heat=masswater*c*changeInTemp
= 2kg*4.18kJ/kgC*7.2C which is your answer in a)
When coal is mined, it is tested for how much heat it can produce when it burns. A 1.245g sample of coal was placed into a calorimeter containing 2000.0 mLs of water at 17.5 degrees Celsius. After the coal was combusted in the calorimeter, the water's temperature was found to be 24.7 degrees Celsius.
a)How many Joules (J) of heat were produced by the burning of this coal sample? I got 60,249.6J is that correct?
b)How much heat would 1.00 kg of this coal produce? I got 48,393,253.01 again is that right?
c)How many BTU's/pound would this coal produce? 1 Joule = 9.5 x 10 to the -4 BTU of heat. (A BTU is a British Thermal Unit) There are 453.6 grams in 1 pound. This I am completely stuck on please help.
2 answers
I agree with Bob P but your answer, with that many significant figures, could be counted wrong.
b. is right. Same comment about s.f.
b. is right. Same comment about s.f.