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Ashish
Ashish asked in Science & MathematicsChemistry · 1 decade ago

Help with thermo chemical equation?

Given the following thermochemical equation:

2C6H6+15O2=>12CO2+6H2O q= -4970KJ

What is the heat change in KJ accompanying the reaction of 0.997moles of C6H6?

I got -2477.545, but don't know how. I know you are supposed to use dimensional analysis, but can someone explain what is the format on this problem?

Thanks

Update:

Thanks, Although that was the correct answer, it was a different format, I figured out how to do it using that format.

Thanks

1 Answer

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  • mazeton
    Lv 4
    1 decade ago
    Favorite Answer

    Just multiply (-4970) times (0.997 / 2) = -2477.545

    If two moles of C6H6 generate 4970 Kj, 0.997 moles of C6H6 generate only 2477.545 Kj

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