Calculate molar mass (calculate molecular weight, Molar Mass Calculator).Formula:Na2S2O4.7H2O -- 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: Na2S2O4.7H2O
Molar Mass: 300.1992 g/mol        1g=3.33112146867813E-03 mol
Percent composition (by mass):
Element  Count           Atom Mass                %(by mass)
Na                2                  22.9898                       15.32%
S                  2                  32.06                         21.36%
O                  11                15.999                        58.62%
H                  14                1.0079                        4.7%

Top Use: Molar Mass Calculator Formula: Co2(Cr2O7)3 Recent user inquiry: 6/13/2026 20:54Molar Mass Calculator Formula: NaS3 6/13/2026 20:54Molar Mass Calculator Formula: Ni2 6/13/2026 20:53Molar Mass Calculator Formula: n2s2o3 6/13/2026 20:53Molar Mass Calculator Formula: C4H8O 6/13/2026 20:53Molar Mass Calculator Formula: B203