4.4g of a gas at STP (0∘C) occupies a volume of 2.73L At STP, 1 mole of any gas occupies a volume of 24.4L. 4.4g of a gas at STP occupies a volume of 2.73L. Hence, the number of moles of gas =
22.4
2.73
=0.1mol 0.1 mole of a gas =4.4g 1 mole of a gas =4.4×
1
0.1
=44g Thus, the molecular weight of gas is 44g∕mol. It is the molecular weight of CO2 gas. Hence, correct option is (d).