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?

## 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

Tutors, please sign in to answer this question.

# 2 Answers

Following the steps of the previous answer,

V= 2.5cm*3.5cm*10.7cm= 93.625 cm

^{3}m= 93.625cm

^{3}* (10.68g/1 cm^{3}) = 999.915gΔT = 120

^{º}C - (-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

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