Empirical Stoichiometry

Which of the following statements is the correct definition of an empirical formula?

• It is a formula that calculates the coefficients of a compound in a balanced equation.

• It is the simplest or lowest whole-number ratio of moles of elements in the compound.

• It is the whole number ratio of moles of elements in the compound.

• It is the number ratio of moles of elements in the compound.

What is the empirical formula of the following molecular formula: C₃H₆

• C₃H₆

• CH₂

• C₂H₄

• CH₃

Which of the following formulas represents an empirical formula?

• H₂O₂

• C₂H₆O₁₂

• CaCl₂

• N₂O₈

Which pair has the same empirical formula?

• NaCrO₄ and Na₂Cr₂O₇

• C₂H₄O₂ and C₆H₁₂O₆

• C₃H₆O₃ and C₂H₆O₂

• CH₄ and C₂H₆

A compound came out with the following ratio:

3 Carbon to 1.49 Phosphorus to 2 Oxygen. Which of the following is the correct empirical formula?

• Ca₆P₃O₄

• C₃PO₂

• C₆P₃O₄

• C₃P₃O₂

A compound came out with the following ratio:

1.5 Carbon to 2.25 Phosphorus to 3 Oxygen. Which of the following is the correct empirical formula?

• C₆P₃O₄

• C₆P₉O₁₂

• C₂P₂O₃

• C₃P₅O₆

Using the following equation:

Fe₂O₃(s) + 3H₂(g) → 2Fe(s) + 3H₂O(l)

How many moles of iron can be made from 6 moles H₂?

• 4 moles Fe

• 6 moles Fe

• 9 moles Fe

• 2 moles Fe

Using the following equation:

Fe₂O₃(s) + 3H₂(g) → 2Fe(s) + 3H₂O(l)

How many moles of water can be made from 2.0 moles H₂?

• 4 moles H2O

• 6 moles H2O

• 9 moles H2O

• 2 moles H2O

• 3 moles H2O

If a chemist calculates the maximum amount of product that could be obtained in a chemical reaction, he or she is calculating the

• theoretical yield

• mole ratio

• actual yield

• percentage yield

When a chemist measures the actual amount of product that was obtained in a chemical reaction, he or she is measuring the

• theoretical yield

• mole ratio

• actual yield

• percentage yield