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Standard VIII

Chemistry

Energy Stored in Fossil Fuels

Which of the ...

Question

Which of the following represents data for hydrogen?

143 kJ/g

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33 kJ/g

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48 kJ/g

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23 kJ/g

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Solution

The correct option is A
143 kJ/g

Calorific value is the energy contained in a fuel or an object, which is determined by measuring the amount of heat produced by the complete combustion of a specified quantity of that fuel.

We know, the calorific value of hydrogen is highest so the heat produced by combustion of hydrogen will be maximum as compared to other fuels, So the fuel in the first bar which has the highest heat produced represents hydrogen.

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Q. The calorific values of fuels A, B, C and D are 48 KJ/g, 17 KJ/g, 50 KJ/g and 30 KJ/g respectively. Which of these fuels could be wood?

The calorific values of five fuels A, B, C, D and E are given below:
A 48 kJ/g
B 17 kJ/g
C 150 kJ/g
D 50kJ/g
E 30kJ/g
Which of the fuels could be: (i) cooking gas (ii) alcohol (iii) wood (iv) hydrogen (v) kerosene?

Q. The calorific values of five fuels A, B, C, D and E are given below:

A		48 kJ/g
B		17 kJ/g
C		150 kJ/g
D		50 kJ/g
E		30 kJ/g

Which of the fuels could be : (i) cooking gas (ii) alcohol (iii) wood (iv) hydrogen (v) kerosene?

Q. Use the following data to calculate second electron affinity of oxygen for the process

O^{-} (g) + e^{-} (g) \to O^{2 -} (g)

.
Heat of sublimation of

M g (s) = 147.7 k J / m o l

Ionisation energy of

M g (g)

to form

M g^{2 +} (g) = 2189 k J / m o l

Bond dissociation energy for

O_{2}

= 498.4 k J / m o l

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O (g) = - 141 k J / m o l

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M g O (s) = - 601.7 k J / m o l

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Q. Use the given bond enthalpy data to estimate the

Δ H (k J)

for the following reaction.

(C - H = 414 k J, H - C l = 431 k J, C l - C l = 243 k J, C - C l = 331 k J)

C H_{4} (g) + 4 {C l}_{2} (g) ⟶ C {C l}_{4} (g) + 4 H C l (g)

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