Question

How much heat is produced by the complete combustion of 284 g of CH4? CH4+2O2=CO2+2H2O; H=-802.3kj

Answer 1

That's a hard one forsure

Answer 2

-14,240.8 kJ of heat is produced by the complete combustion of 284 grams of methane.

Step-by-step explanation:

`CH_4+2O_2\rightarrow CO_2+2H_2O,\Delta H=-802.3 kJ`

Mass of methane = 284 g

Moles of methane =
`(284 g)/(16 g/mol)=17.75 g/mol`

According to chemical reaction, combustion of 1 mole of methane gives 802 kilo Joules of heat , then 17.75 moles of methane of on combustion will give :

`17.75 * (-802.3 kJ)=-14,240.8 kJ`

-14,240.8 kJ of heat is produced by the complete combustion of 284 grams of methane.