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HIGHER GRADE CHEMISTRY CALCULATIONS

HIGHER GRADE CHEMISTRY CALCULATIONS. The molar volume is the volume occupied by one mole of a gas. Worked example 1. In an experiment the density of carbon dioxide was measured and found to be 1.85 g l -1 . Calculate the molar volume of carbon dioxide. Molar Volume. 1.85 g occupies 1 litre.

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HIGHER GRADE CHEMISTRY CALCULATIONS

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  1. HIGHER GRADE CHEMISTRY CALCULATIONS The molar volume is the volume occupied by one mole of a gas. Worked example 1. In an experiment the density of carbon dioxide was measured and found to be 1.85 g l-1. Calculate the molar volume of carbon dioxide. Molar Volume. 1.85 g occupies 1 litre 1 mole of CO2 weighs 44g So 1 mole, 44 g occupies 44/1.85 x 1 = 23.78 litres Worked example 2. As gas has a molar volume of 24 litres and a density of 1.25 g l -1. Calculate the mass of 1 mole of the gas. 1 litre of the gas weighs 1.25g So 1 mole, 24 litres weighs 24 x 1.25 = 30 g

  2. Calculations for you to try. • Under certain conditions oxygen has a density of 1.44 gl-1. • Calculate the molar volume of oxygen under these conditions. 1.44g occupies1 litre. 1 mole of O2 weighs 32g So 1mole, 32g occupies 32/1.44 litres = 22.22 litres • A gas has a density of 2.74 gl-1 and a molar volume of 23.4 l mol-1. • Calculate the molecular mass of the gas. 1 litre of the gas weighs 2.74 g So 1 mole, 23.4 litres weighs 23.4 x 2.74 = 64.1 g Higher Grade Chemistry

  3. Calculations for you to try. • Use the data below to calculate the molecular mass of gas X. • Mass of empty bottle = 64.531 g • Mass of bottle filled with gas X = 64.867g • Capacity of bottle = 500 cm3 • Molar volume of gas X = 23.8 litres Volume of gas in litres = 500/1000 = 0.5 litres Mass of gas X in bottle = 64.867 – 64.531 g = 0.336 g 0.5 litres of gas has a mass of 0.336g So 1mole, 23.8 litres has a mass of 23.8/0.5 x 0.336 g = 15.99 g Higher Grade Chemistry

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