Question

What is the quantity of heat evolved when 6 g carbon combines with sulfur to form CS₂ according to the reaction: \[ \text{C} + \text{S}_2 \rightarrow \text{CS}_2, \Delta H = -92 \, \text{KJ/mol} \]

• A. 22 KJ
• B. 32 KJ
• C. 46 KJ
• D. 11 KJ

Hint:

To calculate the heat evolved, multiply the moles of carbon by the enthalpy change (\( \Delta H \)) of the reaction.

Answer 1

The Correct Option is C

Step 1: Calculate the number of moles of carbon.
The molar mass of carbon is 12 g/mol, so 6 g of carbon is: \[ \text{Moles of carbon} = \frac{6}{12} = 0.5 \, \text{mol} \] Step 2: Calculate the heat evolved.
From the given reaction, 1 mole of carbon releases 92 KJ. Therefore, 0.5 moles of carbon will release: \[ \text{Heat} = 0.5 \times 92 = 46 \, \text{KJ} \] Step 3: Conclusion.
The correct answer is (C) 46 KJ.