How much heat is required to raise the temperature of 86.5g of water from its melting point to its boiling point

Explanation:

Assuming that pressure is equal to

1 atm

, boiling water at its boiling point implies providing it with enough heat to turn it from liquid at

100

∘

C

to vapor at

100

∘

C

.

The amount of heat needed to allow one mole of water to undergo this phase change is called the enthalpy chnge of vaporization,

Δ

H

vap .For water at

100

∘

C

, the enthalpy change of vaporization is equal to

Δ

H

vap

40.66 kJ/mol

girl imma just put my comment here because i need a couple point okurrttt

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.