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Enter a molecular formula to be calculated: Help 
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Element symbols are case-sensitive. Handle formula input with care: C, O, Co, B, I, Bi, etc.
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Both Hill notation (such as C H2 O3) and conventional formula format (such as H2CO3) are acceptable.
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Use blank space plus a dot (" .") as delimiter for separating fragments or groups of a molecule, for example,
CuSO4 .5H2O
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Only use rounded parentheses () in mulecular formula, for example, Na2(Cr2(CO)10)
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When calculating weights for ions, remove the number of charges. For example, input SF4++ or simply
SF4 instead of SF42+.
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Numbers in molecular formulas can be expressed as integer, decimal or fraction: 4CH3COOH, ZnCl2 .1.5 H2O, 1/3NH3. However,
unknown values in general formulas such as x or n of NaSiO4 .xH2O / (HBO3)n are unprocessable.
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The precision of calculation result depends on the number of significant digits of atomic weights for all elements invlolved.
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