In which of the following processes is (delta)H = (delta)E?Why?

(a) Two moles of ammonia gas are cooled from 325 C to 300 C at1.2atm

(b) One gram of water is vaporized at 100C and 1 atm.

(c) A mole of nitrogen gas reacts with a mole of oxygen gas toform two moles of nitric oxide gas in a 40L container.

(d) Calcium carbonte is heated to form calcium oxide and carbondioxide in a container with variable volume.

(e) One mole of solid carbon dixide sublimes to the gasphase.