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
b)kilograms.

(Amu of carbon = 14, Amu of oxygen = 16)

See attachment below.

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...rbon atom and two oxygen atoms. Calculate its
mass in (a) atomic mass units (b) kilograms.
Answer :
(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 ...