Specific latent heat of vaporisation of water...

Watch
Stano005
Badges: 2
Rep:
?
#1
Report Thread starter 3 years ago
#1
Ok I get what it means, latent means hidden therefore latent heat means ‘hidden heat’, temperature does not change however heat is being supplied, vaporisation is when liquid is converting to a gas. In all specific latent heat of vaporisation means heat being added to liquid without the temperature changing, but i've been trying to workk out this homework task question for ages!!!

While a kettle boils, 0.018 kg of water changes to steam.
Calculate the amount of energy required for this change.
Specific latent heat of vaporisation of water = 2.3 × 106 (J / kg).

Can anyone help?!?!
0
reply
Eimmanuel
Badges: 13
Rep:
?
#2
Report 3 years ago
#2
(Original post by Stano005)
Ok I get what it means, latent means hidden therefore latent heat means ‘hidden heat’, temperature does not change however heat is being supplied, vaporisation is when liquid is converting to a gas. In all specific latent heat of vaporisation means heat being added to liquid without the temperature changing, but i've been trying to workk out this homework task question for ages!!!

While a kettle boils, 0.018 kg of water changes to steam.
Calculate the amount of energy required for this change.
Specific latent heat of vaporisation of water = 2.3 × 106 (J / kg).

Can anyone help?!?!
You can just use the formula mLv
where m is the mass of the water that changes to steam and
Lv is the specific latent heat of vaporisation of water.
0
reply
SnehS
Badges: 0
Rep:
?
#3
Report 3 years ago
#3
(Original post by Stano005)
Ok I get what it means, latent means hidden therefore latent heat means ‘hidden heat’, temperature does not change however heat is being supplied, vaporisation is when liquid is converting to a gas. In all specific latent heat of vaporisation means heat being added to liquid without the temperature changing, but i've been trying to workk out this homework task question for ages!!!

While a kettle boils, 0.018 kg of water changes to steam.
Calculate the amount of energy required for this change.
Specific latent heat of vaporisation of water = 2.3 × 106 (J / kg).

Can anyone help?!?!
Latent heat of vapourisation of water, means heat required to change1 kg of water at 100 degrees Celsius of water to 100 degrees of steam
So multiply the two given quantities
=0.018 (kg) x 2.3 x 10^6(J/Kg)
=41400 J
0
reply
Sneh Sood
Badges: 1
Rep:
?
#4
Report 3 years ago
#4
Sorry for the syntax error in the last message. It should read " Latent Heat of Vapourisation of water is equal to the heat energy needed to convert 1Kg of water at 100 degrees Celsius to 1 Kg of steam at 100 degrees Celsius"
0
reply
yes,i'msure
Badges: 1
Rep:
?
#5
Report 1 year ago
#5
i'm trying to work it out too
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

Should there be a new university admissions system that ditches predicted grades?

No, I think predicted grades should still be used to make offers (678)
33.7%
Yes, I like the idea of applying to uni after I received my grades (PQA) (857)
42.59%
Yes, I like the idea of receiving offers only after I receive my grades (PQO) (386)
19.18%
I think there is a better option than the ones suggested (let us know in the thread!) (91)
4.52%

Watched Threads

View All