Posted by **Lee** on Wednesday, May 11, 2011 at 9:50pm.

A 1.00 L sample of a pure gas weighs 0.785 g and is at 733.4 torr and 29.2 degree celcius.

a) what is the molar mass of the gas?

b) if the volume of the temperature are kept constant while 0.400 g of the same gas are added to that already in the container, what will the new pressure be?

- Chemistry -
**DrBob222**, Wednesday, May 11, 2011 at 10:01pm
Note the correct spelling of celsius.

1). Use PV = nRT and solve for n = number of moles, then n = grams/molar mass. You have n and grams, solve for molar mass. Don't forget to convert T to kelvin and P to atmospheres.

2) Add 0.400 g to grams already there, use the molar mass from the first part to convert grams to moles, then use PV = nRT and solve for pressure in atmospheres.

## Answer this Question

## Related Questions

- Chemistry - A 1.00 L sample of a pure gas weighs 0.785 g and is at 733.4 torr ...
- Chemistry - A sample of a gas weighs 4.526g and has a volume of 890.0 mL at 645....
- Chemistry - A sample of gas weighs 2.832g and has a volume of 1010.0 ML at 775....
- Chemistry - A sample of a gas weighs 4.526g and has a volume of 890.9 mL at 645....
- chemistry - Someone can help me please? A gas sample weighing 0.528 g is ...
- Chemistry - A volume of 725 mL of a gas is collected at 105 degrees celcius and ...
- chemistry - A sample of gas with a mass of 1.62 g occupies a volume of 941 mL at...
- Chemistry - Please let me know how I am doing with the following three chemistry...
- chemistry - A 200-mL sample of Oxygen gas is collected at 26 degrees C and a ...
- Chemistry - Please let me know how I'm doing with the following chemistry ...

More Related Questions