Question

B. When 34 700 J of heat are applied to a 350 g sample of an unknown material, the temperature rises from 22.0 °C to 173.0 °C
2. A barometer measures a pressure of 745 mm Hg. What is this pressure in atm? 0.980 atm d. 1.00 x 10 atm a. b. 1.02 atm 0.55
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Answer #1

3)

Given:

Q = 34700 J

m = 350 g

Ti = 22 oC

Tf = 173 oC

use:

Q = m*C*(Tf-Ti)

34700.0 = 350.0*C*(173.0-22.0)

C = 0.6566 J/g.oC

Answer: 0.657 J/g.oC

2)

Conversion to be used:

1 atm = 760 mm Hg

We have:

P = 745 mmHg

= 745 / 760 atm

= 0.980 atm

Answer: 0.980 atm

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