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netineya [11]
3 years ago
10

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

Chemistry
1 answer:
USPshnik [31]3 years ago
7 0

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

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<h3>How to calculate weighted average?</h3>

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A redox reaction employed in an electrochemical cell has a negative . Which statement is true? a) E∘cell is positive b) K&gt;1 E
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