sctenk6052
27.03.2020 •
Chemistry
25. To separate benzene from water, a 850 g aqueous solution of benzene is cooled from
95°C to 3°C, where it is then strained from the water as a solid. How many kilojoules of
heat energy are released by the cooling benzene?
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Ответ:
132.94 kilo joules
Explanation:
We are given;
Mass of benzene solution is 850 g Temperature change from 95°C to 3° C = 92° C or 92 KWe are required to determine the energy released by the cooling of benzene.
Taking the specific heat capacity of liquid benzene as 1.7 kJ/kg/K
Then we can determine the amount of heat energy released by using the formula;
Heat = Mass × specific heat × change in temperature
= 0.85 kg × 1.7 kJ/kg/K × 92 K
= 132.94 kilo joules
Therefore, the heat released by cooling benzene is 132.94 kilo joules
Ответ:
O O2(g) as a product
Explanation:
it is because oxygen is a gas and it must be given off in form of combustion