The mass of 5.6 dm cube of a certain gas at STP is 12.0 g. Calculate the relative molecular mass of the gas.

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Solution

Mass of gas = 12 g
Volume of 12 g of gas at STP =5.6 L

22.4 L of gas at STP =1 mole
5.6 L of gas at STP =5.622.4moles =0.25 moles

mass of 0.25 moles of gas =12 g
Mass of 1 mole of gas or molar mass =12/0.25 = 48 g/mol
Relative molecular mass of gas =48 u

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The mass of 5.6 dm cube of a certain gas at STP is 12.0 g. Calculate the relative molecular mass of the gas.

Mass of gas = 12 g Volume of 12 g of gas at STP =5.6 L 22.4 L of gas at STP =1 mole 5.6 L of gas at STP =5.622.4moles =0.25 moles mass of 0.25 moles of gas =12 g Mass of 1 mole of gas or molar mass =12/0.25 = 48 g/mol Relative molecular mass of gas =48 u

Mass of gas = 12 g
Volume of 12 g of gas at STP =5.6 L

22.4 L of gas at STP =1 mole
5.6 L of gas at STP =5.622.4moles =0.25 moles

mass of 0.25 moles of gas =12 g
Mass of 1 mole of gas or molar mass =12/0.25 = 48 g/mol
Relative molecular mass of gas =48 u