Chemical Calculations

Question 1

How is relative atomic mass found?

Answer 1

By finding the mass in the periodic table.

Question 2

How is relative formula mass calculated?

Answer 2

By adding the atomic masses in the formula.

Question 3

How do you work out concentration, given moles and mass?

Answer 3

Moles / mass

Question 4

What equation links moles, concentration and volume?

Answer 4

Moles = concentration x volume

Question 5

How do you calculate concentration, given moles and volume?

Answer 5

Moles / volume

Question 6

How do you work out the mass of a reactant, given the mass of the other?

Answer 6

1) Find the Mr of both reactants, moles timesed.
2) Divide the Mr of the reactant by the Mr of the reactant with given mass.
3) Times this by the given mass.

Question 7

How do you work out the mass of a product, given the mass of a reactant?

Answer 7

1) Find the Mr for the product and the reactant with given mass.
2) Divide the Mr of the product by the Mr of the reactant.
3) Times it by the given mass.

Question 8

How do work out the volume of a gas at room temperature?

Answer 8

Number of moles x 24