Honors Chemistry Podcast 2.3 Joule Problems

Q = mc

D

T

Q = mc D T c = specific heat for water = 4.18 joules/ g o C m = mass of sample D T = change in temperature of sample in o C

Sample Problems 1)If 4.0 gram of water absorbs 1.0 KJ of heat, how much will the temperature of the water change?

3) The temperature of a sample of water increases from 30.

0 C to 40.

0 C as 100. Joules of heat are added. What is the mass of the sample.

5) What is the number of Joules of heat energy released when 25 grams of water is cooled from 20.

0 C to 10. 0 C.

7) What temperature change in degrees Celsius is produced when 3.00KJ are absorbed by 100g of water?

9) What is the final temperature after 340. joules is absorbed by 10.0g of water at 25°C

11) How many grams of liquid water at 100°C can be vaporized to gaseous water at 100 °C by the absorption of 30.0KJ