Question
How many Btu's are required to change five pounds of ice at 20°F to water at 160°F?
a. 2,608 Btu’s
b. 1,390 Btu’s
c. 1,304 Btu’s
d. 141 Btu’s
I am trying ((160-20)x.5)x5 but not getting any of the possible choices. What am I missing?
Thanks for the help,
Chris
a. 2,608 Btu’s
b. 1,390 Btu’s
c. 1,304 Btu’s
d. 141 Btu’s
I am trying ((160-20)x.5)x5 but not getting any of the possible choices. What am I missing?
Thanks for the help,
Chris
Answers
bobpursley
you are missing two things.
a) you have to heat ice to 32F first
b) you have to melt ice at 32F
c)then you have to change the temp of water from 32 to 160..
a) you have to heat ice to 32F first
b) you have to melt ice at 32F
c)then you have to change the temp of water from 32 to 160..
Chris
Heat ice from 20 to 32= 6BTUx5lb=30
Melt Ice at 32=144x5lb=720
Change temp of water from 32to160=128x5LB=640
30+720+640=1390
Correct?
I think I got it. Thanks for the help. Cleared a lot of things up.
Melt Ice at 32=144x5lb=720
Change temp of water from 32to160=128x5LB=640
30+720+640=1390
Correct?
I think I got it. Thanks for the help. Cleared a lot of things up.
eric
ware do you add the 30 in