Posted by **Please Help!** on Friday, October 10, 2008 at 9:13am.

i keep trying to do these problems and i don't understand them. please help me!!

1. Gas stored in a tank at 273 K has a pressure of 388 kPa. The save limit for the pressure is 825 kPa. At what temperature will the gas reach this pressure?

A. 850 K

B. 925 K

C. 580 K

D. 273 K

2. At 10 degrees C, the gas in a cylinder has a volume of 0.250 L. The gas is allowed to expand to 0.285 L. What must the final temperature be fore the pressure to remain constant? (Hint: Convert from degrees Celsius to kelvins using the expression C +273 = K)

A. 273 K

B.283 K

C. 323 K

D. 383 K

3.A gas has a volume of 5.0 L at a pressure of 50 kPa. What is the volume when the pressure is increased to 125 kPa? The temperature does not change.

A. 5.0 L

B. 3.0 L

C. 4.0 L

D. 2.0 L

- chemistry -
**drwls**, Friday, October 10, 2008 at 9:45am
All of these problems can be solved with the perfect gas law relationship

P V/T = constant

For example, in #3, T is constant so P*V = constant. Therefore

P1*V1 = P2*V2, where

"1" and "2" refer to initial and final conditions.

50 kPA*5.0 L = 125 kPa * P2

P2 = (50/125)*5.0 = 2.0 L (answer D)

Try doing the others yourself to get familiar with this type of problem

## Answer this Question

## Related Questions

- chem - Show work 1. How many moles of oxygen will occupy a volume of 2.50 liters...
- Chemistry Check? - 1. A sample of neon is collected at 1273.51 kPa and 12.0 oC. ...
- Chemistry combined gas law - Can someone tell me if I did this combined gas law ...
- Chemistry combined gas law - Can someone tell me if I did this combined gas law ...
- Physics - An oxygen tank of volume V is stored in a medical laboratory. ...
- chemistry - Condition Pressure Volume Temperature Comment initial 1.0 atm 22.4 L...
- Physics - If a tank contains water 4 m deep, what is the pressure at the bottom...
- Chemistry - A gas storage tank has a volume of 350,000 when the temperature is ...
- chemistry - The valve between a 5 liter tank in which the gas pressure is 911....
- chemistry - Consider a 50 L tank which hold 20 g of hydrogen gas, 20 g of carbon...