221k views
3 votes
WHAT IS MASS OF OXYGEN IN A 54g sample of di nitrogen penta oxide ​

1 Answer

3 votes
The chemical formula for dinitrogen pentoxide is N₂O₅. The formula indicates that in one mole of N₂O₅, there are five moles of oxygen atoms.

Calculate the moles of N₂O₅ in 54 g.

n = m/M; where n = moles, m = mass (g), and M = molar mass (g/mol).

m(N₂O₅) = 54 g N₂O₅

M(N₂O₅) = (2×14 g/mol N) + (5×16 g/mol O) = 108 g N₂O₅/mol N₂O₅

n(N₂O₅) = 54 g N₂O₅/108 g N₂O₅/mol N₂O₅ = 0.50 mol N₂O₅

Calculate the moles of O in 0.50 mol N₂O₅.

0.50 mol N₂O₅ × 5 mol O/1 mol N₂O₅ = 2.5 mol O

Calculate the mass of 2.5 mol O.

m = n × M

n(O) = 2.5 mol O

M(O) = 16 g O/mol O

m(O) = 2.5 mol O × 16 g O/mol O = 40. g O to two significant figures

There are 40. g of oxygen in 54 g of dinitrogen pentoxide.
User Idmitriev
by
9.1k points

Related questions

asked Apr 8, 2019 25.1k views
Svestka asked Apr 8, 2019
by Svestka
8.0k points
2 answers
4 votes
25.1k views
asked Oct 7, 2022 103k views
Shubster asked Oct 7, 2022
by Shubster
8.2k points
2 answers
4 votes
103k views