How much 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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Chemistry Cherry 5 years 2021-09-01T02:23:46+00:00 2021-09-01T02:23:46+00:00 1 Answers 21 views 0

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Captcha* Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )

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phucdien · Answer 1 · 2021-09-01T02:25:39+00:00

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