Problem Answer

For the substance, this process is endothermic, so the heat of the process is + 140 kilocalories.


Hide Pop-up Window

Use border to drag pop-up window.

CheMagic Logo

Go CheMagic Home

Calculate Stoichiometry Expression

Calculating with Q=PcM


Get Problem Answer  |  Get New Problem  |  Go Problem Menu


Problem


Calculate the number of kilocalories of heat exchanged during the evaporation (liquid --> gas) of 287 grams of a liquid substance at 10.0 degrees C. The absolute value of liquid/gas phase change constant for this substance at 10.0 degrees C is 488 cal/g. Express your answer so that it indicates both the quantity (kilocalories) and the direction (sign) of the heat flow for the substance during the phase change?

"Will you walk into my parlour?" said the Spider to the Fly,
"'Tis the prettiest little parlour that ever you did spy..."
Mary Howitt-1834