Chem engineering homework help

I have this proplem as a homework assignment and i'm a bit stuck as houw to set it up. Here it is:

Propane gas enters a continuous adiabatic heat exchanger at 40 degrees C and 250 kPa and exits at 240 degrees C. Superheated steam at 300 degrees C and 5.0 bar enters the exchanger flowing countercurrent,y to the propane and exits as a saturated liquid at the same pressure.

I know how to draw the process flowchart, but the problem also asks to include in the labeling the mass of the steam fed (kg). I have no idea how to figure this out. Is it in some table, or chart?

Please Help, 'cause i am stumped!

-Thanks in advance...

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