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Chemistry

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Given the reaction: Ni (s) + 4 CO (g)  Ni(CO)4 (g) E = –154 kJ, how many kilograms
of CO are required for this reaction to release 756 kJ of energy?

  • Chemistry -

    Ni (s) + 4 CO (g)  Ni(CO)4 (g) E = –154 kJ

    4*molar mass CO x (756/154)

  • Chemistry -

    hi. can you explain to me please why this solution please? THANK YOU

  • Chemistry -

    Ni (s) + 4 CO (g)  Ni(CO)4 (g) E = –154 kJ

    1 mol CO = 12+16 = 28 g
    4 mol CO = 4*28 = 112 g

    112 g CO produces 154 kJ heat. You want 756 kJ. You know that will take more than 112 g so the ratio is 756/154 and
    112 x (756/154) = ?

    OR you can do it by proportion.
    (112g/154 kJ) = (x/756) and
    x = 112*756/154.

    Ask yourself this question. If the rxn produces 154 kJ for 112 g CO, then how many g CO would be need to produce just twice as much heat (that's 154*2 = 308). The answer is obvious. If you want twice the heat you will need twice the fuel. How did you get that answer? By 112 x (308/154) = 112*2 = 224g CO

    Or how much CO is needed to produce 3x as much heat. Of course the answer is 3x the amount of fuel. How do you get that?(3*154=462)
    112 x (462/154) = 336 (or 3*112).

    Therefore, if you don't want twice the amount or 3x the amount but you want 756 kJ, you will need 112g x (756 kJ/154 kJ) = ?g

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