5.23 Explain the physical significance of van der Waals parameters.
5.22 Critical temperature for carbon dioxide and methane are 31.1 °C and –81.9 °C respectively. Which of these has stronger intermolecular forces and why?
5.21 In terms of Charles’ law explain why –273 °C is the lowest possible temperature.
5.20 What would be the unit for the quantity ?
5.19 A mixture of dihydrogen and dioxygen at one bar pressure contains 20% by weight of dihydrogen. Calculate the partial pressure of dihydrogen.
5.18 2.9 g of a gas at 95 °C occupied the same volume as 0.184 g of dihydrogen at 17 °C, at the same pressure. What is the molar mass of the gas?
5.17 Calculate the volume occupied by 8.8 g of at 31.1°C and 1 bar pressure. .
5.16 Pay load is defined as the difference between the mass of displaced air and the mass of the balloon. Calculate the pay load when a balloon of radius 10 m, mass 100 kg is filled with helium at 1.66 bar at 27°C.
(Density of and ).
5.15 Calculate the total pressure in a mixture of 8 g of dioxygen and 4 g of dihydrogen confined in a vessel of at 27°C. .
5.14 How much time would it take to distribute one Avogadro number of wheat grains, if 1010 grains are distributed each second ?
5.13 Calculate the total number of electrons present in 1.4 g of dinitrogen gas.
5.12 Calculate the temperature of of a gas occupying at 3.32 bar.
5.11 A student forgot to add the reaction mixture to the round bottomed flask at 27 °C but instead he/she placed the flask on the flame. After a lapse of time, he realized his mistake, and using a pyrometer he found the temperature of the flask was 477 °C. What fraction of air would have been expelled out?
5.10 of phosphorus vapour weighs 0.0625 g at and 0.1 bar pressure. What is the molar mass of phosphorus?
5.9 Density of a gas is found to be at at 2 bar pressure. What will be its density at STP ?
5.8 What will be the pressure of the gaseous mixture when of at bar and of dioxygen at bar are introduced in a 1L vessel at ?
5.7 What will be the pressure exerted by a mixture of 3.2 g of methane and 4.4 g of carbon dioxide contained in a flask at ?
5.6 The drain cleaner, Drainex contains small bits of aluminum which react with caustic soda to produce dihydrogen. What volume of dihydrogen at 20 °C and one bar will be released when 0.15g of aluminum reacts?
5.5 Pressure of 1 g of an ideal gas A at is found to be 2 bar. When 2 g of another ideal gas B is introduced in the same flask at the same temperature the pressure becomes 3 bar. Find a relationship between their molecular masses.
5.4 At , the density of a certain oxide of a gas at 2 bar is same as that of dinitrogen at 5 bar. What is the molecular mass of the oxide?