Question

3. Burns from boiling water can be severe, caused by the transfer of energy from the boiling water to the

skin as the water cools to body temperature. How much heat (kJ) is transferred from the from 15.0g
of boiling water at 100.0°C as it hits the skin and cools to 37.2°C?

Answer 1

Q = 3937.56 J

Step-by-step explanation:

Heat transferred due to change in temperature is given by :

`Q=mc\Delta T`

c is the specific heat of water, c=4.18 J/g-°C

We have, m = 15 g,
`T_i=100^(\circ) C\ \text{and}\ T_f=37.2^(\circ) C`

So,

`Q=15* 4.18* (37.2-100)\\Q=-3937.56\ J`

Hence, 3937.56 J of heat is transferred.