If 10 cal of energy are added to 2 g of ice at -30°C calculate the final temperature of the ice

Question

If 10 cal of energy are added to 2 g of ice at -30°C calculate the final temperature of the ice

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Thu Hương 3 days 2021-07-19T14:33:28+00:00 2 Answers 0 views 0

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    0
    2021-07-19T14:35:12+00:00

    Answer: the correct answer is -20

    Explanation:

    0
    2021-07-19T14:35:14+00:00

    Answer:

    The final temperature of the ice is -40^{\circ}\ C.

    Explanation:

    It is given that,

    Energy, Q = 10 cal

    Mass of ice, m = 2 g

    Initial temperature, T_1=-30^{\circ}\ C

    We need to find the final temperature of the ice. We know that the specific heat of ice is 0.5\ cal\ g^{-1} ^{\circ} C^{-1}

    The heat added in terms of specific heat is given by :

    Q=mc(T_1-T_2)

    T_2 final temperature of the ice

    c is specific heat of ice

    T_2=T_1-\dfrac{Q}{mc}\\\\T_2=(-30)-\dfrac{10}{2\times 0.5}\\\\T_2=-40^{\circ}

    So, the final temperature of the ice is -40^{\circ}\ C.

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )