Question

3 10.0 grams of granite is heated from 30 °C to 50 °C . How much energy does this require? The specific heat of granite is 0.79J/goC

Answer 1

Answer:

The energy required is 158 J

Explanation:

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

When the heat added or removed from a substance causes a change in temperature in it without affecting its molecular structure, this heat is called sensible heat.

In other words, when a system absorbs (or gives up) a certain amount of heat, it can happen that it experiences a change in its temperature, which implies sensible heat.

The equation that allows calculating heat exchanges is:

Q = c * m * ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case:

• c=0.79 $\frac{J}{g*C}$

• m= 10 grams

• ΔT= Tfinal - Tinitial= 50 C - 30 C= 20 C

Replacing:

Q= 0.79 $\frac{J}{g*C}$ *10 g* 20 C

Solving:

Q= 158 J

The energy required is 158 J