The molar mass of a substance is 92.010g. The substance is 30.4% nitrogen and 69.9% oxygen. What is the empirical formula and the molecular formula of the substance

Empirical formula = NO₂

Molecular formula = N₂O₄

Explanation:

Percentage mass of Nitrogen = 30.4 %

Percentage mass of Oxygen = 60.9 %

Mole ratio of the elements:

Nitrogen = 30.4/14 = 2.17

Oxygen = 69.9/16 = 4.37

Dividing by the smallest ratio to obtain a simple ratio

Nitrogen: 2.17/2.17 = 1

Oxygen; 4.37/2.17 = 2

Therefore, the simplest mole ratio is 1:2

Empirical formula = NO₂

Molecular formula = n(empirical formula), therefore, molecular mass = n *(empirical mass)

92.010 = n(14 + 32)

92.010 = 46n

n = 92.010/46

n = 2

Therefore, molecular formula = 2(NO₂)

Molecular formula = N₂O₄

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.