Question

The specific heat of nickel is 0.44 J/g°C. How much energy needed to change the temperature of 95.4g of nickel from 32°C to 22°C. Is the energy absorbed or released?

Answer 1

`419.76` `J`, Released.

Explanation:

First of all, We will find whether the energy is absorbed or released.

The easiest way to find that is to observe the change in temperature.

We can see that, `"Final Temperature " lt " Initial Temperature"`.

So, The Heat Energy is released.

Now, Let's Calculate the Heat.

We know, `"Heat Released or Absorbed by the Body " = "Mass of the Body" xx "Specific Heat of the Material" xx "Change in Temperature"`.

Mathematically, `Q = msDeltaT`

Now, From the Question,

`color(white)(xxx)Q = 95.4 * 0.44 * (22 - 32)` [As, `DeltaT = T_"final" - T_"initial"`]

`rArr Q = -(95.4 * 0.44 * 10)`

`rArr Q = -419.76`

So, The Heat Energy Released is `419.76` `J`.

The negative sign indicates the energy is released.

Hope this helps.