Question

Calculate the amount of heat needed to raise 190.0 g of water vapor at 118 C to 150. C

Answer 1

12,281.6 Joules

Step-by-step explanation:

• The amount of heat energy is calculated by multiplying the mass of a substance by its specific heat capacity and then by the change in temperature.

• That is, Q = m × c ×Δt

In our case;

Mass of water vapor, m = 190.0 g

Change in temperature, Δt = 150°C - 118°C = 32°C

Taking the specific heat capacity of water vapor = 2.02 J/g°C

Therefore;

Amount of heat = 190.0 g × 2.02 J/g°C × 32°C

= 12,281.6 Joules

Hence, the amount of heat needed is 12,281.6 Joules