Mole ConceptHard
Question
The waste of nuclear power plant contains C12 and C14 in the ratio of 4: 1 by moles. What is the molecular mass of methane gas produced from this disposed waste? Given that the natural abundance of C12 and C14 are 98% and 2%, respectively.
Options
A.15.998
B.16.0053
C.16
D.16.4
Solution
Average atomic mass of carbon = $\frac{4 \times 12 + 1 \times 14}{5} = 12.4$
∴ Average molecular mass of CH4 =12.4 + 4 × 1 = 16.4
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