Answer to Question #204329 in Classical Mechanics for Kate McClue

Question

1. Calculate what mass of water can be changed to steam if 10.6kJ of heat energy is supplied to the water at 100⁰C. (Specific latent heat of vaporization of water = 2.26x10⁶J/kg)

1. Ammonia is vaporised in order to freeze an ice rink.

a)  Find out how much heat it would take to vaporise 1 g of ammonia.

    (Specific latent heat of vaporisation of ammonia = 1.34 x 10⁶ J/kg      Specific latent heat of fusion of ice = 3.34 x 10⁵ J/kg).

Answer 1

1)

$Q=Lm,\implies m=\frac QL,$

$m=\frac{10.6\cdot 10^3}{2.26\cdot 10^6}=4.7~g,$

2)

$Q=Lm,$

$Q=1.34\cdot 10^6\cdot 1\cdot 10^{-3}=1.34~kJ$