A slab of granite has a mass of 1400.0 grams. The specific heat of granite is 0.040 J/gC. How much heat must be absorbed to raise the granite slab's temperature by 75 degrees C?

Question

11.8 kJ
80.5 kJ
88.2 kJ
19.5 kJ

I've tried solving this several times and I never get one of these answers. I remembered to convert from Joules into kilojoules. Could someone help me please? What's the correct answer? Why? Is the equation 0.840J/1400.0g x 75 degrees? Why does that come out to 125 kJ?

Answer 1

heatneeded=mass*specheat*changeinT
H=1400g*.04 J/gC * 75C=4.2kJoules
which is none of the answers given.
<<Is the equation 0.840J/1400.0g x 75 degrees? Why does that come out to 125 kJ?>> That is not the equation here, at all.

Answer 2

Bob I'm sorry, the heat is 0.840J

Answer 3

The Specific Heat formula is Q = m x c x delta T. So here that would be 1400 x 0.84 x 75 = 88.2 kJ

Answer 4

1. D : Energy
2. B : 4.2m/s
3. C : The moon's acceleration due to gravity is less
4. C : Reference level from which the height is measured
5. D : Gravitational
6. D : All of the above
7. B : Hadron fuel cells
8. C : Relatively inexpensive and readily available
9. C : Both a and b
10. D : 78J
11. D : Thermal energy
12. B : Kinetic energy plus its potential energy
13. D : Nuclear fission and fusion reactions
14. A :The chemical energy stored in living things
15. B : Depends on the climate
16. C : Thermal energy of the object
17. C : 88.2kJ

The answer for the Thermal Energy and Matter quiz

Answer 5

Thanks tyler 100% correct.

Answer 6

Thanks Tyler for the 100