Question

A quantity of 14.1 cm^3 of water at 8.4°C is placed in a freezer compartment and allowed to freeze to solid ice at -7.2°C. How many joules of energy must be withdrawn from the water by the refrigerator?

Answer 1

Answer:920.31 J

Step-by-step explanation:

Given

Volume of water (V)
`=14.1 cm^3`

mass(m)
`=\rho * V=1000* 14.1* 10^(-6)=14.1 gm`

Temperature
`=8.4^(\circ) C`

Final Temperature
`=-7.2 ^(\circ)C`

specific heat of water(c)
`=4.184 J/g-^(\circ)C`

Therefore heat required to removed is

`Q=mc(\Delta T)`

`Q=14.1* 4.184* (8.4-(-7.2))`

`Q=920.31 J`