1.35 understand how to carry out calculations involving gas volumes and the molar volume of gas
At standard temperature and pressure, one mole of any gas will occupy 24000 cm3; also known as 24dm3.
Calculate the molar volume of oxygen, under these conditions.
Volume = mass x no. of moles
Mass of oxygen, O2, = 32.0 g.
Volume of 1 g = 976 ÷ 1.3
Hence, 32 g = (976 ÷ 1.3) × 32 = 24024 cm3
Answer: 24.0 is the volume of 32.0 g of O2.
Calculating molar volume from mass
Example:
976 cm3 of oxygen was found to have a mass of 1.3 gCalculate the molar volume of oxygen, under these conditions.
Volume = mass x no. of moles
Mass of oxygen, O2, = 32.0 g.
Volume of 1 g = 976 ÷ 1.3
Hence, 32 g = (976 ÷ 1.3) × 32 = 24024 cm3
Answer: 24.0 is the volume of 32.0 g of O2.
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