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In an insulated container, a mass m of steam at 100 ℃ condenses in 620 g...

In an insulated container, a mass m of steam at 100 ℃ condenses in 620 g of alcohol and then cools down, heating the alcohol from 20 ℃ to the final mixture temperature of 40 ℃? What is m? [Steam’s Latent heat of condensation is 540 cal/g; alcohol’s ca= .581 cal/(g * ℃) waters cw=1.00 cal/(g * ℃)]

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