Calculating Mass And The Number Of Moles (Write On Paper If Needed)

Question 1

Calculate the number of moles present in 10g of copper sulphate (CuSO4)
(Write in paper if needed)

Answer 1

M____
N|GFM

M= 10g

N= M÷GFM, 10÷159.6= 0.06 moles

GFM= CuSO4, copper sulphate
Cu= 1x63.5g
S= 1x32.1g
O= 4x16g
=159.6g

Final answer: 0.06 moles

Question 2

Calculate the number of moles present in 10g of nickel (lll) sulphate (Ni2S3)
(Write in paper if needed)

Answer 2

M____
N|GFM

M= 10g

N= M÷GFM, 10÷213.7= 0.05 moles

GFM= Ni2S3, nickel (lll) sulphate

Ni= 2x58.7g
S= 3x32.1g
=213.7g

Final answer: 0.05 moles

Question 3

Calculate the mass of 1g moles of copper sulphate (CuSO4)
(Write in paper if needed)

Answer 3

M____
N|GFM

M= NxGFM, 1x159.6= 159.6g

N= 1g

GFM= CuSO4, copper sulphate
Cu= 1x63.5g
S= 1x32.1g
O= 4x16g
=159.6g

Final answer: 159.6g

Question 4

Calculate the mass of 5g moles of Aluminium oxide (Al2O3)
(Write in paper if needed)

Answer 4

M____
N|GFM

M= NxGFM, 5x102=510

N= 5g

GFM= Al2O3, Aluminium oxide
Al= 2x27g
O= 3x16g
=102g

Final answer: 510g