How much energy was released during the crystallization of 350 g of oxygen, if it was taken at the melting temperature?

To calculate how much heat will be released as a result of crystallization of liquefied oxygen, with a mass of m = 350 g = 0.35 kg, taken at a crystallization (melting) temperature t = – 218.7 ºС, we use the formula Q = λ • m, where λ = 13.8 kJ / kg = 13800 J / kg is the specific heat of crystallization (melting) of oxygen. It is taken from reference tables. Let’s substitute the values ​​of physical quantities into the formula and make calculations: Q = 0.35 kg • 13800 J / kg; Q = 4830 J. Answer: as a result of crystallization of a given mass of oxygen taken at the melting temperature, an amount of heat Q = 4830 J.