Question

hujEnthalpy of combustion of carbon to CO2 is –393.5 kJ mol–1. Calculate the heat released upon formation of 35.2 g of CO2 from carbon and dioxygen gas.


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Answer 1

Heat of combustion for 1 mole of CO2 is −393.5KJ

Number of moles in 35.2g of CO2=4435.2=0.8mole

Thus heat of combustion for 0.8 mole of CO2 is −393.5×0.8=−315KJ

Answer 2

Explanation:

Earth's crust is the outermost layer. It can be classified into Continental crust and oceanic crust, on the basis of chemical composition. The continental crust is made up of silica and aluminium. Oceanic crust is made up of and magnesium