Dimensional Analysis

[troublemaker676]

I'm not sure how to solve this problem, could someone show me how to set it up and solve it? Here is the problem:

How many calories of heat are needed to raise the temp. of 8.1 grams of water to 20 degrees celcius?

I know that 1 calorie of heat is needed to raise 1 gram of water 1 degree celcius. I know you can use dimensional analysis to solve it but not sure how. Any help would be greatly appreciated!

 

[stapel]

It's been a while since I did this sort of thing in chemistry, so I may be forgetting something, but if it's just the math, then:

. . . . .(1cal / 1gm-deg) (8.1gm / 1) (20deg / 1) = 162 cal

But, like I said, I could be forgetting something. If another tutors says something different, go with that.

Eliz.

 

[troublemaker676]

Can you show me how you set that up? I'm really bad at dimensional analysis and have no clue how to set up a problem like that. That is the right answer also. Thank you.

 

[stapel]

Can you show me how you set that up?

Umm... Look at the indented line. That's how I set it up.

Eliz.