Molar Mass of K2Cr2O7 (Potassium Dichromate)

Molar Mass Calculator

What is the molar mass of K₂Cr₂O₇?

Answer

M(K₂Cr₂O₇) =

294.181 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
Kpotassium	2	39.098	78.196 w ≈ 26.58%	≈ 26.58%
Crchromium	2	51.996	103.992 w ≈ 35.35%	≈ 35.35%
Ooxygen	7	15.999	111.993 w ≈ 38.07%	≈ 38.07%
Σ = 294.181 g/mol w = 100%				100%

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

Mass fractions of the elements

O 38.07%Cr 35.35%

K 26.58%

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Molar masses of substances nearby

Formula	M, g/mol
CaWO₄ (calcium tungstate)	287.91
C₁₂H₂₅NaO₄S (sodium lauryl sulfate)	288.38
CaI₂ (calcium iodide)	293.88
K₂Cr₂O₇ (potassium dichromate)	294.181
HgSO₄ (mercuric sulfate)	296.65
BaBr₂ (barium bromide)	297.14
SbCl₅ (antimony pentachloride)	299.01

FAQ

What is the molar mass of K2Cr2O7?

M(K₂Cr₂O₇) = 294.181 g/mol

How to calculate the molar mass of K₂Cr₂O₇?

Add up the atomic weights of all the atoms in the formula: 2 × 39.098 + 2 × 51.996 + 7 × 15.999 = 294.181 g/mol.

How many grams are in 2 moles of K₂Cr₂O₇?

m = n × M = 2 mol × 294.181 g/mol = 588.362 g.

See Also