Molar mass of potassium alum (KAl(SO4)2·12H2O)

The molar mass of potassium alum (KAl(SO4)2·12H2O) is 474.372 g/mol.

alum · potassium aluminium sulfate

Step-by-step calculation

ElementAtomsAtomic massSubtotal
Potassium × 1 39.098 = 39.098
Aluminum × 1 26.982 = 26.982
Sulfur × 2 32.06 = 64.12
Oxygen × 20 15.999 = 319.98
Hydrogen × 24 1.008 = 24.192
Total474.372 g/mol

Percent composition by element

  • Potassium 8.24%
  • Aluminum 5.69%
  • Sulfur 13.52%
  • Oxygen 67.45%
  • Hydrogen 5.1%

Try another formula

H2O NaCl CO2 C6H12O6 H2SO4 Ca(OH)2 CuSO4·5H2O C8H10N4O2

Could not read that formula

Related compounds

H2SO4 Sulfuric acid KOH Potassium hydroxide CuSO4·5H2O Copper(II) sulfate pentahydrate H2SO3 Sulfurous acid K2SO4 Potassium sulfate KHC8H4O4 Potassium hydrogen phthalate

FAQ

What is the molar mass of KAl(SO4)2·12H2O?

The molar mass of potassium alum (KAl(SO4)2·12H2O) is 474.372 g/mol.

How do you calculate the molar mass of KAl(SO4)2·12H2O?

Multiply the atomic mass of each element by the number of its atoms in KAl(SO4)2·12H2O, then add the results: 1 × 39.098 (K) + 1 × 26.982 (Al) + 2 × 32.06 (S) + 20 × 15.999 (O) + 24 × 1.008 (H) = 474.372 g/mol.

What percentage of KAl(SO4)2·12H2O is Oxygen?

Oxygen makes up 67.45% of the mass of potassium alum (KAl(SO4)2·12H2O).