Molar Mass of Na2Cr2O7 (Sodium Dichromate)

Molar Mass Calculator

What is the molar mass of Na₂Cr₂O₇?

Answer

M(Na₂Cr₂O₇) =

261.965 g/mol

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

Contribution of each element
Element	Atoms, n	Atomic weight, A	n × A, g/mol Mass fraction, w	Mass fraction, w
Nasodium	2	22.990	45.980 w ≈ 17.55%	≈ 17.55%
Crchromium	2	51.996	103.992 w ≈ 39.70%	≈ 39.70%
Ooxygen	7	15.999	111.993 w ≈ 42.75%	≈ 42.75%
Σ = 261.965 g/mol w = 100%				100%

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

Mass fractions of the elements

O 42.75%Cr 39.70%

Na 17.55%

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Molar masses of substances nearby

Formula	M, g/mol
S₈ (octasulfur)	256.48
C₆H₅Na₃O₇ (trisodium citrate)	258.069
Ba(NO₃)₂ (barium nitrate)	261.34
Na₂Cr₂O₇ (sodium dichromate)	261.965
Mg₃(PO₄)₂ (magnesium phosphate)	262.855
AlBr₃ (aluminum bromide)	266.694
PbCO₃ (lead carbonate)	267.2

FAQ

What is the molar mass of Na2Cr2O7?

M(Na₂Cr₂O₇) = 261.965 g/mol

How to calculate the molar mass of Na₂Cr₂O₇?

Add up the atomic weights of all the atoms in the formula: 2 × 22.990 + 2 × 51.996 + 7 × 15.999 = 261.965 g/mol.

How many grams are in 2 moles of Na₂Cr₂O₇?

m = n × M = 2 mol × 261.965 g/mol = 523.930 g.

See Also