wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

It takes 15 minutes for an electrical kettle to heat a certain quantity of water in grams from 0oC to boiling point 100oC. If it takes 81 minutes to boil water into steam, the latent heat of steam is :

A
80 cal/g
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
540 cal/g
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C
100 cal/g
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
336 cal/g
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is A 540 cal/g
Suppose mass of water = m
Heat required to raise its temperature from 0o C to 100o C is 100m
Heat produced by the kettle in 15 minutes = 100m
So, feat produced by the electric kettle in one minute =100m15

And, heat produced by the electric Kettle in 81 minutes =100m×8115cal
Suppose Latent heat of steam = L cal/gm
Heat required by m grams of water to boil off into steam =mL cal
mL=100m×8115
L=540 cal/gm

flag
Suggest Corrections
thumbs-up
1
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
The First Law of Thermodynamics
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon