Answer:
c. 0.30
Explanation:
One C atom has a mass of 12.0 u and one Ar atom has a mass of 40.0 u.
Let’s assume that there are <em>n</em> atoms of C and <em>n</em> atoms of Ar. Then
Mass of <em>n</em> C atoms = <em>n</em> × 12.0
Mass of <em>n</em> C atoms = 12.0<em>n</em> u
Mass of <em>n</em> Ar atoms = <em>n</em> × 40.0
Mass of <em>n</em> Ar atoms = 40.0<em>n</em> u
ratio = mass of C/mass of Ar
ratio = 12.0<em>n</em>/40.0<em>n
</em>
ratio = 0.300