4.3.2 Use of amount of substance in relation to masses of pure substances

Question 1

What is Avogadro’s Constant?

Answer 1

6.022*10^23

Question 2

Number of particles =

Answer 2

moles * Avogadro’s Constant

Question 3

moles =

Answer 3

mass/Mr

Question 4

What is yield?

Answer 4

Your return, how much is obtained as a percentage

Question 5

Compare theoretical and experimental mass.

Answer 5

Theoretical mass is the maximum mass of a product that can be obtained.
Experimental mass is what you actually get in practice by doing the experiment

Question 6

What equation relates concentration to volume? Give both equations for this

Answer 6

concentration = moles / volume (dm^3)

concentration = mass (g) / volume (dm^3)

Question 7

How can you switch between the two conc to vol equations?

Answer 7

To switch from mass to moles you can multiply the concentration by the Mr. To switch back you then divide by Mr.

Question 8

True or False: ml = cm^3 & dm^3 = l

Answer 8

True

Question 9

Define Concentration

Answer 9

The number of moles per unit volume