We are given with the mass of Arsine (
The mass of arsine is 15g
there is a relation between moles, mass and molar mass of any compound which is

The molar mass of Arsine = atomic mass of As + 3X atomic mass of H
the molar mass of Arsine = 74.92 + 3X 1 = 77.92 g/mol
Let us calculate the moles as

Answer:
No solution
Explanation:
36.9% w/w solution of butanoic acid in ethanol means 36.9 grams of butanoic acid per 100 grams of solution. The amount of butanoic acid in 120.0 g of the solution may be calculated:
(120.0 g solution)(36.9 g butanoic acid / 100 g solution) = 44.3 g butanoic acid.
There is not sufficient butanoic acid for the experiment.
Answer:
4( atoms of the same element always have different atomic weights)
Explanation:
the number of protons in the atoms of the same type can be different especially in isotopes
The answer for 15 is oxygen or carbon dioxide they are the same thing!
The answer for 16 is the formula of the compound and the atomic mas of its elements!
This is for if you take connections!