Question

In a calorimetry experiment 2.50 g of methane is burnt in excess oxygen. 30% of the energy released during the combustion is absorbed by 500 g of water, the temperature of which rises from 25°C to 68°C. The specific heat capacity of water is 4.184 J/g°C. What is the total energy released per gram of methane burnt?​

Answer 1

The total energy released per gram of methane burnt is  119,941.3 J/g.

Energy absorbed by water

Q = mcΔθ

where;

• m is mass of water
• c is specific heat of water
• Δθ is change in temperature

Q = (500)(4.184)(68 - 25)

Q = 89,956 J

Total energy released per gram of methane burnt

0.3T =  89,956 J

T =  89,956 J/0.3

T = 299,853.3 J

Total energy per gram of methane, E = T.E/m

E = (299,853.3 J) / (2.5 g)

E = 119,941.3 J/g

Thus, the total energy released per gram of methane burnt is  119,941.3 J/g.

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