Answer:
Concentration = 1.32 m
Boiling point = 
Explanation:
Let the boiling point of two solutions = T
Let the molal concentration of the two solutions= m
The relation between elevation in boiling point and molal concentration is:

i) For benzene

....(1)
ii) For carbon tetrachloride

...(2)
Equating the two equations:

Putting value of "m" in equation "1"

Answer:
Oxygen and Magnesium together, OMg?!?!
CaCO₃ → CaCl₂
Ca = 40, C = 12, O = 16, Cl = 35.5
100 →111
3 → x
x = 3.33g
nitrogen-14, which makes up the vast majority of naturally occurring nitrogen, and nitrogen-15, which is less common.