Moles

Question 1

What is the Mr

Answer 1

The relative formula mass is obtained by adding up the relative atomic mass of all the atoms in the formula

e.g Mg = 24

Question 2

How big is a mole

Answer 2

6 x 10 to the 23

Question 3

If we have only one mole of any element, then we know the mass we have is the……..mass of that element

Answer 3

Relative atomic

e.g Mr Carbon = 12, 1 mole of carbon = 12

Question 4

What equation links mass, moles and relative formula mass

Answer 4

Mass = moles x relative formula mass

Question 5

How would you find the amount of moles if yu have the mass and relative formula mass

Answer 5

Moles = mass ÷ relative formula mass

Question 6

How would you find the relative formula mass if you had the mass and the amount of moles

Answer 6

Relative formula mass = mass ÷ moles

Question 7

What is the equation that links percentage yield, actual mass of products and theoretical mass of product

Answer 7

Percentage yield = actual mass of product ÷ theoretical mass of product

Question 8

Give some reasons on why reactions don’t give a 100% yield

Answer 8

Solids might get lost due to dust or smoke

Solutions or solids might be left in apparatus as they are poured form one piece to another

Liquids might evaporate

The chemicals might not react completely yet

The reaction might be reversible and in dynamic equilibrium

Question 9

What does 1dm3 =

Answer 9

1000cm3

Question 10

What equation gives you the volume from the amount of moles

Answer 10

Volume = Amount (moles) x 24,000