Question

How many O2 molecules are needed to react with 8.69 g of S?
Express your answer numerically in units of molecules.

Answer 1

Explanation:

Elemental S reacts with O2 to form SO3 according to the reaction:

2S+3O2→2SO3

How many O2 molecules are needed to react with 5.27 g of S?

Express your answer numerically in units of molecules.

=????molecules

Part B

What is the theoretical yield of SO3 produced by 5.27 g of S?

Express your answer numerically in grams.

= ???g

Subtitle: Limiting reactant

Next, consider a situation in which all of the S is consumed before all of the O2 reacts, or one in which you have excess S because all of the O2 has been used up.

For each of the given situations, indicate whether S or O2 is the limiting reactant.

A) 3.0 mol Sulfur & 5.0mol oxygen

B)3.0 mol sulfur & 4.0 mol oxygen

C) 3.0 mol sulfur & 3.0 mol oxygen