An oxide of nitrogen is 26 percent nitrogen by mass. The molar mass of the oxide is approximately 105 g/mol. What is the formula of the compound?

Answer 1

Oxide is just an element + Oxygen

For 1 mol of oxide will have 0.26 (26%) N, so:

0.26*105=27.3 g of N

0.74*105=77.7 g of O

For Nitrogen:

n = m/M

n=27.3/14

n=1.95

n∼2

For Oxygen:

n=m/M

n=77.7/16

n=4.86

n∼5

Hence, your oxide is

N₂O₅