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How much heat is needed to raise the temperature of 5g of water from 50c to 75c

1 Answer

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Answer:

Since we're trying to find heat energy (Q) needed, we're going to use the formula for Q.

Q = (mass) x (specific heat capacity) x (change in temperature)

The mass of water is 5g here

The specific heat capacity of water is 4.18J/g (memorize the value since not many questions actually tell you the specific heat capacity)

The temperature change of water is 75 - 50 = so 25 degrees celsius

Now just plug them into the equation:

Q = (5g) x (4.18) x (25)

Q = 522.5 J (if you need this in kJ you have to divide the value by a 1000 or just move the decimal place to the left 3 times)

Therefore you need 522.5J or 0.5225 kJ of heat energy to raise the temperature of 5g of water from 50c to 75c

User Dilmah
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