Question

Calculate the amount of heat (kcal) released when 50.0g of steam at 100 degrees celsius hits the skin, condenses and cools to a body temperature of 37 degrees celsius

Answer 1

`Q=-126.1kJ`

Step-by-step explanation:

Hello,

In this case, by means of the released heat, we need to consider the cooling of water in two steps:

1. Condensation of steam at 100 °C.

2. Cooling of water from 100 °C to 37 °C.

Therefore, we need the enthalpy of condensation of water that is 40.65 2258.33 J/g and the specific heat that is 4.18 J/g°C for the same amount of cooled water to obtain:

`Q=50.0g*[-2258.33(J)/(g)+4.18(J)/(g\°C)(37-100)\°C]\\\\Q=-126.1kJ`

Best regards.