SATHEE: Chemical Thermodynamics Question 304

Chemical Thermodynamics Question 304

Question: The heat of combustion of carbon to $C O_{2}$ is $- 393.5, k J / m o l$ . The heat released upon formation of 35.2 g of $C O_{2}$ from carbon and oxygen gas is [UPSEAT 2004]

Options:

A) $+, 315, k J$

B) $-, 31.5, k J$

C) $- 315, k J$

D) $+ 31.5, k J$

Show Answer

Answer:

Correct Answer: C

Solution:

$C + O_{2} \to C O_{2} Δ H = - 393.5, K J / m o l$

$∵$ $44, g m$ of $C O_{2}$ form by which heat released $= - 393., 5, k J$

$∴$ $1 g m$ of $C O_{2}$ form by which heat released $= - \frac{393.5}{44}$

$∴$ $35.2, g m$ (given) of $C O_{2}$ form by which heat released $= - \frac{393.5}{44} \times 35.2$

$= - 315, k J$

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Chemical Thermodynamics Question 304

Question: The heat of combustion of carbon to CO2 is −393.5,kJ/mol . The heat released upon formation of 35.2 g of CO2 from carbon and oxygen gas is [UPSEAT 2004]

Options:

Answer:

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Question: The heat of combustion of carbon to $C O_{2}$ is $- 393.5, k J / m o l$ . The heat released upon formation of 35.2 g of $C O_{2}$ from carbon and oxygen gas is [UPSEAT 2004]