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3 December, 06:53

The constant pressure molar heat capacity, C_{p, m}C p, m , of methane gas, CH_4CH 4 , is 35.31/text{ J K}^{-1}/text{ mol}^{-1}35.31 J K - 1 mol - 1 at temperatures close to 298/text{ K}298 K. Calculate the enthalpy change when 1.6/text{ kg}1.6 kg of methane gas is heated from a temperature of 280/text{ K}280 K to 320/text{ K}320 K.

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  1. 3 December, 08:06
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    Constant pressure molar heat capacity Cp = 35.3 J / mol

    Enthalpy change of the given process can be calculated as follows

    ΔH = n Cp x Δt, n is number of mole, Cp is molar heat capacity and Δt

    is change in temperature.ΔH is enthalpy change.

    Putting the values

    ΔH = n Cp x Δt

    mol weight of methane = 16

    1.6 kg = 1600 g

    = 1600 / 16

    = 100 moles

    n = 100

    Putting the values

    ΔH = n Cp x Δt

    = 100 x 35.3 x (320 - 280)

    = 141200 J

    = 141.2 KJ.
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