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Please Help?..chem...im just so confused.. Gas Laws?
1. What volume will 300 mL of gas at 20 degrees celcius occupy if the temperature is reduced to -80 degrees celcius and the pressure increased to 760 mm Hg?
2. A sample of gas of mass 2.82 g occupies a volume of 639 mL at 27 degrees celcius and 1.00 atm pressure. What is the molar mass of gas?
3. A gas placed in a storage tank at a pressure of 20.0 atm at 20.3 degrees celcius. As safety device, there is a small metal plug in the tank made metal alloy that melts at 125 degrees celcius. If the tank is heated, what is the maximum pressure that will be attained in the tank before the plug will melt and release gas?
4. Sixty liters of gas were collected over water when the barometer read 670 mm Hg, and the temperature was 20 degrees celcius. What volume would the dry gas occupy at standard conditions?
5. Eight moles of hydrogen gas at 0 degrees celcius are forced into a steel cylinder with a volume of 300 mL. What is the pressure of the gas in the cylinder?
1st know that P stands for Pressure V stands for volume and T stands for temp. All your temps have to be in Kelvin. which is celcius +273.15= Kelvin.
2nd literally right down what each variable is and identify what you are solving for.
3rd use this formula. (P1)(V1) all over T1 and set it equal to (P2)(V2) all over T2
The p1,t1, and v1 are initial and the 2s are after.
Check out this site: http://dbhs.wvusd.k12.ca.us/webdocs/GasLaw/Four-Gas-Variables.html
The problems on that site also have the formulas if you cant picture mine.
Im doin that in my chem class too so good luck!
