Chemistry Test ...

Identify the correct statement regarding a spontaneous process.

A mono-atomic ideal gas undergoes a process in which the ratio of P to V at any instant is constant and is equal to 1. What is the molar heat capacity of the gas?

The species which by definition has zero standard molar enthalpy of formation at 298 K is

2 mol of an ideal gas expanded isothermally and reversibly from 1 litre to 10 litres at 300 K. What is the enthalpy change?

The internal energy change in the conversion of 2.0 moles of calcite form of CaCO₃ to the aragonite form is 0.4 kJ. Calculate the enthalpy change when the pressure is 1 bar. Given that the densities of solids are 2.7gcm⁻³ and 2.9gcm⁻³ respectively.

Identify the correct statement regarding a spontaneous process.

One mole of non-ideal gas undergoes a change of state (1.0 atm, 3.0 L, 200 K) to (4.0 atm, 5.0 L, 250 K) with a change in internal energy ΔU = 40 L-atm. The change in enthalpy of the process in L-atm is :

A sample of oxygen gas expands its volume from 3 L to 5 L against a constant pressure of 3 atm. If work done during expansion is used to heat 10 mole of water initially present at 290 K, its final temperature will be (specific heat capacity of water = 4.18 J/kg):

A system absorbs 300 cal of heat, its volume doubles and temperature rises from 273 to 298 k, the work done on the surrounding is 200 cal. ΔE for the above reaction is :

Certain amount of a gas confined in a piston-filled cylinder is heated from 27⁰C to 127⁰C keeping its pressure constant and the gas expanded against a constant pressure doing 4.157 kJ of work on surroundings. Find the number of moles of gas present in the cylinder ?