# Chemistry

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A sample of natural gas is 80.0% CH4 and 20.0% C2H6 by mass. What is the heat from the combustion of 1.00 g of this mixture? Assume the products are CO2 and H2O.

How do I do this

• Chemistry -

You will need to know delta H for the combusion of CH4 and delta H for the combustion of C2H6. Then take 80% of 1 g for methane and 20% of 1 g for ethane and calculate delta H for each of the gases. Then add them together.

• Chemistry -

so CH4 = -74.87
and C2H6 = -84.68

what do you mean by take 80% and 20%???

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