Chemistry-Enthalpy
NEET Chemistry Enthalpy MCQ Question
Type: MCQ-numerical-Medium-Class 11
Given the enthalpy of combustion of carbon to CO₂ is -393.5 kJ mol⁻¹, calculate the heat released upon formation of 35.2 g of CO₂ from carbon and dioxygen gas.
A
-315.6 kJ
B
-393.5 kJ
C
-704.5 kJ
D
-157.6 kJ
Correct Answer
Option A
Detailed Explanation
The molar mass of CO₂ is 44 g mol⁻¹. The number of moles of CO₂ formed from 35.2 g is 35.2 g / 44 g mol⁻¹ = 0.8 mol. Therefore, the heat released is 0.8 mol × (-393.5 kJ mol⁻¹) = -315.6 kJ.
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