Molar Mass of Zn(OH)2 (Zinc Hydroxide)

Molar Mass Calculator

What is the molar mass of Zn(OH)₂?

Answer

M(Zn(OH)₂) ≈

99.39 g/mol

Atomic weights: IUPAC standard values (CIAAW, 2024); the sum is rounded to the decimal places of the least precise one — Zn: 65.38.

Zn(OH)₂ = Zn + 2 × (O + H) → Zn 1, O 2, H 2

Contribution of each element
Element	Atoms, n	Atomic weight, A	n × A, g/mol Mass fraction, w	Mass fraction, w
Znzinc	1	65.38	65.38 w ≈ 65.78%	≈ 65.78%
Ooxygen	2	15.999	31.998 w ≈ 32.19%	≈ 32.19%
Hhydrogen	2	1.0080	2.0160 w ≈ 2.03%	≈ 2.03%
Σ = 99.394 ≈ 99.39 g/mol w = 100%				100%

Atomic weights: CIAAW, Abridged Standard Atomic Weights (2024)

Mass fractions of the elements

Zn 65.78%

O 32.19%H 2.03%

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Molar masses of substances nearby

Formula	M, g/mol
C₆H₁₀O (cyclohexanone)	98.145
COCl₂ (phosgene)	98.91
CuCl (cuprous chloride)	99.00
Zn(OH)₂ (zinc hydroxide)	99.39
CrO₃ (chromium trioxide)	99.993
CaCO₃ (calcium carbonate)	100.086
KHCO₃ (potassium hydrogen carbonate)	100.114

FAQ

What is the molar mass of Zn(OH)2?

M(Zn(OH)₂) ≈ 99.39 g/mol

How to calculate the molar mass of Zn(OH)₂?

Add up the atomic weights of all the atoms in the formula: 65.38 + 2 × 15.999 + 2 × 1.0080 = 99.394 ≈ 99.39 g/mol.

How many grams are in 2 moles of Zn(OH)₂?

m = n × M = 2 mol × 99.39 g/mol = 198.78 g.

See Also