Question

the heat of combustion of ethane (C2H6) is -337.0kcal at 25°C.The heat of the reaction when 3g of ethane is burnt completely. is? a.-3.37kcal b.+3.37kcal c.-33.7kcal d.+33.7kcal.Which is the correct answer?​

Answer 1

Explanation:

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Answer 2

Concept:

• Thermochemistry
• Calculating the heat of combustion
• Calculating the heat of a reaction
• Understanding the mole concept

Given:

• The heat of combustion ΔHc = -337 kcal
• The temperature = 25°C
• The reaction of combustion is C₂H₆ + 7/2O₂ ---> 3H₂O + 2CO₂

Find:

• The heat of the reaction when 3 g of ethane is burnt completely

Solution:

The balanced combustion reaction is C₂H₆ + 7/2O₂ ---> 3H₂O + 2CO₂

When one mole of ethane is burnt, the heat of the reaction is -337 kcal

Depending on the number of moles of ethane burnt, the heat of the reaction varies.

Number of moles of ethane = given weight/molar mass

molar mass of ethane = 2(12)+6(1) = 30 g

number of moles of ethane = 3/30 = 0.1 mole

Since 0.1 moles of ethane is burnt, the heat of the reaction is -337/10 = -33.7 kcal

The heat of the reaction is -33.7 kcal.

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