Question

Assuming that the heat capacities don't change with temperature, how much energy in kilojoules is needed to heat 7.70 g of Hg from a temperature of 58 to 51

Answer 1

Answer : The energy needed is,
`7.55* 10^(-3)kJ`

Explanation :

Formula used :

`q=m* c* (T_(final)-T_(initial))`

where,

q = heat needed = ?

m = mass = 7.70 g

c = specific heat =
`0.140J/g^oC`

`T_(final)` = final temperature =
`58^oC`

`T_(initial)` = initial temperature =
`51^oC`

Now put all the given values in the above formula, we get:

`q=7.70g* 0.140J/g^oC* (58-51)^oC`

`q=7.546J=7.55* 10^(-3)kJ`

Thus, the energy needed is,
`7.55* 10^(-3)kJ`