Answer:
NO2
Explanation:
Molar mass of Nitrogen (N) is 14g/ mole . Molar mass of O is 16g/ mol. So the ratio of atoms of each is :
Moles of O = mass of O / Molar mass O = 12 / 16 = 0.75 = 3/4 mole of O
Moles of N = mass of N / Molar mass N = 7 / 14 = 0.5 = 1/2 mole of N
So to scale these fractions to a whole number, multiply both by 4.
4 x 3/4 = 3 moles of O; 4 x 1/2 = 2 moles of N. This confirms your first answer: N2O3.
Do the same for the ratio 16:7.
Moles O: 16 / 16 = 1 mole of O
Moles of N: 7 / 14 = 1/2 mole of N
This means for each 1/2 mole of N we have 1 mole of O; or for each mole of N we have 2 moles of O : the ratio is 2.
Multiplying both by 2: N = 1 mole; O = 2 moles. So the molecule is NO2.
