Type any chemical formula — brackets and hydrates such as Ca(OH)2 or CuSO4.5H2O included — to get its molar mass and percentage composition by element.
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From the article How to Calculate Molar Mass — Step-by-Step with Examples.
H: 2 × 1.008 = 2.016
O: 1 × 15.999 = 15.999
M(H₂O) = 2.016 + 15.999 = 18.015 ≈ 18.02 g/mol
C: 1 × 12.011 = 12.011
O: 2 × 15.999 = 31.998
M(CO₂) = 12.011 + 31.998 = 44.009 ≈ 44.01 g/mol
K: 2 × 39.098 = 78.196
Cr: 2 × 51.996 = 103.992
O: 7 × 15.999 = 111.993
M(K₂Cr₂O₇) = 78.196 + 103.992 + 111.993 = 294.18 g/mol
Worked in full in How to Calculate Molar Mass — Step-by-Step with Examples.
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