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?
I don't understand the steps to take to solve this problem. Can someone walk me through it please?
Answers
DrBob222
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.
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.