A certain gas occupies 0.418 litres at 27^@C and 740 mm Hg. If the same gas weighs 3.00 g, what is its molecular weight?

A certain gas occupies 0.418 litres at 27^@C and 740 mm Hg. If the sa

1.	A certain gas occupies 0.418 litres at 27^@C and 740 mm Hg. If the same gas weighs 3.00 g, what is its molecular weight?
Answer» Solution :Number of MOLES in 3.00 g of gas = `(3.00)/M`, where M is the molecular WEIGHT of the gas. According to the gas equation `PV = nRT` SUBSTITUTING the values, we have `740/760 XX 0.418 = 3.00/M xx 0.0821 xx 300` (P = 760/760 atm ) `:. ""M = 181.5`