Question

How much heat do you need to raise the temperature of 100g of aluminum from 30 C to 150 C

A. -10.8 x 10^3 kJ
B. 10.8 kJ
C. 10.8 x 10^3 kJ
D. -10.8 kJ

Answer 1

The Answer is actually 10.8 kJ

Step-by-step explanation:

It's not -10.8 KJ y'all, do NOT get confused. I got it wrong when I wrote -10.8 KJ. I took the test and it's 10.8 KJ without the negative.

Answer 2

Q = 10.8 KJ

Step-by-step explanation:

Given data:

Mass of Al= 100g

Initial temperature = 30°C

Final temperature = 150°C

Heat required = ?

Solution:

Specific heat of Al = 0.90 j/g.°C

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = 150°C - 30°C

ΔT = 120°C

Q = 100g×0.90 J/g.°C× 120°C

Q = 10800 J (10800j×1KJ/1000 j)

Q = 10.8 KJ