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24 September, 09:58

If a pork roast must absorb

1700kJ

to fully cook, and if only

11%

of the heat produced by the barbeque is actually absorbed by the roast, what mass of

CO

2

is emitted into the atmosphere during the grilling of the pork roast?

+4
Answers (1)
  1. 24 September, 12:35
    0
    Let us assume propane was the fuel

    C3H8 (g) + 5O2 (g) - - - > 3CO2 (g) + 4H2O (g) = 2217kJ

    1 mole ofpropane produces 3 moles of CO2

    heat absorbed by pork = 0.11 x 2217

    = 243.87 kJ/mol

    number of moles of propane = 1700kJ / 243.87 kJ/mol

    = 6.971 moles

    1 mole of C3H8 = 3 moles ofCO2

    6.971 moles of C3H8 = ?

    3 x 6.971 = 20.913 moles of CO2

    Convert to grams

    mass = MW x mole

    = 44 x 20.913

    = 920.172g of CO2 emitted
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