Snapquiz - Empirical Formula

This is the Snapquiz on Empirical Formula. Click here or use the embedded video if you haven't watched the lesson yet.

Question 1. A carbon oxide is found to have a 1:1 ratio of carbon to oxygen. What is its correctly-written empirical formula?


Question 2. Butene contains four carbon atoms and eight hydrogen atoms. What is its empirical formula (not its molecular formula)?


Question 3. What's the next step once you've found the mass in grams of an element in your compound and its Ar value?

Find the ratio of the mass to the ArDivide the mass by the Ar value.
Subtract the Ar value from the mass.
Find the ratio of the Ar values to each other.

Question 4. Which is the correct sequence of values to calculate to find the empirical formula?

Ratio, Ar values, Masses, Division.
Ar values, Division, Ratio, Masses.
Division, Masses, Ar values, Ratio.
Masses, Ar values, Division, Ratio.

Question 5. 89.2g of lead oxide is heated with carbon, which reduces it (removes its oxygen). Afterwards 82.8g of pure lead is left. How would we find the mass of oxygen lost?

89.2g - 82.8g
Simplify the ratio 89.2 : 82.8
Divide both values by Ar values.
82.8g - 89.2g

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