How much heat do you need to raise the temperature of 150g of ice from -30c to -15c?

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25-04-2018
Physics

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How much heat do you need to raise the temperature of 150g of ice from -30c to -15c?

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jushmk jushmk · Answer 1 · 2018-05-05T15:30:01+02:00

jushmk jushmk

05-05-2018

Heat required = mass (g)*specific heat (c)* Temperature change (ΔT)

Given,
mass = 150 g, specific heat = 4.187 J/g.K, ΔT = -15 -(-30 = -15+30 = 15 K

Therefore,

Heat, H = 150*4.187*15 = 9420.75 J

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shirleywashington shirleywashington · Answer 2 · 2019-04-01T17:04:24+02:00

Answer : Heat required is 9418.5 J

Explanation :

Given that,

Mass of the ice, m = 150 g

Initial temperature of the ice, [tex]T_i=-30\ ^0C[/tex]

Final temperature of the ice, [tex]T_f=-15\ ^0C[/tex]

We know that heat required is given by :

[tex]Q=mc\Delta T[/tex]

[tex]\Delta T[/tex] is change in temperature or [tex]\Delta T=T_f-T_i[/tex]

c is the specific heat, [tex]c=4.186\ J/g\ ^0C[/tex]

[tex]Q=150\ g\times 4.186\ J/g\ ^0C\times (-15-(-30))\ ^0C[/tex]

[tex]Q=9418.5\ J[/tex]

Hence, this is the required solution.