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9 November, 18:33

It takes 11.2 kj of energy to raise the temperature of 145 g of benzene from 22.0°c to 67.0°c. what is the specific heat of benzene? it takes 11.2 kj of energy to raise the temperature of 145 g of benzene from 22.0°c to 67.0°c. what is the specific heat of benzene? 5.18 j / (g * °c) 3.48 j / (g * °c) 1.15 j / (g * °c) 1.72 j / (g * °c)

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  1. 9 November, 19:32
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    We can use the heat equation,

    Q = mcΔT

    where Q is the amount of energy transferred (J), m is the mass of the substance (kg), c is the specific heat (J g⁻¹ °C⁻¹) and ΔT is the temperature difference (°C).

    Q = 11.2 kJ = 11200 J

    m = 145 g

    c = ?

    ΔT = (67 - 22) °C = 45 °C

    By applying the formula,

    11200 J = 145 g x c x 45 °C

    c = 1.72 J g⁻¹ °C⁻¹

    Hence, specific heat of benzene is 1.72 J g⁻¹ °C⁻¹.
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