3.49 g of ammonia at STP occupies volume of` 4.48 dm^3`. Calculate molar mass of ammonia

One mole of any occupies a volume of 22.4 dm^3 at_________.

A welding fuel gas contains carbon and hydrogen only. Burning a small sample of it in oxygen gives 3.38 g carbon dioxide, 0.690g of water and no other products. A volume of 10.0L (measured at STP) of this welding gas is found to weigh 11.7 g. Calculate molar mass of the gas

300 m mol of an ideal gas occupies 13.7 dm^3 at 300 K . Calculate the work done when the gas is expanded until its volume has increased by 2.3 dm^3 (a) isothermally against a constant external pressure of 0.3 bar (b) isothermally and reversibly (c) into vaccum.

The freezing point of a solution containing 4.8 g of a compound in 60 g of benzene is 4.48 ^(@) C . What is the molar mass of the compound ? (K_(f)=5.1 Km^(-1) , freezing point of benzene =5.5^(@)C )