Stoichiometry

Vocab/Equations

100

This states that mass can neither be created nor destroyed

The law of conservation of mass

200

What determines the amount of product that can be formed?

The limiting reactant

300

Coefficients in equations are ____ of moles

ratios

400

What is the equation for percent yield?

(actual yield/theoretical yield)(100)

500

What do you call the measured amount of a product obtained from a reaction?

actual yield

Mole Conversion

100

Mg(s) + 2HCl(aq) → MgCl₂(aq) +H₂(g)

if 2 mol of Mg reacts, how many mol of each product are produced?

2 mol MgCl₂ and 2 mol H₂

200

6CO₂ +6H₂O --> C₂H₁₂O₆ + 6O₂ 

How many moles of carbon dioxide are needed to react with 3.25 mol of water?

3.25 moles

300

How many moles of carbon dioxide are there in a 22g sample of the compound?

0.5 moles

400

N₂+3H₂ -> 2NH₃

Given 2.5 moles of NH₃, how many liters of N₂ would you need?

28 liters of N₂

500

N₂+3H₂ -> 2NH₃

Given 10.1 liters of N₂, how many moles of NH₃ would be created?

0.9 moles NH3

Gram Conversion

100

Convert 25.0 grams of KMnO₄ to moles

0.158 moles

200

Calculate how many moles are in 17.0 grams of H₂O₂

0.5

300

2 NaCl → 2 Na + Cl₂

How many grams of sodium chloride are required to make 0.32 moles of chlorine?

37g NaCl

400

2H₂ + O₂ -> 2H₂O

Given 8g of H₂, how many grams of H₂O are produced?

71.37g H₂O

500

2 Ga₂O₃ → 4 Ga + 3 O₂

How many grams of oxygen can be produced from 15.2 grams of gallium oxide?

3.89 g O₂

Liter Conversion

100

Convert 92.8 liters of N₂ gas at STP to moles

4.14 moles

200

Convert 32 moles of Argon gas to liters at STP

716.8 liters at STP

300

How many moles are in 3.7 L of H₂ gas at STP?

0.17 moles

400

If 55 liters of N₂ reacts with excess H₂, what volume of NH₃ will be produced if the reaction is carried out at STP?

110L NH₃

500

Calculate the volume of hydrogen gas at STP generated by a reaction between 5g of Na and excess water

2.44L H₂

Regents

100

What do the coefficients in a balanced chemical equation indicate about the substances in the equation? 

(1) mass ratios

(2) mole ratios

(3) empirical formulas

(4) molecular formulas

(2) mole ratios

200

C₂O₅OH(l)+3O₂(g)->2CO₂(g)+3H₂O(l)+energy

The mole ratio of oxygen molecules to CO₂ molecules is

3:2

300

Cl₂(g) + 2I^-(aq) -> 2Cl^-(aq) + I₂(s)

What is the number of moles of electrons gained by Cl₂(g) when 2.0 moles of electrons are lost by I^-(aq)?

2.0 moles

400

2KI + F₂ → 2KF + I₂ 

When 2.0 moles of electrons are gained by fluorine, how many moles of electrons are lost by iodine?

2.0 moles

500

4KO₂(s) + 2CO₂(g) → 2K₂CO₃(s) + 3O₂(g) + energy

Determine the number of moles of K₂CO₃ produced when 3.50 moles of KO₂ completely reacts

1.75 moles