Question

Density of gas at 300K band 210 torr gl what is the molar mass ?

Answer 1

Answer:

Density of the gas at 300 K and 210 torr pressure means, the Mass of 1- litre of gas at 300 K and 210 mm of Mercury pressure = 0.434 g

So Volume ofgas (0.434 g )at 760 mm pressure and 273 K

We know P°V°/T°= P¹V¹/T¹

So V°= P¹V¹/T¹ x (T°/P°)

= 1 x (273/300) x (210/760) = 0.2514 L

Therefore 0.2514- litres of a gas at STP weighs= 0.434 g

Molecular Mass is the mass of 22.4- litres of a gas at STP.

So Molecular Mass of the gas = 22.4/0.2514 x 0.434 = 38.67 g