GCSE Chemistry - Moles, Concentration & Volume Calculations #29

The video tutorial explains the relationship between moles, concentration, and volume in chemistry. It covers the units used for these measurements and provides examples of calculating moles and concentration. A more complex scenario is presented, involving the calculation of an unknown concentration using molar ratios and given volumes. The tutorial emphasizes the importance of converting units and understanding molar ratios to solve chemistry problems effectively.

What is the unit of concentration typically used in chemistry?

• Liters per mole

• Grams per liter

• Moles per decimeter cubed

• Moles per liter

If you have 800 cm³ of a solution with a concentration of 0.2 moles per dm³, how many moles are present?

• 0.16 moles

• 0.08 moles

• 0.2 moles

• 0.4 moles

How do you convert volume from centimeters cubed to decimeters cubed?

• Multiply by 1000

• Divide by 1000

• Divide by 100

• Multiply by 100

In a reaction, if 30 cm³ of 0.5 mol/dm³ potassium hydroxide reacts with 25 cm³ of sulfuric acid, what is the first step to find the concentration of sulfuric acid?

• Calculate the moles of sulfuric acid

• Calculate the moles of potassium hydroxide

• Find the molar ratio

• Convert volumes to decimeters cubed

What is the molar ratio of potassium hydroxide to sulfuric acid in the given reaction?

• 1:1

• 3:1

• 2:1

• 1:2

After finding the moles of potassium hydroxide, what is the next step in solving for the concentration of sulfuric acid?

• Calculate the moles of sulfuric acid

• Convert the moles to grams

• Find the molar mass of sulfuric acid

• Calculate the volume of sulfuric acid

What is the final concentration of sulfuric acid in the reaction?

• 0.3 moles per dm³

• 0.4 moles per dm³

• 0.6 moles per dm³

• 0.5 moles per dm³