A1 - Moles and Concentration Calculations

Question 1

What equation is used to calculate moles using concentration and volume?

Answer 1

moles = concentration x volume

Question 2

Which unit of volume is used to calculate moles?

Answer 2

dm3

Question 3

how is cm3 converted to dm3?

Answer 3

÷ 1000

Question 4

what are the two units of concentration?

Answer 4

moldm-3 and gdm-3

Question 5

What equation is used to calculate volume using concentration and moles?

Answer 5

volume = moles ÷ concentration

Question 6

What equation is used to calculate concentration using volume and moles?

Answer 6

concentration = moles÷ volume

Question 7

Calculate the number of moles of H2SO4 in 50 cm3 of a 0.50 moldm-3 solution.

Answer 7

moles = concentration x volume
= 0.05 x (50÷1000)
= 0.0025

Question 8

Calculate the number of moles in 25.0cm3 of 0.102moldm-3 NaOH

Answer 8

moles = concentration x volume
= 0.102 x (25÷1000)
=2.55x10-3

Question 9

Calculate the number of moles in 26.0cm3 of 0.220 moldm-3 sulfuric acid

Answer 9

moles = concentration x volume
= 0.220 x (26÷1000)
= 5.72x10-3

Question 10

Calculate the number of moles in FeSO4 in 25 cm3 of a 0.2 moldm-3 solution

Answer 10

moles = concentration x volume
= 0.2 x (25÷1000)
= 2.5x10-3

Question 11

What is the molar concentration of 0.01 moles of H2SO4 in 250 cm3 of solution

Answer 11

concentration = moles÷ volume
= 0.01 ÷ (250÷1000)
= 0.04 moldm-3

Question 12

What is the concentration of 0.09 moles of CuSO4 in 250 cm3 of solution in
mol dm-3

Answer 12

concentration = moles÷ volume
= 0.09 ÷ (250÷1000)
= 0.36 moldm=3

Question 13

Calculate the concentration of
0.400 moles of HCl in 25.0 cm3 of solution in
mol dm-3

Answer 13

concentration = moles÷ volume
= 0.4 ÷ (25÷1000)
= 16 moldm=3

Question 14

what is the concentration in gdm-3 of 1.06g of H2SO4 in 250 cm3 of solution

Answer 14

1.06g ÷ (250÷1000)
= 4.24 gdm-3

Question 15

what is the concentration in gdm-3 of 15.0 g of CuSO4 in 250 cm3 of solution

Answer 15

15g ÷ (250÷1000)
60 gdm-3

Question 16

Calculate the concentration of the following in g dm-3.
16 moldm-3 of HCl.

Answer 16

gdm-3 = moldm-3 x Mr
= 16 x 36.5
= 584 gdm-3