Question

How much thermal energy is in 100 grams of water at 50 degrees Celsius

Answer 1

Step-by-step explanation:

Thermal energy is defined as the internal energy of a substance or object which is due to kinetic energy of its atoms or molecules.

Relation between heat energy, mass and temperature is as follows.

q =
`m * C * \Delta T`

where, m = mass

C = specific heat

`\Delta T` = change in temperature

It is given that mass is 100 g and temperature change is
`50^(o)C`. Specific heat of water is 4.18
`J/g ^(o)C`.

Therefore, calculate the energy as follows.

q =
`m * C * \Delta T`

=
`100 g * 4.18 J/g ^(o)C * 50^(o)C`

= 20900 J

Thus, we can conclude that thermal energy of water for given values is 20900 J.

Answer 2

when the thermal energy is the energy contained within a system that is responsible for its temperature.

and when the thermal energy is can be determined by this formula:

q = M * C *ΔT

when q is the thermal energy

and M is the mass of water = 100 g

and C is the specific heat capacity of water = 4.18 joules/gram.°C

and T is the difference in Temperature = 50 °C

So by substitution:

∴ q = 100 g * 4.18 J/g.°C * 50

= 20900 J = 20.9 KJ