Number of atoms in 12 g `._(12)^(24)Mg` is equal to

Options

A. oxygen atoms in 11 g `CO_(2)`
B. hydrogen atoms in 4 g `CH_(4)`
C. nitrogen atoms in 46 g `N_(2) O_(4)`
D. sulphur atoms in 79 g `Na_(2)S_(2) O_(3)`

Answer

A

Explanation

Number of atoms = number of molecues `xx` specific
atoms in molecules
In` {:(24),(12):}` Mg number of atom `= =12/24 xx 6.022 xx 10^(23)xx1`
`=3.011xx 10^(23)` atoms
Number of `O_(2)` atoms in 11 `CO_(2)`
`= 11/44 xx 6.022 xx 10^(23)xx2`
`=3.011 xx 10^(23)` atoms