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h asked in Science & MathematicsChemistry · 3 years ago

Chemistry Help?

For the reaction C(s) + O2(g) => CO2(g) ΔHorxn = -393 kJ

How many grams of C(s) must be reacted to release 275 kJ of heat?

Pls explain thanks! The answer is 8.40 g but how do you get that?

1 Answer

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  • Roger the Mole
    Lv 7
    3 years ago

    (275 kJ) / (393 kJ / mol C) x (12.01078 g C/mol) = 8.40 g C

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