Saturday

September 20, 2014

September 20, 2014

Posted by **Sarah** on Monday, November 12, 2012 at 7:25pm.

I mainly have problems being able to tell which gas law equation I need to use when asked these types of questions and then being able to rearrange the equation to find my answer that I need. If there an easy way to do this or to be able to tell?

Thank you.

- Chemistry -
**DrBob222**, Monday, November 12, 2012 at 8:25pmIf you have two sets of conditions, the easy gas law to use is the

(P1V1/T1) = (P2V2/T2)

If you don't have two sets of data you almost certainly must use PV = nRT. Many times, and this problem is one of them, the problem gives grams so you calculate mols = n = grams/molar mass.

Also,if you mean by "rearranging the equation to find my answer" as rearranging the equation FIRST, I wouldn't do that. I would substitute into the equation you want (either of the two equations above), then rearrange the numbers to solve for the unknown.

For this problem you want PV = nRT.

P must be in atm (mmHg/760), n = mols = grams/molar mass, when you solve for T the answer will be in kelvin.

**Answer this Question**

**Related Questions**

Chemistry - A 3.80 L cylinder contains 6.83g of methane, CH4, at a pressure of ...

Chemistry - Methane gas, CH4, is sold in a 43.0L cylinder containing 5.91kg ....

Chemistry - Natural gas is almost entirely methane, CH4. What volume of natural ...

Chemistry - In an experiment, you fill a heavy walled 5.00 L flask with methane ...

Chemistry 105 - A gas mixture with a total pressure of 745 mmHg contains each of...

Chemistry - A gas mixture with a total pressure of 750 mmHg contains each of the...

chemistry - a 10.0L ballon contains helium gas at a pressure of 655mmHg, what is...

11th grade chemistry - a vessel contains 12 gm of methane gas at t degree ...

Physical Science - A cylinder contains a gas with the pressure of 125kpa at a ...

Chemistry - I'm trying to find the dry gas pressure of H2 in mmHg. The ...