Question

Mole concept class 11 problems on pedicle formula molecular formula and percent composition

Answer 1

Answer:

1. Molecular Formula: Divide the molar mass of the compound by the empirical formula mass. The result should be a whole number or very close to a whole number. Multiply all the subscripts in the empirical formula by the whole number found in step 2. The result is the molecular formula.
2. Percent Composition: The subscripts in the formula are first used to calculate the mass of each element in one mole of the compound. That is divided by the molar mass of the compound and multiplied by 100%. The percent composition of a given compound is always the same as long as the compound is pure.
3. Empirical Formula and Molecular Formula: Molecular formulas tell you how many atoms of each element are in a compound, and empirical formulas tell you the simplest or most reduced ratio of elements in a compound. If a compound's molecular formula cannot be reduced any more, then the empirical formula is the same as the molecular formula.