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timama [110]
2 years ago
7

How many grams of ice at -12.1 ∘C can be completely converted to liquid at 15.2 ∘C if the available heat for this process is 4.4

9×103 kJ ? For ice, use a specific heat of 2.01 J/(g⋅∘C) and ΔHfus=6.01kJ/mol .
Chemistry
1 answer:
ra1l [238]2 years ago
8 0

Answer:

The mass of ice is 1,06 kg

Explanation:

Formula for calorimetry:  Q = m . C . ΔT

Formula for phase transition, with latent heat: Q = L . m

m . C . ΔT + L . m + m . C . ΔT = 4490 kJ

m . 2,01 J/g°C (0° - (-12,1°C) + 334 J/g . m + m . 4,186 J/g°C . (15,2°C - 0°C)

Our unknown value is mass

<em><u>You should look for latent heat of Ice and of course, specific heat of water.</u></em>

Those are constant and they are known.

<u>As the units are in J, and the heat for the process is in Kj we have to convert the final number into J</u>

4490kJ . 1000 = 449000 J

m. 2,01 J/g°C (0°-(-12,1°C) + 334 J/g .m +m .4,186 J/g°C .(15,2°C - 0°C) = 449000 J

m. 24,321 J/g + 334 J/g .m + 63,62 J/g . m = 449000 J

421,94 J/g . m =  449000 J

m =  449000 J /421,94 g/J = 1064,1 g ---->1,06 kg

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