將軍澳 asked in 科學及數學數學 · 1 decade ago

chem F.6 THEROMOCHEMISTRY

WHAT IS THE FINAL TEMPERATURE OF 14.5G SAMPLE OF NICKEL WHEN COOLED FROM A STARTING TEMPERATURE OF 62.5度RELEASING355J OF ENERGY

LOOK UP THE Cp VALUE FOR NICKEL ON UR PERIODIC TABLE

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  • 1 decade ago
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    Let T be the final temperature of 14.5g sample of nickel.

    By E=mcΔT

    335=(14.5÷58.6934)×26.07×(62.5℃-T)

    T=10.5℃ (cor. to 3 sig. fig.)

    ∴The final temperature of 14.5g sample of nickel is 10.5℃.

    2009-03-27 19:46:51 補充:

    睇錯咗!

    Let T be the final temperature of 14.5g sample of nickel.

    By E=mcΔT

    355=(14.5÷58.6934)×26.07×(62.5℃-T)

    T=7.38℃ (cor. to 3 sig. fig.)

    ∴The final temperature of 14.5g sample of nickel is 7.38℃.

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