Question

a sample of ethanol (c₂h₆o) has a mass of 0.2301 g. complete combustion of this sample causes the temperature of a bomb calorimeter to increase by 1.33°c. the calorimeter has a mass of 2.000 kg and a specific heat of 2.45 j/g·°c.
what is the heat of combustion for this sample?

kj
done

Explanation:

Step1: Convert the mass of calorimeter to grams

Since \(1\ kg = 1000\ g\), then \(m = 2.000\ kg=2.000\times1000\ g = 2000\ g\)

Step2: Use the heat - transfer formula \(Q = mc\Delta T\)

Here, \(m = 2000\ g\), \(c=2.45\ J/g\cdot^{\circ}C\), \(\Delta T = 1.33^{\circ}C\)

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Step3: Convert joules to kilojoules

Since \(1\ kJ=1000\ J\), then \(Q=\frac{6517\ J}{1000}=6.517\ kJ\)

Answer:

\(6.52\ kJ\)