Homework 62
- Page ID
- 31003
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Question:
- Write the empirical formula and molecular formula for the compound with the given percent composition and molecular weight.
40.0% Carbon
6.70% Hydrogen
53.3% Oxygen
Molecular Weight ≈ 240 g/mol
Solution:
Strategy:
1. Calculate amount of grams of each element we have.
2. Convert amount of grams into number of moles of each element.
3. Obtain molecular formula.
4. Find the common factor among the number of atoms each elements has, then obtain the empirical formula.
Solution:
1. Calculate amount of grams in each element:
2. Convert amount of grams into number of moles of each elements:
Carbon-
Hydrogen-
Oxygen-
3. Obtain molecular formula:
4. Find common factor and obtain empirical formula:
Common factor is 4
Empirical formula is
