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Vlad1618 [11]
3 years ago
9

How much heat is released when 24.8 g of ch4 is burned in excess oxygen gas?

Chemistry
1 answer:
balu736 [363]3 years ago
4 0

The given question is incomplete. The complete question is:

How much heat is produced when 24.8 g of CH_4 is burned in excess oxygen gas

Given: CH _4
+2O_2\rightarrow CO_2+2H_2O  ΔH= −802 kJ.

Answer: 1243.1 kJ

Explanation:

Heat of combustion is the amount of heat released on complete combustion of 1 mole of substance.

Given :

Amount of heat released on combustion of  1 mole of methane = 802 kJ kJ/mol

According to avogadro's law, 1 mole of every substance occupies 22.4 L at NTP, weighs equal to the molecular mass and contains avogadro's number 6.023\times 10^{23} of particles.

1 mole of CH_4 weighs = 16 g  

Thus we can say:  

16 g of CH_4 on combustion releases heat = 802 kJ

Thus 24.8 g of CH_4 on combustion releases =\frac{802}{16}\times 24.8=1243.1kJ

Thus heat released when 24.8 g of methane is burned in excess oxygen gas is 1243.1 kJ

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Answer : The correct option is, (3) change states of matter.

Explanation :

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(2) Latent heat of vaporization

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Hence, latent heat is used to change states of matter.

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In fact, I found the set of options that comes with this questions. This is:

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With that you likely had been able to answer the question. But it is good to know what the molecular theory is.

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Answer:

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