Snapquiz - Empirical Formula

Question 1. What's the next step once you've found the mass in grams of an element in your compound and its A_r value?

Find the ratio of the mass to the A_rDivide the mass by the A_r value.
Find the ratio of the A_r values to each other.
Subtract the A_r value from the mass.

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

C₂H₄
CH
C₄H₈
CH₂

Question 3. How would you find the mass increase due to oxygen in the oxidation of magnesium?

Subtract the mass before oxidation from the mass after oxidation.
Find the ratios of the masses before and after oxidation.
Add the masses before and after oxidation together.
Subtract the mass after oxidation from the mass before oxidation.

Question 4. If a compound has a 1:2 ratio of carbon atoms to oxygen atoms, what is its chemical formula?

CO.
OC₂.
CO₂.
C₂O.

Question 5. Which is the correct sequence of values to calculate to find the empirical formula?

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

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