SATHEE: Chemical Thermodynamics Question 474

Chemical Thermodynamics Question 474

Question: The standard heat of combustion of Al is $-, 837.8, k J, m o l^{- 1}$ at $25^{o} C$ . If Al reacts with $O_{2}$ at $25^{o} C,$ which of the following releases 250 kcal of heat-

Options:

A) The reaction of 0.624 mole of Al

B) The formation of 0.624 mole of $A l_{2} O_{3}$

C) The reaction of 0.312 mole of Al

D) The formation of 0.150 mole of $A l_{2} O_{3}$

Show Answer

Answer:

Correct Answer: B

Solution:

$2, A l + \frac{3}{2} O_{2} \overset{}{\to} A l_{2} O_{3};$

$Δ H^{o} = -, 837.8, k J, m o l^{- 1}$

2 mol 1.5 mol 1 mol 1 mol 0.75 mol 0.5 mol $837.8, k J, m o l^{- 1} \equiv$ Combustion of 1 mole Al or formation of 0.5 mole $A l_{2} O_{3}$

$250, k c a l = \frac{250 \times 8.314}{2}, k J$

$= 1.24, m o l, A l$

or $= 0.62, m o l$ of $A l_{2} O_{3}$

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Chemical Thermodynamics Question 474

Question: The standard heat of combustion of Al is −,837.8,kJ,mol−1 at 25oC . If Al reacts with O2 at 25oC, which of the following releases 250 kcal of heat-

Options:

Answer:

Solution:

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Question: The standard heat of combustion of Al is $-, 837.8, k J, m o l^{- 1}$ at $25^{o} C$ . If Al reacts with $O_{2}$ at $25^{o} C,$ which of the following releases 250 kcal of heat-