How can an empirical formula be interpreted?
1 Answer
For example, a question has been given to you.
Example question: Calculate the empirical formula of a compound that contains 11% hydrogen and 89% oxygen by mass.
First step:
Assume that percentages are masses.
Assume that 100 grams contains 11 grams of hydrogen and 89 grams of oxygen.
Second step:
Use the formula
The number of moles (n) in hydrogen is:
n = 11 grams
The number of moles (n) in oxygen is:
n = 89 grams
Third step:
Divide all number of moles (n) by the SMALLEST, then round to nearest whole number.
Hydrogen (H): 11 moles
Oxygen (O): 5.6 moles
Last step:
Round to whole numbers, and assign as subscripts.
The empirical formula of this compound is