# First Year Chemistry Gases

Change the way you learn with Maqsad's classes. Local examples, engaging animations, and instant video solutions keep you on your toes and make learning fun like never before!

$(b) Compare the rates of diffusion of the following pairs of gases:(i) H_{2} and D_{0} :$

$Q15 Explain the following facts(iv) Water vapours do not behave ideally at 273 \mathrm{~K} .$

$Q8. Derive the units for gas constant R in general gas cquation: when energy is expressed in ergs.$

$Fill in the blanks.(i). The product PV has the S.I. unit of(ii). Eight grams each of \mathrm{O}_{2} and \mathrm{H}_{2} at 27^{\circ} \mathrm{C} will have total \mathrm{K} . \mathrm{E} in the ratio of(iii). Smell of the cooking gas during leakage from a gas cylinder is due to the property of of gases.(iv). Equal of ideal gases at the same temperature and pressure contain number of molecules.(v). The temperature above which a substance exists only as a gas is called$

$7. 1.40 \mathrm{dm}^{3} volume of a gas measured at a temperature of 27^{\circ} \mathrm{C} and a pressure of 900 torr was found to have mass 2.273 \mathrm{~g} . Calculate the molecular mass of the gas [Hint: Calculate " n " by the formula PV=nRT and then molecular mass] (33.72 amu) Ans.$

$Q21.a. The relative densities of two gases \mathrm{A} and \mathrm{B} are 1: 1.5 . Find out the volume of B which will diffuse in the same time in which 150 \mathrm{dm}^{3} of A will diffuse?$