A heating coil rated at 100W is used to boil off 0.5kg of boiling water. The time taken to boil off the water is [specific latent heat of vaporization of water = 2.3 x 10⁶Jkg^-1]

Myschool Paul

9 years ago

Thanks for your contributions. Corrections have been made

owolabimoses98

9 years ago

pt=ml

P=100w, m= 0.5kg, l= 2.3*10^6

By the formular

100t=0.5*2.3*10^6

100t= 1.15*10^6

make t the sub formular.

You are ask to look for t not 100t

Hence,

t=0.5*2.3*10^6/100

t=0.0115*10^6

t=1.15*10^6-2

Standard form

t=1.15*10^4s

Sammyporsche123

2 years ago

why is watt no converted to kilowatt

afolabiabdulsamad

9 years ago

But power is 100 watt not 1000

Breexy12

9 years ago

I THOUGHT THE ANSWER SHOULD BE 1.15EXP4