Question

A 115-g sample of steam at 100 °C is emitted from a volcano. It condenses, cools, and falls as snow at 0.0 °C. How many kilojoules were released?

Can someone please teach me how to do this? I've seen other posts, but I don't understand that Q1, Q2, Q3 thing. I'm not sure what numbers to enter where, if that makes sense.

Answer 1

I hope Hi and K are not the same person. To be brief, the problem is to determine the heat released when 115 g steam @ 100 C condenses, falls to zero, and freezes as snow. That's three steps. The steam must condense and that's q1 for that step. Then the water falls in temperature from 100 C to zero C and the heat released in that step is q2. The the liquid water @ zero C freezes to solid water as snow and that's q3. The total heat released then is Qtotal = q1 + q2 + q3.
For the specifics of that as well as how to do ANY problem like this, go to the site from K. That is https://www.jiskha.com/questions/1864658/a-115-g-sample-of-steam-at-100-c-is-emitted-from-a-volcano-it-condenses-cools-and
If you need further assistance post your work and explain clearly what you don't understand. For example, not understand what q1, q2, q3 is very clear and where I started with this post. For what numbers to substitute see the link above. I gave specifics for q1 and q2.