Question

1. A sample of solid tungsten is heated with an electrical coil. If 27.1 Joules of energy are added to a 11.3 gram sample initially at 21.9°C, what is the final temperature of the tungsten?

Answer: °C.

2. A sample of solid iodine is heated with an electrical coil. If 100. Joules of energy are added to a 14.4 gram sample and the final temperature is 40.0°C, what is the initial temperature of the iodine?

Answer: °C.

5.1

Answer 1

1)

Given:

Q = 27.1 J

m = 11.3 g

C = 0.134 J/g.oC

Ti = 21.9 oC

use:

Q = m*C*(Tf-Ti)

27.1 = 11.3*0.134*(Tf-21.9)

Tf -21.9 = 17.9 oC

Tf = 39.8 oC

Answer: 39.8 oC

Only 1 question at a time please