Determine the amount of heat required to vaporize 8kg of ether taken at a temperature of 10° C

We start with a short notation of the problem statement:

Given:

t1 = 35 ° C (temperature of ether vapor circulation);

t2 = 10 ° C;

m = 8 kg;

с = 3 340 J / kg * ° С (specific heat of ether);

L = 4,000,000 J / kg.

Find:

Q -?

Solution:

To determine the amount of heat required to heat the ether, we use the formula:

Q1 = c * m * (t2 – t1);

When the ether turns into gas, energy is released:

Q2 = L * m;

The total energy is equal to:

Q3 = Q1 + Q2 = c * m * Δt + L * m = 3 340 * 8 * 25 + 400 000 * 8 = 3 868 000 J.

Answer: 3,868,000 J.