0

# you have a block of material that measures 2.5cm x 3.5cmx 10.7cm and hasd a density of 10.68g/cm. the block has a density of 10.68g/cm. the block has a specific

you have a block of material that measures 2.5cm x 3.5cmx 10.7cm and hasd a density of 10.68g/cm. the block has a density of 10.68g/cm. the block has a specific heat of 0.222cal/gc and is heated from -40c to 120c. howmany joules of heat did it take to do this?

### 2 Answers by Expert Tutors

Carl F. | Knowledgeable Chemistry tutorKnowledgeable Chemistry tutor
1.0 1.0 (1 lesson ratings) (1)
0
Following the steps of the previous answer,
V= 2.5cm*3.5cm*10.7cm= 93.625 cm3
m= 93.625cm3 * (10.68g/1 cm3) = 999.915g
ΔT = 120 ºC - (-40ºC) = 160 ºC
(4.1868 J/1cal)* (0.222 cal/g ºC) = .9294696 J/gºC

Q= (999.915g) * (.9294696 J/gºC) * 160 ºC = 148702 J or 150kJ to 2 sig figs
Andre W. | Friendly tutor for ALL math and physics coursesFriendly tutor for ALL math and physics ...
5.0 5.0 (3 lesson ratings) (3)
0
1. Find the volume of the block (in cm³).
2. Find the mass of the block (in g).
3. Find the change in temperature ΔT (in °C)
4. Convert c=0.222 cal/g°C to J/g°C
5. Find the needed heat energy, Q=m c ΔT