What is the answer to the correct number of significant figures of the following calculation? 
Definitions:
Carbon
A chemical element with symbol C, essential to all known life, capable of forming a vast number of compounds including organic compounds.
Valence Shell
The outermost shell of an atom containing the electrons most likely to participate in chemical reactions.
Neutral Solution
A solution of pH 7; there are equal concentrations of hydrogen ions [H+] and hydroxide ions [OH-]. Compare with acidic solution and basic solution.
Valence Electrons
The outermost electrons of an atom, which determine its chemical bonding properties.
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