Gas Volumes and Concentration

Question 1

What is the equation for calculating gas volumes

Answer 1

volume dm^3 = 24 x moles

Question 2

What is the equation for calculating concentration

Answer 2

concentration g/dm^3 = mass/volume

Or

Conc = moles/volume

Question 3

When we compare two gases and have one of the volume but not the other.

BUT we have the molar ratio

What is the easy way to calculate volume of other

Answer 3

whatever the molar ratio is times the original volume of gas to work out the other

Question 4

What is the conversion from cm^3 to dm^3

Answer 4

1000cm^3 = 1 dm^3

i.e divide cm^3 by 1000

Question 5

What is the concentration

Answer 5

mass of solute in a given volume of solution

Question 6

What happens when you increase the mass of solute and keep volume of solution the same

Answer 6

concentration increases

Question 7

What happens when you increase the volume of solution and keep mass of solute the same

Answer 7

decrease concentration

Question 8

What is the 3-step process for working out concentration in equations

Answer 8

1. work out how many moles of known (volume * conc)
2. use molar ratio between the known and unknown
3. use moles to work out conc (moles/volume)