Posted by **Pyrgus** on Wednesday, October 4, 2006 at 5:29pm.

Can somebody please help me with this question? That'd be great. Thanks!

Determine the amount of heat needed in the following:

the number of calories to heat 25 grams of water from 22 degrees celcius to 44 degrees celcius.

Q= m c deltaTemp

= 25g*1cal/gC*(44-22)C

=25*22 calories. If you want it in other units, either convert, or use the specific heat in those units.

Thank you! I have a problem that asks for the number of joules. Should I do it in calories first and convert it to joules?

As Bob Pursley pointed out to you in his post, you may use 1 cal/g*C, then convert to Joules knowing that 1 cal = 4.184 joules OR you may use 4.184 joules/g*C in place of the 1 cal in the calculations (for specific heat) of q = mcdeltaT and get the joules directly.

## Answer this Question

## Related Questions

- chemistry - using the values for heat of fusion, specific heat of water, or heat...
- Chemistry - Calculate (in calories) the amount of heat needed to melt 96g of ice...
- chemistry - a 100 mL {100 grams} of water at 4.0 degrees celsius is heated until...
- Science - 1. How much heat energy is lost by 3 kg of water when it cools from 80...
- Chemistry - The heat of fusion for water is 80cal/g. The specific heat of liquid...
- chemistry - Liquid water has a specific heat of 4.184 J/g degrees celcius. If 50...
- Physics - 400 grams of a metal at 300 C is added to 100 grams of of water at 20...
- Chemistry - Can someone please help me with the following? How do I find the ...
- science - a 100 mL {100 grams} of water at 4.0 degrees celsius is heated until ...
- Chemistry - Record the amount of heat needed to change phases for water-ice to ...

More Related Questions