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31 January, 14:47

What is the enthalpy change (in kJ) of a chemical reaction that raises the temperature of 250.0 ml of solution having a density of 1.25 g/ml by 7.80°C? (The specific heat of the solution is 3.74 joules/gramK.) A. - 7.43 kJ

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  1. 31 January, 15:08
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    328.4KJ

    Explanation:

    Before we move on to calculate enthalpy change, we calculate the amount of heat Q

    Q = mcΔT

    m = density * volume = 250 * 1.25 = 312.5g

    c = 3.74J/g. k

    ΔT = 7.80 + 273.15K = 280.95K

    Q = 312.5 * 3.74 * 280.95 = 328,360.312 J = 328.4KJ (1000J = 1KJ, so divide by 1000)

    The enthalpy change in the reaction is same as amount of heat transferred = 328.4KJ
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