Question

calculate the amount of heat released when 77.0g of steam at 104.5 celsius cools to ice at 0.0 celsius.

I don't understand the steps to take to solve this problem. Can someone walk me through it please?

Answer 1

Three equations work almost all of these. In general here they are. Fit them to your problem.
WITHIN a phase (all liquid, all steam, all ice) use
q = mass of the phase x specific heat of the phase x (Tfinal-Tinital)

At a phase change (example melting point) use q = mass of the phase x heat fusion

At a phase change (example boiling point) use q = mass of the phase x heat vaporization.

Those three will take you where you want to go. This will get you started.
q1 = heat released to go from steam at 104.5 to 100 (the boiling point).
q1 = mass steam x specific heat steam x (Tfinal-Tinitial)
q1 = 77.0 x ??you look it up x (100-104.5) = ?

Then q2 = heat released on condensing steam at the boiling point from vapor to liquid.
q2 = mass steam x heat vaporization
q2 = 77.0 x you look up Hvap.

hen you've gone from steam to liquid at 100 to liquid at 0C to ice at 0c. then add the q values together.