Molar Mass of Ca(OH)2 (Calcium Hydroxide)

Molar Mass Calculator

What is the molar mass of Ca(OH)₂?

Answer

M(Ca(OH)₂) =

74.092 g/mol

Atomic weights: IUPAC standard values (CIAAW, 2024).

Ca(OH)₂ = Ca + 2 × (O + H) → Ca 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
Cacalcium	1	40.078	40.078 w ≈ 54.09%	≈ 54.09%
Ooxygen	2	15.999	31.998 w ≈ 43.19%	≈ 43.19%
Hhydrogen	2	1.0080	2.0160 w ≈ 2.72%	≈ 2.72%
Σ = 74.092 g/mol w = 100%				100%

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

Mass fractions of the elements

Ca 54.09%O 43.19%

H 2.72%

Related Calculations

See Also

Liters to Kilograms - How many kilograms are in a liter of water, honey, gasoline, sand and other substances — by density
Grams to Kg - Convert Grams to Kilograms
Percentage Calculator: Fraction to Percent - What percentage one number is of another? Convert fraction into a percentage
Scientific Calculator with Memory & History - Free Engineering Calculator Online with Memory Function, Operation History, Logarithms & Trigonometry. Similar to ti-83, ti-84, ti-89

Recalculate with different values ↑

Molar masses of substances nearby

Formula	M, g/mol
C₄H₁₁N (diethylamine)	73.139
Li₂CO₃ (lithium carbonate)	73.89
C₃H₆O₂ (propionic acid)	74.079
Ca(OH)₂ (calcium hydroxide)	74.092
CH₃CH₂OCH₂CH₃ (diethyl ether)	74.123
NaOCl (sodium hypochlorite)	74.44
KCl (potassium chloride)	74.55

FAQ

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

M(Ca(OH)₂) = 74.092 g/mol

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

Add up the atomic weights of all the atoms in the formula: 40.078 + 2 × 15.999 + 2 × 1.0080 = 74.092 g/mol.

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

m = n × M = 2 mol × 74.092 g/mol = 148.184 g.

See Also