The Mole Concept and Stoichiometry

What conversion factor is used to convert between grams and moles?

How many grams of NaCl are present in 2.0 moles?

Calculate the number of moles in 50.0 grams of $CaCO_3$.

What is the percent composition by mass of carbon in $C_6H_{12}O_6$?

In a reaction, the theoretical yield of a product is 25.0 grams, but only 20.0 grams are actually obtained. What is the percent yield?

Given the balanced equation $2H_2 + O_2 ightarrow 2H_2O$, if 4 moles of $H_2$ react, how many moles of $H_2O$ are produced?

What is the molar mass of $K_2Cr_2O_7$?

If you have 10.0 grams of $H_2$ and 8.0 grams of $O_2$, which is the limiting reactant in the formation of water ($2H_2 + O_2 ightarrow 2H_2O$)?

A compound is found to contain 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is its empirical formula?

What volume of $CO_2$ is produced at STP when 5.0 g of $CaCO_3$ reacts completely according to the equation $CaCO_3(s) ightarrow CaO(s) + CO_2(g)$?

How many molecules are there in 4.0 moles of $N_2$ gas?

What mass of oxygen is required to completely react with 10.0 grams of methane ($CH_4$) according to the equation $CH_4 + 2O_2 ightarrow CO_2 + 2H_2O$?

A reaction has a theoretical yield of 45.0 grams. If the actual yield is 36.0 grams, what is the percent yield?

What is the mass percentage of hydrogen in water ($H_2O$)?

What information is needed to determine the empirical formula of a compound?

If 10.0 g of hydrogen gas reacts with 70.0 g of oxygen gas, how many grams of water can be produced? The balanced chemical equation is $2H_2 + O_2 \longrightarrow 2H_2O$.

Consider the reaction: $N_2(g) + 3H_2(g) \longrightarrow 2NH_3(g)$. If you start with 56.0 g of $N_2$ and excess $H_2$, what is the theoretical yield of $NH_3$ in grams?

The percent composition of a newly synthesized organic compound was found to be 60.0% carbon, 4.48% hydrogen, and 35.52% oxygen. If the molar mass of the compound is 134 g/mol, what is the molecular formula?

When heated, $CaCO_3$ decomposes into $CaO$ and $CO_2$ according to the equation $CaCO_3(s) \longrightarrow CaO(s) + CO_2(g)$. If 50.0 g of $CaCO_3$ is heated, but only 20.0 g of $CaO$ is recovered, what is the percent yield of the reaction?

In the reaction $2Al(s) + 3Cl_2(g) \longrightarrow 2AlCl_3(s)$, if 54.0 g of $Al$ reacts with 85.0 g of $Cl_2$, determine which reactant is the limiting reactant.