Molar and molecular weight of KH2PO4

• Molecular formula: KH2PO4 or H2KO4P
• Relative molecular weight of KH2PO4: 136.085542
• Molar mass of KH2PO4: 136.085542 g/mol (0.13609 kg/mol)

Calculation of the relative molecular and molar mass of KH2PO4

• Mr[KH2PO4] = Ar[H] * 2 + Ar[K] + Ar[O] * 4 + Ar[P] = 1.00794 * 2 + 39.0983 + 15.9994 * 4 + 30.973762 = 136.085542
• Molar mass (kg/mol) = Mr[KH2PO4] : 1000 = 136.085542 : 1000 = 0.13609 kg/mol

KH2PO4: percent composition by element

• Hydrogen (H) = 2.01588 : 136.085542 * 100 = 1.481 %
• Potassium (K) = 39.0983 : 136.085542 * 100 = 28.731 %
• Oxygen (O) = 63.9976 : 136.085542 * 100 = 47.027 %
• Phosphorus (P) = 30.973762 : 136.085542 * 100 = 22.761 %

Molar mass calculator