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Coal and Its Fomation

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under the same conditions heat of formation of water and CO2 are -285, -394 kj /mol the heat of combustion of methane is -890 kj /mol the heat of formation of methane i

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Q. What will be the heat formation of methane; if the heat of combustion of carbon is '

- x

k J

, heat of formation of water is '

- y

k J

and heat of combustion of methane is '

- z

k J

?

Q. What wiII be the heat of formation of methane, if the heat of combustion of carbon is

^{'} - x^{'} k J

, heat of formation of water is

^{'} - y^{'} k J

and heat of combustion of methane is

^{'} z^{'} k J

?

Q. Calculate the heat of formation of methane, given that
heat of formation of water

= - 286 k J {m o l}^{- 1}

heat of combustion of methane

= - 890 k J {m o l}^{- 1}

heat of combustion of carbon

= - 393.5 k J {m o l}^{- 1}

Q. On complete combustion of

2 g

26575 C a l

heat is generated. The heat of formation of methane will be (given heat of formation of

C O_{2}

H_{2} O

- 97000

- 68000 C a l

Q. What will be the amount of heat evolved by burning 10 L of methane under standard conditions?
(Given heats of formation of

C H_{4}, C O_{2}

H_{2} O

are -76.2, -398.8 and -241.6 kJ

m o l^{- 1}

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