Using the following equation for the combustion of octane, calculate the heat associated combustion of 100.0 g of octane assuming complete c

Question

Using the following equation for the combustion of octane, calculate the heat associated combustion of 100.0 g of octane assuming complete combustion. The molar mass of octane is 114.33 g/mole. The molar mass of oxygen is 31.9988 g/mole.2C8H18+25O2→16CO2+18H2O;ΔH∘rxn = -11018 kJA. -11018 kJB. -4819 kJC. -602.3 kJD. -535.4 kJE. -385.5 kJ

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bonexptip 4 years 2021-08-09T01:26:23+00:00 1 Answers 225 views 0

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  1. Dau
    0
    2021-08-09T01:28:03+00:00
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    Answer:

    Option B. -4819 kJ

    Explanation:

    Equation of reaction:

    2C_{8} H_{18} + 25O_{2} \rightarrow 16CO_{2} + 18 H_{2} O          ΔH_{rxn} ^{0} = -11018 kJ

    Mass of octane, m = 100.0 g

    Molar mass of octane, MM = 114.33 g/mol

    Number of mole, n = Mass/ Molar mass

    Number of mole of octane, n = m/MM

    n = 100/114.33

    n = 0.8746 mols

    From the chemical equation above

    2 mols of octane produced -11018 kJ of heat

    1 mol of octane produces (-11018/2) kJ of heat = -5509 kJ oh heat

    Therefore, o.875 mols of octane will produce (-5509 * 0.8746) kJ oh heat = -4819 kJ of heat.

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