Question

Assume that coal is made entirely of carbon and has a density of 1.5 g/mL. How...

Assume that coal is made entirely of carbon and has a density of 1.5 g/mL. How much heat is produced if a piece of coal 7.0 cm x 5.0 cm x 6.0 cm undergoes a complete combustion reaction? The reaction has ΔH = -394 kJ/mol.

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Answer #1

volume of the carbon = 7.0 cm x 5.0 cm x 6.0 cm

                                  = 210 cm3

                                  = 210 mL

and therefore mass of carbon = 210 ml x 1.5 g/ml = 315 grams

moles of carbon = 315 grams / 12 g/mol

                          = 26.25 mol

heat produced = 394 kJ/mol x 26.25 mol = 10342.5 kJ = 1.034 x 10^7 J

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