Chemists use the calorie as a unit of energy. It is the energy needed to heat 1

Question

Chemists use the calorie as a unit of energy. It is the energy needed to heat 1 gram of water 1 degree Celsius. As a formula: H = in (change in temperature) where H is the heat needed in calories, m is the mass in grams and the change in temperature is measured in Celsius. A calorie is equal to 4.2 Joules. 8. How much energy is needed to heat 10 grams of water 1 degree Celsius. Write your answer in both calories and Joules. 9. How much energy is needed to heat 50 grams of water 3 degree Celsius. Write your answer in both calories and Joules.

Explanation / Answer

8) H = m*change in temparature
here change in temparature = 1 degree celsius

m = 10 g

then energy needed is H = 10*1 = 10 cal

but 1 cal = 4.2 J

then H = 10*4.2 = 42 J

9) H = m*change in temparature = 50*3 = 150 cal

but 1 cal = 4.2 J

then H = 150*4.2 = 630 J

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