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12 September, 22:47

The specific heat capacity of rubidium is 0.360 J/g°C. A sample of rubidium absorbs 40.0 kJ

when heated from 12.5 °C to 38.0 °C. Calculate the mass of the rubidium sample.

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  1. 13 September, 01:17
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    4.36 kg rubidium.

    Explanation: Quantity of heat is calculated by multiplying the mass of substance by the specific heat capacity and the change in temperature.

    That is; Q = mcΔT

    We are given;

    Quantity of heat = 40.0 kJ or 40,000 Joules

    Mass of rubidium = 0.360 J/g°C

    Change in temperature, ΔT = 38.0°C - 12.5°C

    = 25.5°C

    We are required to calculate the mass of rubidium

    From the formula; Q = mcΔT

    mass = Q : cΔT

    = 40,000 : (0.360 J/g°C * 25.5°C)

    = 4,357.30 g

    = 4.36 kg

    Therefore, the mass of 4.36 kg rubidium.
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