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Tutorial 4

In: Science

Submitted By pierregan
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UNIVERSITI TUNKU ABDUL RAHMAN
Centre
Course
Year/
Trimester
Lecturers

:
:
:

Centre for Foundation Studies
Foundation In Science
Year 1 Trimester 1

Unit Code
Unit Title
Session

:
:
:

FHSC1114
Physical Chemistry
2016/01

:

Ms. Azlina Banu, Mr. Law Soon Pin, Ms. Nabilah, Ms. Jamie Anne,
Ms. Phang Ying Ning

Tutorial 4: Chapter 4 States of Matter
1.

(a)

An engineer pumps air at 0 °C into a newly designed piston-cylinder assembly. The volume is measured to be 6.83 cm3. Calculate the temperature
(in K) when the volume increases to 9.75 cm3.
(Ans: 390 K)

(b)

A piston-cylinder assembly contains 3.0 g of helium, He, at room temperature.
More helium was added to the cylinder and the volume was adjusted so that the gas pressure remained the same. Calculate the mass of helium added to the cylinder if the volume was changed from 2.50 L to 3.70 L.
(Ans: 1.44 g)

2.

An ideal gas in a 2.08 L container exerts a pressure of 1.00 atm at 0 °C. Determine the required change in temperature to adjust the pressure of gas to 1.65 atm after it has been transferred to a 1.50 L container.
(Ans: 51.88)

3.

(a)

A 10.73 g sample of PCl5 is placed in a 4.00 L flask at 200 °C. Calculate the pressure of the flask.
(Ans: 0.5 atm)

(b)

At 10 °C and 102.5 kPa, the density of dry air is 1.26 g L-1. Find the average molar mass of the dry air under the same conditions.
(Ans: 28.94 g mol-1)

4.

At 23.5 °C, a balloon is filled with helium (He) to a volume of 12.5 L at a pressure of
1.00 atm. Oxygen (O2) is then added so that the final volume of the balloon is 26.0 L with a total pressure of 1.00 atm. Determine the final partial pressure of helium inside the balloon.
(Ans: 0.48 atm)
[April 2010]

5.

A 2.5 dm3 closed vessel contains nitrogen and xenon at a pressure of 58.5 kPa and a temperature of 320 K.
(a)

If the partial pressure of xenon is 25.8 kPa, determine the mass of nitrogen in
the…...

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