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When 80g of water of 40° C is mixed with 40g ice of 0°C, the common temperature is .. |
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Answer» ong>Answer: I got about 31.4 ∘ C . This is asking you to look at the HEAT transfer between a hotter substance and a colder substance, and the hotter transfers to the colder. I would EXPECT the result to be closer to 25 ∘ C than to 40 ∘ C because there is more colder water than hotter water. So, you will have to use the heat FLOW equation: q = ± m c Δ T = ± m c | T f − T i |
Keep in mind that q > 0 if heat is absorbed and q < 0 if heat is released. So q < 0 for the hotter water and q > 0 for the colder water. That is so that: q hotter + q colder = 0 , i.e. we have conservation of energy for ideal closed systems. |
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