Question

PLEASE HELP ME WITH THIS CHEM WORK!!!

Answer 1

1. Q = 112.8 kJ

2. Q = 5.01 kJ

Further explanation

The heat to change the phase can be formulated :

Q = mLf (melting/freezing)

Q = mLv (vaporization/condensation)

Lf=latent heat of fusion

Lv=latent heat of vaporization

1. m=50 g=0.05 kg

Lv for water = 2256 kJ/kg

$\tt Q=m.L_v\\\\Q=0.05\times 2256\\\\Q=\boxed{\bold{112.8~kJ}}$

2. m=15 g=0.015 kg

Lf for water = 334 kj/kg

$\tt Q=m.L_f\\\\Q=0.015\times 334\\\\Q=\boxed{\bold{5.01~kJ}}$