Work out the formula

Exercise and reference answers

Questions

1. Hint

   mass over Ar

   Answer

   1.5

   Question

   36 g of magnesium, Ar = 24. Moles?

2. Hint

   mass over Ar

   Answer

   1

   Question

   14 g of nitrogen, Ar = 14. Moles?

3. Hint

   double both sides

   Answer

   3

   Question

   Ratio 1.5 to 1 as whole numbers: magnesium atoms?

4. Hint

   two plus ones and four minus twos must balance

   Answer

   6

   Question

   Oxidation state of sulphur in H2SO4?

Instructions

Convert masses to moles and key in each answer.