Relative Formula Mass and Calculations

Question 1

what is the relative atomic mass?

Answer 1

The relative formula mass is the top number in the periodic table, it shows how heavy the different atoms are

Question 2

what is the relative formula mass?

Answer 2

Relative formula mass is the relative atomic masses added together

Question 3

how do you work out the number of moles?

Answer 3

Mass in grams divided by the relative formula mass

Question 4

how do you work out the percentage mass?

Answer 4

relative atomic mass * NO. of atoms
………………………………………..* 100
Relative formula mass

Question 5

how do you work out the mass in a reaction?

Answer 5

1. Write out the balanced equation
2. Work out the relative formula masses
3. Divide to get one g, then times to get the amount you want

Question 6

how do you work out the percentage yield?

Answer 6

Actual yield (grams) divided by predicted yield (grams) multiplied by 100