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22 August, 09:17

Problem 4

Calculate the mass of ethane, C2H6, which must be burned to produce 100 kJ of heat.

2 CzH6 (9) + 7 02 (9) - --> 4CO2 (g) + 6 H2O (1) AH = - 3120 kJ

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  1. 22 August, 09:36
    0
    1.93 g

    Explanation:

    We are given;

    The chemical equation;

    2C₂H₆ (g) + 7O₂ (g) → 4CO₂ (g) + 6H₂O (l) ΔH = - 3120 kJ

    We are required to calculate the mass of ethane that would produce 100 kJ of heat.

    From the equation given; 2 moles of ethane burns to produce 3120 Kilo joules of heat Therefore;

    Number of moles that will produce 100 kJ will be;

    = (2 * 100 kJ) : 3120 kJ)

    = 0.0641 moles

    But, molar mass of ethane is 30.07 g/mol

    Therefore;

    Mass of ethane = 0.0641 moles * 30.07 g/mol

    = 1.927 g

    = 1.93 g

    Thus, the mass of ethane that would produce 100 kJ of heat is 1.93 g
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