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OCR GCSE Chemistry Concentration and moles

Concentration and moles

This page covers the following topics:

1. Moles
2. Mole ratios
3. Concentration
4. Concentration and moles

Avogadro's constant: 1 mole = 6.02 x 10Β²Β³ atoms/molecules/protons. To convert from moles to atoms (or reverse) use Avogadro's constant. Moles can also be calculated by using the pyramid (mass = moles x RFM).

Moles

The mole ratio is the ratio between the amount of moles in the compounds of a reaction. The mole ratio can be used as a conversion factor between reactants nd products, and can be worked out by looking at the coefficients in front of

Mole ratios

A solution formed when a solute dissolves in a solvent has a concentration which can be calculted by dividing the mass of dissolved dolute in g by the volume of the solution in dmΒ³ giving the concentration in g/dmΒ³.

Concentration

You can calculate the concentration in mol/dmΒ³ of a solution by calculating the moles and dividing by the volume of the solution.

Concentration and moles

1

2g of NaOH is dissolved in 2 dmΒ³ water. What is the concentration of the solution in mol/dmΒ³?

2g of NaOH is dissolved in 2 dmΒ³ water. What is the concentration of the solution in mol/dmΒ³?

2

A solution of HCl has a concentration of 8 g/dmΒ³ is made. What is the volume of water you'd need to dissolve 0.002 kg of HCl in?

A solution of HCl has a concentration of 8 g/dmΒ³ is made. What is the volume of water you'd need to dissolve 0.002 kg of HCl in?

3

You are making a solution of HCl has a concentration of 2 mol/dmΒ³. What is the volume of water you'd need to dissolve 0.5 mol NaOH in?

You are making a solution of HCl has a concentration of 2 mol/dmΒ³. What is the volume of water you'd need to dissolve 0.5 mol NaOH in?

4

Calculate the number of particles in 2 mol of a substance?

Calculate the number of particles in 2 mol of a substance?

5

200 cmΒ³ dilute HCl contains 0.25 mol dissolved hydrogen chloride. What is the concentration of the acid in mol/dmΒ³?

200 cmΒ³ dilute HCl contains 0.25 mol dissolved hydrogen chloride. What is the concentration of the acid in mol/dmΒ³?

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