What amount of heat is required to turn 100 g of ether into steam, which has a temperature of 5 ° C?

Given: m (mass of ether for transition to vapor) = 100 g (0.1 kg); t0 (ether temperature before heating) = 5 ºС.

Constants: С (specific heat of ether) = 2350 J / (kg * ºС); tpap (temperature of the beginning of vaporization) = 35 ºС; L (specific heat of vaporization) = 4 * 10 ^ 5 J / kg.

1) Heating the ether: Q1 = C * m * (tpap – t0) = 2350 * 0.1 * (35 – 5) = 7050 J.

2) Conversion of ether to steam: Q2 = L * m = 4 * 10 ^ 5 * 0.1 = 4 * 10 ^ 4 J.

3) Required heat: Q = Q1 + Q2 = 7050 + 4 * 10 ^ 4 = 47050 J.

Answer: 47,050 J.