Using the table, calculate the heat change, in joules, needed to condense 5.5 g

Question

Using the table, calculate the heat change, in joules, needed to condense 5.5 g of steam at the condensation point.

Using the table, calculate the heat change, in kilojoules, needed to condense 77.0 g of acetic acid at the condensation point.

Using the table, calculate the heat change, in joules, needed to vaporize 50.0 g of ammonia at the boiling point.

Using the table, calculate the heat change, in kilojoules, needed to vaporize 3.0 kg of water at the boiling point.

Substance

Substance

Heat of vaporization (J/g) Propane, C3H8 336 Benzene, C6H6 395 Acetic acid, C2H4O2 390 Ethanol, C2H6O 841 Ammonia, NH3 1380 Water, H2O 2260 Sodium chloride, NaCl 13000

Explanation / Answer

a) Condensation point is at vapourization point only. so heat change for 5.5g of steam to water = 5.5*(-2260) J = -12430 J

b) Similarly for Acetic acid heat change in KJ for 77g of acetic acid = 77*(-390) J = -30.03 kJ

c) Heat change for vapourization for 50g ammonia in Joules = 50*1380 = 69000 J

d) Heat change for vapourizing 3 Kg or 3000 g water = 3000*2260 = 6780 kJ

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