1) 0.2 moles of a gas has a mass of 12.8 g. Which of the following could be the molecular formula of the gas? a) SO2 b) CO2 c) CO d) NH3 2) This equation will be balanced when a) x = 1 and y = 2 b) x = 2 and y = 2 c) x = 3 and y = 2 d) x = 2 and y = 3 3) 0.25 moles of a gas has a mass of 7 g. Which of the following could be the molecular formula of the gas? a) C2H6 b) C2H4 c) C3H8 d) C3H6 4) This equation will be balanced when  a) x = 1, y = 2 and z = 1 b) x = 2, y = 3 and z = 2 c) x = 3, y = 2 and z = 3 d) x = 4, y = 3 and z = 4 5) Which of the following solutions contains the least number of moles of solute? a) 100 cm3 of 0.4 mol l-1 solution b) 200 cm3 of 0.3 mol l-1 solution c) 300 cm3 of 1.0 mol l-1 solution d) 400 cm3 of 0.5 mol l-1 solution 6) This equation will be balanced when a) x = 1, y = 2 and z = 2 b) x = 1, y = 1 and z = 2 c) x = 2, y = 2 and z = 1 d) x = 2, y = 2 and z = 2 7) 0.1 moles of sodium hydroxide was dissolved in water and the solution made up to 250 cm3. What is the concentration, in mol l-1, of sodium hydroxide solution? a) 0.0004 b) 0.025 c) 0.4 d) 2.5 8) A 100 cm3 of a solution contained 3.19 g of copper (II) sulfate. The concentration of the solution, in mol l-1, is a) 0.2 b) 0.02 c) 0.002 d) 0.0002

Balanced Equations and Calculations

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