Place the following systems in order of increasing randomnes:
a. `1mol` of a gas `X` b. `1mol` of a solid `X`
c. `1 mol` of a liquid `X`

Write down the thermochemical equations for the following reactions: (i) A 1 mol sample of methane gas reacts with 2 mol of oxygen gas to form 1 mol of carbon dioxide and 2 mol of water. In this reaction, 890.5 kJ of heat is produced. (ii) A 1 mol sample of carbon (graphite) reacts with 1 mol of oxygen tof orm 1 mol fo carbon dioxide gas. the heat evolved in this reaction is 393.5 kJ. (iii) 6 mol of carbon dioxide gas reacts with 6 mol of water to form 6 mol of oxygen gas and 1 mol of glucose. the heat absorbed in this reaction is 2200 kJ.

How muCHM CHMarge is required for the following reductions : a. 1 mol of Al^(3+) to Al b. 1 mol of Cu^(2+) to Cu c. 1 mol of MnO_(4)^(c-) to Mn^(2+)?

If water vapour is assumed to be a perfect gas, molar enthalpy change for vapouration of 1 mole of water at 1 bar and 100^(@)C is 41 kJ mol^(-1) . Calculate the internal energy change when a) 1 mol of water is vapourised at 1 bar and 100^(@)C b) 1 mol of water liquid is converted into ice.

If water vapour is assumed to be a perfect gas, molar enthalpy change for vaporisation of 1 mol of water at 1 bar and 100^(@)C is 41 kJ mol^(-1) .Calculate the internal energy change, when (a) 1 mol of water is vaporised at 1 bar pressure and 100^(@) C. (b) 1 mol of water is converted into ice.

An element A (atomic weight = 12) and B (atomic weight = 35.5) combines ot form a compound X . If 5 mol of B comibnes with 1 mol of A to give 1 mol of X . The weight of 1 mol of X would be