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

September 23, 2021 | education

| **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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