Calculate molar mass (calculate molecular weight, Molar Mass Calculator).Formula:(HAsO4)-2 -- 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: (HAsO4)-2
Molar Mass: 137.9255 g/mol        1g=7.25029091792308E-03 mol
Percent composition (by mass):
Element  Count           Atom Mass                %(by mass)
H                  -1                1.0079                        -0.72%
As                1                  74.9216                       52.87%
O                  3.9              15.999                        44.95%

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