Chemistry Help! Math Equations with Gas Laws?

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Frannie D

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A sample of nitrogen gas is confined in a 5.790 L container at 2.578 x 102 torr and 64 oC. How many moles of gas are present in the sample?

A sample of Freon-12 (CF2Cl2) occupies 2.782 x 101 L at 260 K and 2.563 x 102 kPa. Find its volume (in L) at standard temperature and pressure (STP).

What is the mass of CO2 gas inside a 3.417 L glass bulb at a pressure of 7.596 x 10-1 atm. The measurement is carried out at a temperature of 34 oC.

An unknown sample of gas was weighed in a sealed flask. The empty flask had a mass of 2.845 x 101 grams. The mass of the flask with the sample was 4.468 x 101 g. At a temperature of 67 oC the gas sample occupied 8222 mL at a pressure of 1.380 atm. What is the number of moles of the unknown gas in the sealed flask ?
 
use

PV = nRT

If you know any three of P, V, n, T you can find the fourth

Mass of gas = moles gas x relative molar mass

In the last problem, the weights are irrelevant so far (you will need them if you are asked the molar mass)

T is in K

Remember to convert torr to atm

Do your own homework, and LEARN.

good luck!
 
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