Question

How much energy is needed to melt 25.4 grams of I2?

Hfus=61.7 J/g

Type the correct answer to 3 digits. If the answer has an exponent, type the number, then ^, then the exponent.

(The picture might make the question more clearer.)

Answer 1

We know the equation of latent heat:

Q = mL

(Energy = mass * latent heat)

Therefore, this problem is a regular application of this:

Q = 25.4 * 61.7

Q = 1567,18

With the 3 digits:

Q = 1570 J

Answer 2

Answer : The energy needed to melt 25.4 grams of
`I_2` is,
`1.57* 10^(3)J`

Explanation : Given,

Mass of
`I_2` = 25.4 g

`H_(fus)` = 61.7 J/g

As, 1 gram of
`I_2` melt to needed energy = 61.7 J

So, 25.4 gram of
`I_2` melt to needed energy =
`25.4* 61.7=1567.18J=1.57* 10^(3)J`

Therefore, the energy needed to melt 25.4 grams of
`I_2` is,
`1.57* 10^(3)J`