Question

2g of mass of a gas ocupies a volume of 10dm3 at STP. what is its molar mass ?​

Answer 1

Answer:

2g of a gas at STP occupies a volume of 2.24 L. The gas can be CO

2

At STP, 1 mole of any gas occupies a volume of 22.4 L.

4.4 g of a gas at STP occupies a volume of 2.24 L.

Hence, the number of moles of gas =

22.4

2.24

=0.1 moles.

0.1 moles of a gas = 4.4 g.

1 mole of a gas =4.4×

0.1

1

=44 g.

Thus, the molecular weight of gas is 44 g/mol. It is the molecular weight of CO

2

gas.