How much water can be heated from 10 ° C to 60 ° C with full energy consumption from burning 50 g of alcohol? The specific heat of combustion of alcohol is 26 MJ / kg; the specific heat of water is 4200 J / kg ° C.
Let’s calculate the amount of heat that will be released during the complete combustion of alcohol:
26 MJ / kg = 26,000,000 J / kg;
50 g = 0.05 kg;
Q = Qcombustion (alcohol) * m (alcohol) = 26,000,000 * 0.05 = 1,300,000 J;
Let’s calculate the mass of water that can be heated with this amount of heat:
ΔТ = Т2 – Т1 = 60 – 10 = 50 ° С;
m (H2O) = Q / (Sud (H2O) * ΔT) = 1,300,000 / (4200 * 50) = 6.19 kg.
Answer: m (H2O) = 6.19 kg.
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