Gases and Moles

- the volume occupied by a certain gas depends on the temperature and pressure

..these are 2 very important things to remember..

1. STANDARD TEMP. = (t=0 degrees Celsius) and PRESSURE = (P=101.3kPa)
2. the volume of any gas at STP is 22.4L/1 mol or 1 mol/22.4L

examples:

1) find the volume occupied by 0.060mol of CO2 at STP

0.060mol x 22.4L/1mol = 1.34L = 1.3L

2) find the mass of a 100.0mL sample of NO2 at STP

100.0mL x 1L/1000mL x 1mol/22.4L x 46.0g/1mol = 0.41g

This is a quick review about moles(refer to the bottom of the link's page to what we learned about gases!)