chemistry multiple-choice questions on Stoichiometry & Calculations. Attempt each question and reveal the answer with a full explanation.
If 500 mL of a 5 M solution is diluted to 1500 mL , what is the molarity of the solution obtained? 1.66 M 2.50 M 1.50 M 0.75 M Calculate the molality of a solution containing 10 g of NaOH in 500 g of water. 0.5 m 0.25 m 1.0 m 0.1 m The number of neutrons in 0.45 g of water is: (Assume H= 1H and O= 16 O ) 0.20 N A 0.25 N A 0.10 N A 0.45 N A What volume of 0.2 M NaOH is needed to neutralize 50 mL of 0.1 M H 2SO 4 ? 50 mL 25 mL 100 mL 75 mL A mixture of 200 mL of 0.1 M HCl and 100 mL of 0.2 M BaCl 2 is prepared. What is the final molarity of chloride ions ( Cl - ) in the solution? 0.2 M 0.133 M 0.3 M 0.1 M How many moles of H 2 gas will be produced when 0.5 moles of Aluminum reacts with excess NaOH solution? 0.75 moles 0.5 moles 1.0 mole 0.25 moles What is the concentration of Na + ions in a solution containing 5.85 g of NaCl and 14.2 g of Na 2SO 4 in 500 mL of solution? 0.6 M 0.4 M 0.2 M 0.5 M What is the volume of water required to dilute 10 mL of 10 M HNO 3 to a 0.1 M solution? 990 mL 1000 mL 900 mL 100 mL What mass of Mg(OH) 2 is required to neutralize 20 mL of 0.5 M HCl ? 0.29 g 0.58 g 0.145 g 1.0 g If the density of methanol is 0.793 kg/L , what is its volume needed for making 2.5 L of its 0.25 M solution? 25.2 mL 2.52 mL 50.4 mL 12.6 mL The density of 1 M solution of Na 2CO 3 is 1.06 g/mL . The molality of this solution is: 1.05 m 1.0 m 1.2 m 0.95 m How many moles of Magnesium Phosphate, Mg 3(PO 4) 2 , will contain 0.25 moles of oxygen atoms? 3.125 10 -2 moles 0.02 moles 0.125 moles 2.5 10 -2 moles In a reaction A + B 2 AB 2 , identify the limiting reagent if 300 atoms of A react with 200 molecules of B 2 . B 2 A Both are consumed completely None A plot of log x/m versus log p for the adsorption of a gas on a solid gives a straight line with slope equal to: - K n 1 n K CsBr crystallizes in a body centred cubic lattice. The unit cell length is 436.6 pm. Given that the atomic mass of Cs = 133 and that of Br = 80 amu and Avogadro number being 6.02 10 23 mol -1 , the density of CsBr is:- 42.5 g/cm 3 0.425 g/cm 3 8.25 g/cm 3 4.25 g/cm 3 A mixture of 2.3 g formic acid and 4.5 g oxalic acid is treated with conc. H2SO4 . The evolved gaseous mixture is passed through KOH pellets. Weight (in g) of the remaining product at STP will be 2.8 3.0 1.4 4.4 Which mixture of the solutions will lead to the formation of negatively charged colloidal [AgI] - sol ? 50 mL of 0.1 M AgNO3 + 50 mL of 0.1 M KI 50 mL of 1 M AgNO3 + 50 mL of 1.5 M KI 50 mL of 1 M AgNO3 + 50 mL of 2 M KI 50 mL of 2 M AgNO3 + 50 mL of 1.5 M KI Match the following and identify the correct option. array ll (a) CO(g) + H2(g) & (i) Mg(HCO3)2 + Ca(HCO3)2 (b) Temporary hardness of water & (ii) An electron deficient hydride (c) B2H6 & (iii) Synthesis gas (d) H2O2 & (iv) Non-planar structure array (iii) (ii) (i) (iv) (iii) (iv) (ii) (i) (i) (iii) (ii) (iv) (iii) (i) (ii) (iv) A mixture of 2.3 g formic acid and 4.5 g oxalic acid is treated with concentrated H 2SO 4 . The evolved gaseous mixture is passed through KOH pellets. Weight (in g) of the remaining product at STP will be: 2.8 3.0 1.4 4.4 The density of 2 M aqueous solution of NaOH is 1.28 g/cm 3 . The molality of the solution is: 1.67 m 2.14 m 1.56 m 2.00 m 20 g of CaCO 3 on heating gives CO 2 which occupies a volume of 1.12 L at STP. The percentage purity of CaCO 3 is: 25 % 50 % 75 % 100 % The density of a solution prepared by dissolving 120 g of urea (mol. mass = 60 u ) in 1000 g of water is 1.15 g/mL . The molarity of this solution is: 2.05 M 1.02 M 0.50 M 1.78 M How many moles of P 4O 10 will be produced by the combustion of 2.0 moles of P 4 in the presence of 8.0 moles of O 2 ? 1.6 moles 2.0 moles 1.0 mole 0.8 moles How many significant figures are present in the result of the following calculation? 0.02856 298.15 0.112 / 0.5785 3 4 2 5 The density of 3 M solution of NaCl is 1.25 g/mL . The molality of the solution is: (Atomic mass: Na=23, Cl=35.5 ) 2.79 m 3.00 m 1.25 m 3.71 m The number of neutrons in 7 mg of 14 C is: 2.4 10 21 3.0 10 21 1.2 10 21 6.0 10 20 What is the molarity of a solution of ethanol in water in which the mole fraction of ethanol is 0.040 ? (Assume the density of water to be 1 g/mL ) 2.31 M 1.50 M 0.04 M 3.20 M 1.0 g of a metal, which has a specific heat of 0.06 cal/g o C , combines with oxygen to form 1.152 g of its oxide. What is the approximate atomic mass of the metal? 100 64 50 200 The density of 3 M solution of Na 2S 2O 3 is 1.25 g/mL . Calculate the percent by mass of Na 2S 2O 3 . 37.92 % 40.2 % 25.3 % 50.5 % If the density of a 3 M solution of KCl is 1.0 g/mL , the molality of the solution is approximately: (At. mass K=39, Cl=35.5 ) 3.86 m 3.00 m 2.50 m 4.20 m The density of 2 molal aqueous solution of NaOH is 1.10 g/mL . The molarity of the solution is: 2.04 M 2.00 M 1.85 M 2.20 M Suppose the elements X and Y combine to form two compounds XY 2 and X 3Y 2 . When 0.1 mole of XY 2 weighs 10 g and 0.05 mole of X 3Y 2 weighs 9 g , the atomic weights of X and Y are: 40, 30 30, 20 20, 30 60, 40 Calculate the mass of CaO that shall be obtained by heating 5 kg of 80 % pure limestone ( CaCO 3 ). 2.24 kg 2.80 kg 3.50 kg 4.00 kg Percentage of Se in peroxidase anhydrous enzyme is 0.5 % by weight (at. wt. = 78.4 ). Then minimum molecular weight of peroxidase anhydrous enzyme is: 1.568 10 4 1.568 10 3 15.68 3.136 10 4 What is the mass of oxygen present in 0.5 mole of H 2SO 4 ? 32 g 64 g 16 g 98 g The number of moles of KMnO 4 reduced by 1 mole of KI in alkaline medium is: 2 1 1/5 5 The density of 2.05 M solution of acetic acid in water is 1.02 g/mL . The molality of the solution is: 2.28 mol/kg 0.44 mol/kg 1.14 mol/kg 3.28 mol/kg The total number of electrons in 9.5 g of PO 4 3- ion is: (At. mass P=31, O=16 ) 5 N A 0.5 N A 50 N A 4.7 N A In a reaction 2KClO 3 2KCl + 3O 2 , if 12.25 g of KClO 3 is decomposed and 3.84 g of O 2 is obtained, the percentage yield is: (Molar mass KClO 3 = 122.5 g/mol ) 80 % 100 % 75 % 90 % The molarity of a solution obtained by mixing 750 mL of 0.5 M HCl with 250 mL of 2 M HCl is: 0.875 M 1.00 M 1.25 M 1.75 M In the reaction 3Mg + N 2 Mg 3N 2 , 48 g of Mg reacts with excess N 2 . The mass of Mg 3N 2 formed is: (At. wt. Mg=24, N=14 ) 67.3 g 100 g 50 g 134.6 g A solution of NaOH is 10 % by weight. If the density of the solution is 1.1 g/mL , the molarity of the solution is: 2.75 M 1.1 M 4.0 M 10 M Which of the following contains the maximum number of protons? 1.0 g of H 2 1.0 g of He 1.0 g of Li 1.0 g of Be If the density of a solution is 1.20 g/mL and the molality is 2.0 m , what is the molarity of the solution? (Molar mass of solute = 100 g/mol ) 1.71 M 2.00 M 2.40 M 1.20 M Calculate the molarity of a 20 % (w/w) aqueous solution of KI . (Density of solution = 1.206 g/mL ) 1.45 M 1.20 M 1.00 M 1.60 M Calculate the number of moles of oxygen atoms in 160 g of ozone ( O 3 ). 10 moles 3.33 moles 5 moles 2.5 moles How many moles of Al 2(SO 4) 3 can be made from 0.6 moles of Al and 0.6 moles of H 2SO 4 ? 0.2 mole 0.3 mole 0.6 mole 0.1 mole What is the molarity of Cl - ions in a solution obtained by mixing 100 mL of 0.1 M NaCl and 100 mL of 0.1 M MgCl 2 ? 0.15 M 0.20 M 0.30 M 0.10 M A sample of hard water contains 100 ppm of MgSO 4 . The molarity of MgSO 4 in this water is: (Molar mass of MgSO 4 = 120 g/mol ) 8.33 10 -4 M 1.2 10 -3 M 1.0 10 -4 M 8.33 10 -3 M If the density of a 3.0 M solution of Na 2CO 3 is 1.2 g/mL , the mass percent of Na 2CO 3 is: (Molar mass = 106 g/mol ) 26.5% 31.8% 21.2% 15.5% The percentage of Sulfur in an organic compound is 16 % . If one molecule of the compound contains 2 atoms of Sulfur, its molecular mass will be: 400 u 200 u 800 u 600 u Which of the following contains the maximum number of atoms? 18 g of H 2O 18 g of O 2 18 g of CO 2 18 g of CH 4 A hydrated sulfate of a metal contains 25.22 % of the metal and 45.3 % water of crystallization. If the atomic weight of the metal is 56 , what is the number of water molecules in the hydrate? (Assume formula MSO 4 xH 2O ) 7 5 2 10 A sample of O 3 gas is 50 % dissociated into O 2 . The average molar mass of the resulting mixture is: 38.4 g/mol 48 g/mol 32 g/mol 40 g/mol A mixture of CO and CO 2 has a vapour density of 15 at STP. What is the mole percentage of CO in the mixture? 87.5 % 12.5 % 50 % 25 % Calculate the molality of 1 L solution of 93 % H 2SO 4 (w/v). The density of the solution is 1.84 g/mL . 10.42 m 9.5 m 11.2 m 8.8 m Which of the following contains the same number of atoms as 1 g of silver ( Ag )? (Atomic mass of Ag = 108, Mg = 24, C = 12, N = 14 ) 1 108 g of C 1 g of Mg 14 108 g of N 12 108 g of C The amount of carbon dioxide evolved upon complete combustion of 116 g of n-butane is (Given: atomic mass in amu H = 1, C = 12 and O = 16) 352 g 322 g 176 g 362 g What is the mass of C-14 in 7 mg of 14 C ? (Given N A = 6 10 23 ) 7 10 -3 g 14 10 -3 g 6 10 20 g 1 10 -3 g According to Gay-Lussac's law of gaseous volumes, 20 mL of hydrogen will require how much volume of oxygen for complete reaction to form water? 10 mL 20 mL 5 mL 40 mL The product of 2.5 and 1.25 should be reported as: 3.1 3.125 3.13 3.12 A substance has a concentration of 5 ppm in water. This is equivalent to saying that: 5 mg of substance is in 1 kg of solution 5 g of substance is in 1 L of solution 5 mg of substance is in 100 mL of solution 0.5 g of substance is in 1 kg of solution In a reaction 2A + 4B 3C + 4D , when 5 moles of A react with 6 moles of B , the limiting reagent is: B A C D How many grams of glucose ( C 6H 12 O 6 ) are required to prepare 250 mL of a 0.1 M solution? 4.5 g 18.0 g 9.0 g 2.25 g What is the final molarity of NaOH when 500 mL of 0.1 M NaOH is mixed with 500 mL of 0.2 M NaOH ? 0.15 M 0.3 M 0.12 M 0.25 M How many moles of oxygen atoms are present in 1 mole of Calcium Chlorate, Ca(ClO 3) 2 ? 6 3 2 5 The number of moles of hydrogen molecules required to produce 20 moles of ammonia through Haber's process is: 30 moles 10 moles 20 moles 40 moles What is the mass of 0.5 moles of sodium carbonate ( Na 2CO 3 )? (At. mass: Na=23, C=12, O=16 ) 53 g 106 g 26.5 g 44 g If 1 mole of CH 4 is burnt, what is the number of moles of water produced? 2 1 4 3 What is the concentration of sugar ( C 12 H 22 O 11 ) in mol L -1 if its 20 g are dissolved in enough water to make a final volume up to 2 L ? 0.029 M 0.585 M 0.014 M 0.058 M How many oxygen atoms are in 0.25 moles of Ca(NO 3) 2 ? 1.5 N A 0.5 N A 0.25 N A 3.0 N A Which concentration term is most suitable for comparing the chemical reactivity of different solutions? Normality Molality Mass percent Molarity What is the density of CO 2 gas at STP ( 273 K , 1 atm ) in g/L ? 1.96 1.43 2.50 0.89 The number of significant figures in the result of the calculation 4.32 10 3 0.025 1.2 is: 2 1 3 4 How many moles of O 2 are required for the complete combustion of 1 mole of Butane ( C 4H 10 )? 6.5 4.0 5.0 13.0 10 g of hydrogen and 64 g of oxygen were filled in a steel vessel and exploded. Amount of water produced in this reaction will be - 1 mol 2 mol 3 mol 4 mol When 22.4 litres of H2(g) is mixed with 11.2 litres of Cl2(g) , each at S.T.P., the moles of HCl(g) formed is equal to :- 1 mol of HCl(g) 2 mol of HCl(g) 0.5 mol of HCl(g) 1.5 mol of HCl(g) 1.0 g of magnesium is burnt with 0.56 g O2 in a closed vessel. Which reactant is left in excess and how much ? (At. wt. Mg = 24 ; O = 16 ) Mg, 0.16 g O2 , 0.16 g Mg, 0.44 g O2 , 0.28 g Which of the following organic compounds polymerizes to form the polyester Dacron? Propylene and para HO-(C6H4)-OH Benzoic acid an ethanol Terephthalic acid and ethylene glycol Benzoic acid and para HO-(C6H4)-OH The number of moles of hydrogen molecules required to produce 20 moles of ammonia through Haber's process is : 40 10 20 30 What mass of 95% pure CaCO3 will be required to neutralise 50 mL of 0.5 M HCl solution according to the following reaction? CaCO3(s) + 2HCl(aq) -> CaCl2(aq) + CO2(g) + 2H2O(l) [Calculate upto second place of decimal point] 1.32 g 3.65 g 9.50 g 1.25 g The right option for the mass of CO2 produced by heating 20 g of 20% pure limestone is (Atomic mass of Ca = 40) [ CaCO3 ->[1200 K] CaO + CO2 ] 1.12 g 1.76 g 2.64 g 1.32 g 1 gram of sodium hydroxide was treated with 25 mL of 0.75 M HCl solution, the mass of sodium hydroxide left unreacted is equal to 750 mg 250 mg Zero mg 200 mg When 1 dm 3 of CO2 gas is passed over hot coke, the volume of gaseous mixture after complete reaction at STP becomes 1.4 dm 3 . The composition of the gaseous mixture at STP is: 0.6 dm 3 of CO , 0.8 dm 3 of CO2 0.8 dm 3 of CO , 0.8 dm 3 of CO2 0.6 dm 3 of CO , 0.4 dm 3 of CO2 0.8 dm 3 of CO , 0.6 dm 3 of CO2 How many moles of oxygen atoms are required to form 0.2 moles of P 4O 10 ? 2.0 moles 0.2 moles 1.0 mole 0.8 moles What is the mass of precipitate formed when 50 mL of 16.9 % solution of AgNO 3 is mixed with 50 mL of 5.8 % NaCl solution? 7.02 g 28.1 g 14.05 g 5.0 g In the reaction 2Mg(s) + O 2(g) 2MgO(s) , if 1.0 g of Mg is burnt with 0.56 g of O 2 in a closed vessel, which reactant is left in excess and how much? Mg, 0.16 g O 2, 0.16 g Mg, 0.44 g O 2, 0.28 g What is the mole fraction of the solute in a 1.00 m aqueous solution? 0.0177 0.177 1.770 0.0344 How many moles of magnesium phosphate, Mg 3(PO 4) 2 will contain 0.25 mole of oxygen atoms? 3.125 10 -2 1.25 10 -2 2.5 10 -2 0.02 Volume of O 2 required at STP for the complete combustion of 1 mole of ethane ( C 2H 6 ) is: 78.4 L 22.4 L 44.8 L 89.6 L A mixture of N 2 and Ar gases in a cylinder contains 7 g of N 2 and 8 g of Ar . If the total pressure of the mixture of the gases in the cylinder is 27 bar , the partial pressure of N 2 is: 15 bar 12 bar 9 bar 18 bar How many moles of electrons weigh one kilogram? (Mass of electron = 9.1 10 -31 kg ) 1 9.1 10 -31 6.022 10 23 6.022 10 23 1 9.1 10 -31 9.1 10 31 What is the total number of protons in 10 g of Calcium Carbonate ( CaCO 3 )? 3.011 10 24 6.022 10 23 50 6.022 10 23 2.04 10 24 Given the reaction: N 2(g) + 3H 2(g) 2NH 3(g) . How many litres of NH 3 will be formed when 10 L of N 2 reacts with 20 L of H 2 at the same temperature and pressure? 13.33 L 20 L 10 L 40 L The amount of zinc (At. wt = 65 ) required to produce 224 mL of H 2 at STP on treatment with dilute H 2SO 4 is: 0.65 g 6.5 g 0.065 g 65 g In the combustion of 2 g of Hydrogen in 16 g of Oxygen, the amount of water formed is: 18 g 16 g 2 g 32 g In the reaction 4NH 3(g) + 5O 2(g) 4NO(g) + 6H 2O(g) , when 1 mole of ammonia and 1 mole of O 2 are made to react to completion, then: All the oxygen will be consumed 1.0 mole of NO will be produced 1.0 mole of H 2O will be produced All the ammonia will be consumed Calculate the number of oxygen atoms in 0.2 moles of Na 2CO 3 10H 2O . 1.565 10 24 6.022 10 23 1.204 10 24 2.6 10 24 What volume of 0.1 M H 2SO 4 is required to exactly neutralize 50 mL of 0.2 M NaOH ? 50 mL 100 mL 25 mL 200 mL 10 g of hydrogen and 64 g of oxygen were filled in a steel vessel and exploded. Amount of water produced in this reaction will be: 4 mol 3 mol 2 mol 5 mol The density of neon is highest at: 0 o C, 2 atm STP 273 o C, 1 atm 0 o C, 0.5 atm Calculate the number of Mg 2+ ions in 19.0 g of MgCl 2 . (Atomic mass: Mg=24, Cl=35.5 ) 1.2044 10 23 6.022 10 23 3.011 10 23 1.2044 10 22 The percentage weight of Zn in white vitriol ( ZnSO 4 7H 2O ) is approximately: (At. mass: Zn=65, S=32, O=16, H=1 ) 22.65 % 33.33 % 41.22 % 28.51 % What is the mass of precipitate formed when 100 mL of 0.1 M AgNO 3 is mixed with 100 mL of 0.1 M NaCl ? 1.435 g 14.35 g 2.87 g 0.717 g What is the concentration of chloride ions in a solution prepared by dissolving 11.1 g of CaCl 2 in water to make 500 mL of solution? (Molar mass of CaCl 2 = 111 g/mol ) 0.4 M 0.2 M 0.1 M 0.8 M Which of the following contains the same number of nitrogen atoms as 2.8 g of N 2 gas? 1.7 g of NH 3 4.4 g of N 2O 1.4 g of N 2 6.0 g of NO What is the mass of phosphorus present in 1.0 mole of Calcium Phosphate, Ca 3(PO 4) 2 ? 62 g 31 g 124 g 93 g 20 mL of methane ( CH 4 ) is burnt with 50 mL of oxygen ( O 2 ). After combustion and cooling to room temperature, the volume of the gas mixture left will be: 30 mL 40 mL 70 mL 20 mL How many moles of KClO 3 are needed to produce 2.4 moles of O 2 gas by thermal decomposition? 1.6 moles 2.4 moles 1.2 moles 3.6 moles Calculate the mass of NaOH required to neutralize 100 mL of 0.1 M H 2SO 4 . 0.8 g 0.4 g 0.2 g 1.6 g In a reaction A + B AB , if 10 g of A reacts with 10 g of B , which statement is true if the molar mass of A is 10 g/mol and B is 20 g/mol ? B is the limiting reagent A is the limiting reagent Both are consumed completely Product AB formed is 20 g Which of the following possesses the highest mass? 2 moles of CO 2 2 g-atom of Nitrogen 6.022 x 10 23 molecules of H 2O 11.2 L of O 2 at STP The molarity of a 10 % (w/w) NaOH solution with density 1.1 g/mL is: 2.75 M 2.50 M 1.10 M 3.00 M How many moles of Mg are required to react with excess HCl to produce 5.6 L of H 2 gas at STP? 0.25 mol 0.50 mol 1.00 mol 0.10 mol The amount of BaSO 4 formed on mixing 100 mL of 0.1 M BaCl 2 with 100 mL of 0.2 M H 2SO 4 is: 0.01 mol 0.02 mol 0.03 mol 0.1 mol What is the total number of oxygen atoms present in 34.2 g of aluminum sulfate [Al 2(SO 4) 3] ? (Given: Molar mass of Al 2(SO 4) 3 = 342 g/mol ) 7.224 10 23 6.022 10 23 1.204 10 24 3.42 10 22 What is the molarity of liquid HCl if the density of the solution is 1.17 g/cm 3 ? 32.05 M 12.1 M 36.5 M 18.25 M In a reaction A + 5B P , if 1 mole of A and 1 mole of B are taken, which is the limiting reagent? B A Neither P How many moles of lead (II) chloride will be formed from a reaction between 6.5 g of PbO and 3.2 g of HCl ? 0.029 0.044 0.333 0.011 The number of neutrons in 1.8 g of water ( H 2O ) is: 4.818 10 23 6.022 10 23 1.204 10 23 0.8 10 23 The mass of CO 2 produced from 2.0 g of Carbon reacting with 16.0 g of Oxygen is: 7.33 g 22.0 g 44.0 g 18.0 g If 0.50 moles of BaCl 2 is mixed with 0.20 moles of Na 3PO 4 , the maximum number of moles of Ba 3(PO 4) 2 that can be formed is: 0.10 0.50 0.20 0.70 The density of 10 % (by mass) aqueous solution of H 2SO 4 is 1.07 g/cm 3 . The molality of the solution is: 1.13 m 1.02 m 1.84 m 0.11 m When 100 mL of 1 M NaOH solution is mixed with 10 mL of 10 M NaOH solution, the resulting molarity will be: 1.82 M 2.0 M 1.1 M 5.5 M The number of significant figures in the sum of 12.11 , 18.0 , and 1.012 is: 3 4 2 5 What volume of oxygen gas at STP is required to burn 11.2 L of methane gas ( CH 4 ) at STP completely? 22.4 L 11.2 L 44.8 L 5.6 L What is the mole fraction of the solute in a 1.00 molal aqueous solution? 0.0177 0.1770 0.0344 1.0000 In a reaction 4A + 2B + 3C A 4B 2C 3 , what is the limiting reagent if 0.6 moles of A , 0.5 moles of B and 0.5 moles of C are reacting? A B C None What is the mass of Calcium Oxide ( CaO ) formed by heating 25 g of CaCO 3 ( 100 % pure)? 14 g 28 g 56 g 7 g What mass of Fe 2O 3 will react completely with 2.8 g of Carbon Monoxide according to the reaction: Fe 2O 3 + 3CO 2Fe + 3CO 2 ? 5.33 g 16.0 g 2.8 g 10.6 g Calculate the volume of CO 2 gas evolved at STP when 5 g of Calcium Carbonate is treated with excess HCl . 1.12 L 2.24 L 0.56 L 11.2 L The density of a gas at STP is 1.43 g/L . The molar mass of the gas is approximately: 32 g/mol 16 g/mol 44 g/mol 28 g/mol What volume of water should be added to 100 mL of 5 M H 2SO 4 to obtain a solution of 0.5 M ? 900 mL 1000 mL 400 mL 500 mL What volume of Oxygen at STP is required for the complete combustion of 2.2 g of Propane ( C 3H 8 )? 5.6 L 11.2 L 2.24 L 4.48 L The mass of 1.5 moles of O 2 is equal to the mass of how many moles of O 3 ? 1.0 1.5 2.0 0.5 When 4 g of Hydrogen reacts with 20 g of Oxygen to form water, the limiting reagent is: Oxygen Hydrogen Water None What is the normality of a 0.1 M solution of H 3PO 3 (phosphorous acid)? 0.2 N 0.1 N 0.3 N 0.4 N Hemoglobin contains 0.334 % of iron by weight. The molecular weight of hemoglobin is approximately 67200 . The number of iron atoms (Atomic weight of Fe = 56 ) present in one molecule of hemoglobin is: 4 2 3 1 Calculate the volume of O 2 required at STP to react completely with 2.8 g of Carbon Monoxide ( CO ) to form CO 2 . 1.12 L 2.24 L 0.56 L 22.4 L A solution is prepared by adding 2 g of a substance A to 18 g of water. The mass percent of the solute A is: 10 % 11.1 % 9 % 20 % In a chemical reaction, 2.0 g of H 2 reacts with 32.0 g of O 2 . The mass of water formed will be: 18.0 g 34.0 g 36.0 g 16.0 g The total number of valence electrons in 4.4 g of CO 2 is: 1.6 N A 0.1 N A 2.2 N A 4.4 N A Calculate the mass of Al required to produce 11.2 L of H 2 at STP by the reaction: 2Al + 6HCl 2AlCl 3 + 3H 2 . 9.0 g 27.0 g 13.5 g 18.0 g A mixture of 2.0 moles of CH 4 and 3.0 moles of C 2H 6 is burned in excess oxygen. The total number of moles of CO 2 produced is: 8.0 5.0 2.0 6.0 The number of atoms in 1.8 g of water ( H 2O ) is: 1.806 x 10 23 6.022 x 10 22 1.204 x 10 23 6.022 x 10 23 Identify the limiting reagent when 1.0 g of Mg is reacted with 1.0 g of S to form MgS . Mg S Both are consumed completely MgS What mass of KClO 3 is needed to generate 6.72 L of O 2 gas at STP? ( 2KClO 3 2KCl + 3O 2 ) 24.5 g 12.25 g 49.0 g 36.75 g A sample of CaCO 3 contains 3.011 10 23 oxygen atoms. The mass of the sample is: 16.67 g 100 g 50 g 33.3 g According to the Dulong-Petit Law, if the specific heat of a solid element is 0.031 cal/g C , its approximate atomic mass would be: 206 108 56 197 How many moles of Magnesium ions are present in 100 mL of 0.5 M Mg 3(PO 4) 2 solution? 0.15 0.05 0.50 0.10