A couple of anoying problems that i know i should be able to do but are just getting me frustrated.(adsbygoogle = window.adsbygoogle || []).push({});

1. A 50.0-g copper calorimeter contains 250g of water at 20 degrees C. How much steam must be condensed into the water if the final temperature of the system is to reach 50 degrees C

so, the water and the copper colorimeter are gaining heat and the steam is loosing heat via the latent heat of vaporisation.

so

.05 * 387 * (50-20) + .250 * 4180 * (50-20) = 2.26*10^6 * massofsteamrequired

580.5 + 31350 = 2.26*10^6 * massofsteamrequired

so mass of steam required = 14.12g

yet i am told it is meant to be 12.9g

2. In an insulated vessel, 250g of ice at 0 degrees C is added to 600 g of water at 18 degrees C

a, what is the final temperature of the system.

b, how much ice remains when the system reached equilibrium.

for a, the ice is at 0 degrees so it will gain energy from the water for the latent heat of fusion then gain energy as water to reach an equilibrium. the water will loose energy to reach an quilibrium.

i am stuck on this one. I am told the answer is 0 degrees C but i cant find how to get it.

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# Homework Help: Specific & Latent Heat

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