Question

How much heat energy would be needed to raise the temperature of a 15.0 g sample of iron [Specific Heat = 0.448 J/(g°C)] from 22.0°C to 100.0°C?1. 524J2. 11J3. 249J4. 8495. 201J

Answer 1

Answer:

$524\text{ J}$

Explanation:

Here, we want to get the amount of heat energy needed

Mathematically:

$Q\text{ = mc}\Delta T$

where:

Q is the amount of energy that we want to calculate

m is the mass of the iron sample which is 15 g

c is the specific heat capacity which is 0.448 J/g°C

ΔT is the change in temperature which is (100-22) = 78°C

Substituting the values, we have it as:

$Q\text{ = 15 }\times\text{ 0.448 }\times\text{ 78 = 524.16 J}$