Question

The specific heat of iron is 0.11 cal/goC. A cafeteria fork made of iron has a mass of 20 grams. How much heat energy is needed to raise the temperature of this form from 25oC to 75oC?

0.044 calories
0.275 calories
110 calories
9090.9 calories

Answer 1

Answer: 110 cal

It is given that he specific heat of Iron is
`0.11 cal/g^o C`.

Mass of iron fork 20 g

Heat energy is needed to raise the temperature of this from
`25^o C to 75^o C`

we can use the following formula to calculate heat energy:

`Q=mC \Delta T`

where Q is the heat required to raise the temperature by
`\Delta T` of a mass m having specific heat C.

Insert the values:

`Q=20 g * 0.11 cal/g^oC (75^o C -25^o C)\\\Rightarrow Q=(2.2*50)cal=110 cal`

Thus, heat required to raise the temperature of iron fork is 110 cal.