Question

How much thermal energy does it take to raise the temperature of 4.5kg of water for 12C to 97C the specific heat of water is 1.68kj

Answer 1

The amount of thermal energy needed is 626.6 J

Step-by-step explanation:

When a certain amount of heat energy Q is supplied to a substance, the temperature of the substance increases according to the equation

where m is the mass of the substance is the specific heat capacity of the substance is the change in temperature

Answer 2

642.6 kJ

Step-by-step explanation:

Using the formula for heat energy required:

`Q = mc \Delta T` ,

where:

C → specific heat capacity = 1.68 kJ/kg°C

Q → heat energy required = ?

m → mass of the object = 4.5 kg

ΔT → change in temperature = 97°C - 12°C = 85°C,

Q = 4.5 x 1.68 x 85

= 642.6 kJ