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OCR A-level Chemistry Concentration and moles

Concentration and moles

This page covers the following topics:

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

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How many moles in 4.515 x 10Β²Β³ atoms of a substance?

OCR A-level Chemistry Concentration and moles How many moles in 4.515 x 10Β²Β³ atoms of a substance?
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2

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What is the number of moles in 40g of Calcium?

OCR A-level Chemistry Concentration and moles What is the number of moles in 40g of Calcium?
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3

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8 g of NaOH is dissolved in 2 dmΒ³ water. What is the concentration of this solution?

OCR A-level Chemistry Concentration and moles 8 g of NaOH is dissolved in 2 dmΒ³ water. What is the concentration of this solution?
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4

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Convert 20 cmΒ³ into dmΒ³.

OCR A-level Chemistry Concentration and moles Convert 20 cmΒ³ into dmΒ³.
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5

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You are making a solution of NaOH has a concentration of 5 g/dmΒ³. What is the mass of NaOH you'd need to dissolve in 2 dmΒ³ water?

OCR A-level Chemistry Concentration and moles You are making a solution of NaOH has a concentration of 5 g/dmΒ³. What is the mass of NaOH you'd need to dissolve in 2 dmΒ³ water?
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6

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Convert 30 ml into dmΒ³.

OCR A-level Chemistry Concentration and moles Convert 30 ml into dmΒ³.
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7

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

OCR A-level Chemistry Concentration and moles 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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8

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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?

OCR A-level Chemistry Concentration and moles 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?
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