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Vikki [24]
4 years ago
9

A 500.-liter volume of helium gas is at a pressure of 450 mmHg and has a temperature of 300.K. What is the volume of the same ga

s at STP?
10 points
A. 270L
B. 550L
C. 150L
D. 1200L
Chemistry
1 answer:
AVprozaik [17]4 years ago
3 0

Answer:

The correct answer is A. 270L

Explanation:

We use the gas formula, which results from the combination of the Boyle, Charles and Gay-Lussac laws. According to which at a constant mass, temperature, pressure and volume vary, keeping constant PV / T. The conditions STP are 1 atm of pressure and 273K of temperature.

We convert the unit of pressure in mmHg into atm:

760mmHg----1 atm

450mmHg---x= (450mmHgx 1 atm)/760mmHg=0,59atm

P1xV1/T1= P2xV2/T2

V2=((P1xV1/T1)xT2)/P2

V2=((0,59atmx500L/300K)x273K)/1 atm=<em>269,407 L</em>

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