Question

The mass of a gas at a stp is found to be 0.6862g calculate molecular mass of gas

Answer 1

at STP 1mole gas= 22.4 litre volume

so,

22.4litre= 22400ml --:--1mole

1ml--:--1/22400 mole

so,

216.5--:--216.5/22400mole

now,

216.5/22400mole=.6862g

1mole= .6862×22400/216.5

1mole = 71g