Calculate molar mass (calculate molecular weight, Molar Mass Calculator).Formula:K4Cr2O9 -- e-Tools Age

	Calculate molar mass
	Enter a chemical formula in the field below, pay attention to formula is case sensitive!!!	The formula should be entered as: H₂SO₄= H2SO4 CuSO₄.5H2O=CuSO4.5H2O 3BeO.Al2O₃.6SiO₂= (BeO)3.Al2O3.6SiO2

Calculations:
Formula: K4Cr2O9
Molar Mass: 404.375 g/mol        1g=2.47295208655332E-03 mol
Percent composition (by mass):
Element  Count           Atom Mass                %(by mass)
K                  4                  39.098                        38.67%
Cr                2                  51.996                        25.72%
O                  9                  15.999                        35.61%

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