How Much Heat is Released When Water Cools?

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Need help on energy equations please!

Homework Statement


I need help on this homework question please i don't know how to solve it


Homework Equations


how many calories of heat are released by 25 g of water as it drops in temperature from 77 degrees c to 50 degrees c ( 1 cal= 4.18)


The Attempt at a Solution



I don't know which equation i should use
Q= cmDeltaT ?
 
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