Question

The thermal energy produced by an electric heater in three minutes is used to melt wax. The wax
is initially at its melting point of 60 °C.
The specific latent heat of the wax is 220J/g. The heater supplies 7700 J of thermal energy to the
wax.
How much wax melts?

Answer 1

Answer:

m = 35 g = 0.035 kg

Explanation:

The amount of heat required by a specific mass of wax to be melted at its melting point can be given by the following formula:

Q = mLQ=mL

where,

Q = Heat Supplied by the Heater = 7700 J

m = mass of wax melted = ?

L = Latent Heat of Fusion of Wax = 220 J/g

Therefore,

\begin{gathered}7700\ J = m(220\ J/g)\\m = \frac{7700\ J}{220\ J/g}\\\\\end{gathered}7700 J=m(220 J/g)m=220 J/g7700 J

m = 35 g = 0.035 kg

Answer 2

Answer:

m =35.

Explanation:

The thermal energy produced by an electric heater in three minutes is used to melt wax. The wax

is initially at its melting point of 60 °C.

The specific latent heat of the wax is 220J/g. The heater supplies 7700 J of thermal energy to the

wax.

How much wax melts?