# Make a thermochemical equation for the combustion of coal (carbon), if it is known

Make a thermochemical equation for the combustion of coal (carbon), if it is known that the combustion of 60 g of carbon released 1967.5 kJ of heat

Given:
m (C) = 60 g
Q1 = 1967.5 kJ

Find:
Thermochemical equation -?

Solution:
1) Using the periodic system of D.I.Mendeleev, calculate the molar mass of carbon:
M (C) = Mr (C) = Ar (C) = 12 g / mol;
2) Calculate the amount of carbon substance:
n (C) = m (C) / M (C) = 60/12 = 5 mol;
3) Make up the proportion and calculate the amount of heat:
5 mol C – 1967.5 kJ;
1 mol C – Q kJ;
Q = 1 * 1967.5 / 5 = 393.5 kJ;
4) Write the equation of the thermochemical reaction:
C + O2 => CO2 + 393.5 kJ.

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