Chemistry - Mole Concept Question with Solution | TestHub
Statement-1: When of a hydrocarbon undergoes complete combustion, it produces of and of . The empirical formula of the hydrocarbon is .
Statement-2: The molecular formula of a compound can be determined if its empirical formula and molar mass are known.
Options:
Answer:
Solution:
Statement-1:
Mass of C in CO₂ =
Mass of H in H₂O =
Total mass of C and H = .
This does not match the given hydrocarbon.
If we use the calculated masses, moles of C = mol. Moles of H = mol.
Ratio C:H = . Empirical formula is C₃H₈, not CH₃. So, Statement-1 is false.
Statement-2: The molecular formula is a multiple of the empirical formula. If the empirical formula and molar mass are known, the molecular formula can be determined by finding the integer 'n' such that (Empirical Formula Mass) = Molar Mass. So, Statement-2 is true.
Therefore, Statement-1 is false and Statement-2 is true.
