Precision and Significant Figure Calculations
The answer should not contain more significant figure than the question.
A carbon dioxide molecule contains a carbon atom and two oxygen atoms. Calculate its mass in:
a) atomic mass units
(Amu of carbon = 14, Amu of oxygen = 16)
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...rbon atom and two oxygen atoms. Calculate its
mass in (a) atomic mass units (b) kilograms.
(a) The atomic mass unit for carbon is given as 14amu and that of oxygen as 16amu.
∴ the mass of carbon dioxide is 12 + (16 × 2) = 44amu
Note, periodic tables often quote the amu of elements much more ...