Posted by **mike** on Wednesday, May 4, 2011 at 9:30pm.

If 1200 cal of heat are added to 50 g of water initially at a temperature of 15 oC, what is the final temperature of the water?

- physics -
**Jai**, Wednesday, May 4, 2011 at 10:00pm
the energy needed to increase or decrease the temperature of a given substance is given by

Q = mc(T2-T1)

where

Q = heat (in J or cal)

m = mass (in g)

c = specific heat capacity (in J/g*K or cal/g*K)

T = temperature (in Kelvin)

**change in temperature can have unit degree Celsius or Kelvin,, thus you can use it interchangeably (what i mean is that the units for c can also be J/(g*C))

signs:

Q: (+) when heat is absorbed by substance

Q: (-) when heat is released from substance

for water, c = 1 cal/g*K.

substituting,

1200 = (50)(1)(T2 - 15)

1200 = 50*(T2) - 750

1950 = 50*(T2)

T2 = 39 deg C

hope this helps~ :)

## Answer This Question

## Related Questions

- physics - 0.1kg of ice initially at a temperature of -10 degrees Celsius is ...
- CHEM - You have a bottle of water. The water has a mass of 29 grams. You heat ...
- Physics - Ice of mass 51.5 g at -10.2° C is added to 218 g of water at 13.5° C ...
- Physics - 500 J of heat are added to 59 g of water initially at 20°C. (a) How ...
- Science - 90 calories of heat is added to 1 gram of fresh water with an initial ...
- Physics - A 100-g aluminum calorimeter contains a mixture of 40 g of ice and 200...
- physics - Assume that 10 g of steam is added to 100 g of water initially at 19°C...
- physics - 1. Assume that 10 g of steam is added to 100 g of water initially at ...
- physical science - If 500 kg of water at 200 degrees F is poured into a lake ...
- physics - A 40-g block of ice is cooled to −71°C and is then added to 590...

More Related Questions