Molar Mass of Hg(NO3)2 (Mercuric Nitrate): Step by Step

What is the molar mass of Hg(NO₃)₂?

Answer

M(Hg(NO₃)₂) ≈

324.60 g/mol

Atomic weights: IUPAC standard values (CIAAW, 2024); the sum is rounded to the decimal places of the least precise one — Hg: 200.59.

Hg(NO₃)₂ = Hg + 2 × (N + 3 O) → Hg 1, N 2, O 6

Contribution of each element
Element	Atoms, n	Atomic weight, A	n × A, g/mol Mass fraction, w	Mass fraction, w
Hgmercury	1	200.59	200.59 w ≈ 61.80%	≈ 61.80%
Nnitrogen	2	14.007	28.014 w ≈ 8.63%	≈ 8.63%
Ooxygen	6	15.999	95.994 w ≈ 29.57%	≈ 29.57%
Σ = 324.598 ≈ 324.60 g/mol w = 100%				100%

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Formula	M, g/mol
C₁₆H₁₈ClN₃S (methylene blue)	319.85
Na₂SO₄·10H₂O (sodium sulfate decahydrate)	322.19
PbCrO₄ (lead(II) chromate)	323.2
Hg(NO₃)₂ (mercuric nitrate)	324.60
(CH₃COO)₂Pb (lead(II) acetate)	325.3
CCs₂O₃ (cesium carbonate)	325.83
Pb(NO₃)₂ (lead(II) nitrate)	331.2