Question

How much energy is required to bring a 30 gram crayon from room temperature, 25 degrees C, to its melting point 49 degrees C?

Answer 1

Answer:

1540.8 Joules of energy is required to bring a 30 gram crayon from room temperature, 25 degrees C, to its melting point 49 degrees C

Explanation:

Crayon is paraffin wax. The specific heat of paraffin wax is 2.14 J/g°C

As we know

$Q = m*c *\Delta T$

Where

$\Delta T$ is the change in temperature $T_2- T_1$

m is the mass of the object

c is the specific heat in J/g°C

Substituting the given values, we get -  

$Q = 30 * 2.14 *(49-25)\\Q = 1540.8$    Joules

1540.8 Joules of energy is required to bring a 30 gram crayon from room temperature, 25 degrees C, to its melting point 49 degrees C