Before 1961, an atomic mass unit scale was used whose basis was an assignment of the value 16.0000 to `.^(16)O`. The atomic mass of `.^(12)C` on this old scale is (at. Mass of oxygen on new scale = 15.9949).

Options

A. `12`
B. `11.9938`
C. `12.0038`
D. `12.1138`

Answer

C

Explanation

`("At. Mass of" .^(12)C "on old scale")/("At. Mass of" .^(16)O "on old scale")`
`=("At. Mass of" .^(12)C "on new scale")/("At. Mass of" .^(16)O "on new scale")`
`("At. Mass of" .^(12)C "on old scale")/(16.000)=(12.000)/(15.994)`
At. Mass of `.^(12)C` on old scale
`=(12.000xx16.000)/(15.9994)=12.0038`