Question

Using a periodic table, write the chemical formula and calculate the molar mass of the following: a) Cerium (IV) sulfate tetrahydrate b) Nickel (II) acetate tetrahydrate

Answer 1

1 = Cerium (IV) sulfate tetrahydrate:

Chemical Formula:

Ce(SO₄)₂ . 4H₂O

Molar mass:

Atomic mass of cesium = 133 amu

Atomic mass of sulfur =  32 amu

Atomic mass of oxygen = 16 amu

Atomic mass of hydrogen = 1 amu

Molar mass of Ce(SO₄)₂ . 4H₂O = 133+ (32+64)×2 + 4(18)

Molar mass of Ce(SO₄)₂ . 4H₂O = 133 +192+ 72

Molar mass of Ce(SO₄)₂ . 4H₂O = 397 g/mol

2 = Nickel(ii) acetate tetrahydrate

Chemical Formula:

Ni(CH₃CO₂)₂ . 4H₂O

Molar mass:

Atomic mass of Ni = 58.69 amu

Atomic mass of C =  12 amu

Atomic mass of oxygen = 16 amu

Atomic mass of hydrogen = 1 amu

Molar mass of Ni(CH₃CO₂)₂ . 4H₂O = 58.69+ (12+3+12+32)×2 + 4(18)

Molar mass of  Ni(CH₃CO₂)₂ . 4H₂O = 58.69 +118+ 72

Molar mass of  Ni(CH₃CO₂)₂ . 4H₂O = 248.69 g/mol