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  • 7/25/2019 Changing a heat capacity equation from one set of units to another is merely a problem in the conversion of units.docx

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    Changing a heat capacity equation from one set of units to another is merely

    a problem in the conversion of units. Each term in the heat capacity equation

    must have the same unit as the left-hand side of the equation. To avoid

    confusion in the conversion, you must remember to distinguish between the

    temperature symbol that represent temperature and the temperature symbol

    that represent temperature dierence even through the same symbol often

    is used for each concept. In the conversions below we shall distinguish

    between the temperature and the temperature dierence for clarity.

    irst, multiply each side of the given equation for Cp by appropriate

    conversion factors to convert !"#$g mol% #&$% to #'tu"lb mol #o%. (ultiply the

    left-hand side by the factors in the square brac)ets

    &n multiply right-hand side by the same set of the conversion factors.

    *e+t, substitute the relation between the temperature in $ and the

    temperature in .

    Into the given equation for Cp where T) appears.

    inally, carry out the indicated mathematical operations and consolidate

    quantities to get

    (engubah persamaan )apasitas panas dari satu set unit yang lain hanyalah

    masalah dalam )onversi unit. etiap istilah dalam persamaan )apasitas

    panas harus memili)i unit yang sama dengan sisi )iri dari persamaan. ntu)

    menghindari )ebingungan dalam )onversi, &nda harus ingat untu)

    membeda)an antara simbol suhu yang mewa)ili suhu dan simbol suhu yang

    mewa)ili perbedaan suhu bah)an melalui simbol yang sama sering

    diguna)an untu) setiap )onsep. /alam )onversi di bawah ini )ita a)anmembeda)an antara suhu dan perbedaan suhu untu) )e0elasan.

    1ertama, )ali)an setiap sisi persamaan yang diberi)an untu) Cp oleh fa)tor

    )onversi yang tepat untu) meng)onversi ! " #$g mol% #&$% )e #'tu " lb mol

    #o%. $ali)an sisi )iri oleh fa)tor-fa)tor dalam )urung )ota)

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    ebuah )ali)an sisi )anan dengan set yang sama fa)tor )onversi.

    elan0utnya, mengganti)an hubungan antara suhu di $ dan suhu di .

    $e dalam persamaan yang diberi)an untu) Cp mana T) muncul.

    &)hirnya, mela)u)an operasi matemati)a yang ditun0u))an dan

    meng)onsolidasi)an 0umlah untu) mendapat)an