A sample of a compound contains 1.52g of nitrogen and 3.47g of oxygen the molar mass of this is between 90g ,Determine the molecular formula and calculate the molar mass of a compound

Answer 1

To determine the molecular formula and calculate the molar mass of the compound, we need to find the empirical formula first.

Step 1: Determine the number of moles of each element.
moles of nitrogen = 1.52g / atomic mass of nitrogen = 1.52g / 14g/mol = 0.1086 mol
moles of oxygen = 3.47g / atomic mass of oxygen = 3.47g / 16g/mol = 0.2169 mol

Step 2: Determine the ratio of the elements.
Divide the moles of each element by the smallest number of moles.
Nitrogen: 0.1086 mol / 0.1086 mol = 1
Oxygen: 0.2169 mol / 0.1086 mol = 1.999

Since the ratio is close to 2:1, we assume the empirical formula is N2O.

Step 3: Calculate the molar mass of the empirical formula.
molar mass of N2O = (atomic mass of nitrogen x 2) + atomic mass of oxygen
= (14g/mol x 2) + 16g/mol
= 28g/mol + 16g/mol
= 44g/mol

Therefore, the empirical formula is N2O and the molar mass of the compound is 44g/mol.