Calculations for all students - Edexcel

1

What is meant by the relative atomic mass of an element (also represented as the symbol Ar)?

2

What is the relative atomic mass (Ar) of aluminium? Use the periodic table to help you.

3

What is the relative formula mass (Mr) of magnesium oxide (formula MgO)? Use the periodic table to help you.

4

What is the relative formula mass (Mr) for sulfuric acid (formula H2SO4)? Use the periodic table to help you.

5

What is the empirical formula for hydrogen peroxide which has a molecular formula of H2O2?

6

The empirical formula for a compound is CH2 and its relative atomic mass (Ar) is 70. What is its molecular formula? Use the periodic table to help you.

7

If 2.8 g of nitrogen combines with 6.4 g of oxygen, what is the empirical formula of the nitrogen oxide formed? Use the periodic table to help you.

8

What does the law of conservation of mass state?

9

What mass of cobalt must have reacted if 3.20 g of oxygen forms 7.92 g of cobalt oxide?

10

What is the concentration of a solution formed by dissolving 4 g of potassium hydroxide in 200 cm3 of water?