Stoichiometry “Stoichiometry” refers to the relative quantities of moles. It also refers to calculations that make use of mole ratios.

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Presentation transcript:

Stoichiometry “Stoichiometry” refers to the relative quantities of moles. It also refers to calculations that make use of mole ratios.

Stoichiometry Consider: 4NH3 + 5O2  6H2O + 4NO How can we read this equation?

Stoichiometry Consider: 4NH3 + 5O2  6H2O + 4NO How can we read this equation? 4 moles of ammonia (NH3) reacts with 5 moles of oxygen gas to form 6 moles of water and 4 moles of nitrogen monoxide.

Stoichiometry Consider: 4NH3 + 5O2  6H2O + 4NO What do the coefficients mean?

Stoichiometry Consider: 4NH3 + 5O2  6H2O + 4NO What do the coefficients mean? Coefficients stand for the number of moles of molecules in the reaction

Stoichiometry Consider: 4NH3 + 5O2  6H2O + 4NO If 4 moles of ammonia (NH3) react, how many moles of water are produce 6

Stoichiometry Consider: 4NH3 + 5O2  6H2O + 4NO What if only 2.3 moles of ammonia (NH3) react. How many moles of water are produced?

Stoichiometry Consider: 4NH3 + 5O2  6H2O + 4NO What if only 2.3 moles of ammonia (NH3) react. How many moles of water are produced? Now you need a conversion factor. We call this a MOLE RATIO.

Stoichiometry Consider: 4NH3 + 5O2  6H2O + 4NO What if only 2.3 moles of ammonia (NH4) react. How many moles of water are produced? Now you need a conversion factor. We call this a MOLE RATIO. 2.3 mol NH3 ( ) = 6 mol H2O 4 mol NH3

Stoichiometry Consider: 4NH3 + 5O2  6H2O + 4NO What if only 2.3 moles of ammonia (NH4) react. How many moles of water are produced? Now you need a conversion factor. We call this a MOLE RATIO. 2.3 mol NH3 ( ) = 3.5 mol H2O 6 mol H2O 4 mol NH3

Consider : 4NH3 + 5O2  6H2O + 4NO How many moles of H2O are produced if 0.176 mol of O2 are used?

Consider : 4NH3 + 5O2  6H2O + 4NO How many moles of H2O are produced if 0.176 mol of O2 are used? 6 mol H2O 5 mol O2 x 0.211 mol H2O = # mol H2O= 0.176 mol O2

Consider : 4NH3 + 5O2  6H2O + 4NO How many moles of NO are produced in the reaction if 17 mol of H2O are also produced?

Consider : 4NH3 + 5O2  6H2O + 4NO How many moles of NO are produced in the reaction if 17 mol of H2O are also produced? 4 mol NO 6 mol H2O x 11.33 mol NO = # mol NO= 17 mol H2O

What if I asked for grams instead of mol?!?! Consider : 4NH3 + 5O2  6H2O + 4NO How many grams of H2O are produced if 1.9 mol of NH3 are combined with excess oxygen?

What if I asked for grams instead of mol?!?! Consider : 4NH3 + 5O2  6H2O + 4NO How many grams of H2O are produced if 1.9 mol of NH3 are combined with excess oxygen? 6 mol H2O 4 mol NH3 x 18.02 g H2O 1 mol H2O x 51.4 g H2O = 1.9 mol NH3

What if I asked for grams instead of mol?!?! Consider : 4NH3 + 5O2  6H2O + 4NO How many grams of O2 are required to produce 0.3 mol of H2O?

What if I asked for grams instead of mol?!?! Consider : 4NH3 + 5O2  6H2O + 4NO How many grams of O2 are required to produce 0.3 mol of H2O? # g O2= 5 mol O2 6 mol H2O x 32 g O2 1 mol O2 x 8 g O2 = 0.3 mol H2O

What if I give grams and ask for grams?!?! Consider : 4NH3 + 5O2  6H2O + 4NO How many grams of NO is produced if 12 g of O2 is combined with excess ammonia?

What if I give grams and ask for grams?!?! Consider : 4NH3 + 5O2  6H2O + 4NO How many grams of NO is produced if 12 g of O2 is combined with excess ammonia? 1 mol O2 32 g O2 x 4 mol NO 5 mol O2 x 30.01 g NO 1 mol NO x 12 g O2 9.0 g NO =

Converting grams to grams Notice that we cannot directly convert from grams of one compound to grams of another. Instead we have to go through moles. Many stoichiometry problems follow a pattern: grams(x)  moles(x)  moles(y)  grams(y) We can start anywhere along this path depending on the question we want to answer Q- for the reaction 2H2 + O2  2H2O what is the path we would take for the following Given 2 moles H2O, calculate grams H2O? Moles O2 required for 36 g H2? Grams of H2O produced from 6 grams O2? Notice that we cannot directly convert from grams of one compound to grams of another. Instead we have to go through moles. Many stoichiometry problems follow a pattern: grams(x)  moles(x)  moles(y)  grams(y) We can start anywhere along this path depending on the question we want to answer Q- for the reaction 2H2 + O2  2H2O what is the path we would take for the following Given 2 moles H2O, calculate grams H2O? Moles O2 required for 36 g H2? Grams of H2O produced from 6 grams O2? Notice that we cannot directly convert from grams of one compound to grams of another. Instead we have to go through moles. Many stoichiometry problems follow a pattern: grams(x)  moles(x)  moles(y)  grams(y) We can start anywhere along this path depending on the question we want to answer Q- for the reaction 2H2 + O2  2H2O what is the path we would take for the following Given 2 moles H2O, calculate grams H2O? Moles O2 required for 36 g H2? Grams of H2O produced from 6 grams O2? Notice that we cannot directly convert from grams of one compound to grams of another. Instead we have to go through moles. Many stoichiometry problems follow a pattern: grams(x)  moles(x)  moles(y)  grams(y) We can start anywhere along this path depending on the question we want to answer Q- for the reaction 2H2 + O2  2H2O what is the path we would take for the following Given 2 moles H2O, calculate grams H2O? Moles O2 required for 36 g H2? Grams of H2O produced from 6 grams O2?

Moving along the stoichiometry path We always use the same type of information to make the jumps between steps: grams (x)  moles (x)  moles (y)  grams (y) Molar mass of x Molar mass of y Mole ratio from balanced equation Given: 4NH3 + 5O2  6H2O + 4NO a) How many moles of H2O can be made using 0.5 mol NH3? b) what mass of NH3 is needed to make 1.5 mol NO? c) how many grams of NO can be made from 120 g of NH3?

Answers 4NH3 + 5O2  6H2O + 4NO a) b) c) 6 mol H2O 4 mol NH3 x = # mol H2O= 0.5 mol NH3 # g NH3= 4 mol NH3 4 mol NO x 17.04 g NH3 1 mol NH3 x 25.6 g NH3 = 1.5 mol NO # g NO= 1 mol NH3 17.04 g NH3 x 4 mol NO 4 mol NH3 x 30.01 g NO 1 mol NO x 120 g NH3 211 g NO =

More Stoichiometry Questions Show all calculations. 1. 2 C4H10 + 13 O2 -> 8 CO2 + 10 H2O a) what mass of O2 will react with 400 g C4H10? b) how many moles of water are formed in a)? 2. 3 HCl + Al(OH)3 -> 3 H2O + AlCl3 How many grams of aluminum hydroxide will react with 5.3 moles of HCl? 3. Ca(ClO3)2 -> CaCl2 + 3 O2 What mass of O2 results from the decomposition of 1.00 kg of calcium chlorate? 4. The reaction of Ca with water can be predicted using the activity series. What mass of water is needed to completely react with 2.35 g of Ca?

5. Fe2O3 + 3CO -> 2Fe + 3CO2. How many moles of carbon monoxide are required to react with 163.0 g of iron(III) oxide? How many grams of CO2 are produced from a reaction that also produces 23.9 grams of Fe? 6. 3Cu + 8HNO3  3Cu(NO3)2 + 4H2O + 2NO how many moles of copper(II) nitrate can be prepared from 17.0 moles of Cu? how many grams of copper(II) nitrate can be prepared using 3.8 moles of HNO3? what mass of water results from the reaction of 8.50 kg of copper metal?