quantitative Chemistry, easy

Question 1

What is the molecular mass of NaOH?

Answer 1

40

Question 2

How many moles are there in 88g of CO2?

Answer 2

2 moles

Question 3

What is the molecular mass of Fe2O3?

Answer 3

160

Question 4

How many moles are there in 180 g of water?

Answer 4

10 moles

Question 5

How many dm3 are there in 23cm3?

Answer 5

0.023dm3

Question 6

The concentration of a potassium sulphate solution (K2SO4) is 0.25moles/dm3. How many moles would there be in 80cm3?

Answer 6

0.02 moles

Question 7

What is the formula linking concentration, volume and number of moles?

Answer 7

n = c x V

Question 8

What is the formula linking molecular mass, moles and mass?

Answer 8

m = Mr x n

Question 9

What is the formula linking number of moles, volume of a gas and molar volume(24 dm3/mole)?

Answer 9

V = n x 24

Question 10

Substance x has a mass of 45g and contains 1.5 moles. What is its molecular mass?

Answer 10

30

Question 11

How many moles are there in 200g of substance y with a molecular mass of 40?

Answer 11

5 moles

Question 12

What is the volume of a gas that has 0.1 moles in a sealed container. (molar volume = 24 dm3/mole)?

Answer 12

2.4 dm3

Question 13

What is the concentration of a solution which contains 0.15 moles of a substance dissolved in 0.06dm3 of water?

Answer 13

2.5moles/dm3

Question 14

Into which volume would you dissolve 25 moles a substance z to make a concentration of 2moles/dm3?

Answer 14

12.5dm3