Download Stoichiometric Conversions

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Predict the products and write a balanced
equation for the following:
BaCl2 + MgSO4 
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Greek for “measuring elements”
The calculations of quantities in chemical
reactions based on a balanced equation.
We can interpret balanced chemical equations
several ways.
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Two molecules of hydrogen and one
molecule of oxygen form two molecules of
water.
2 dozen molecules of hydrogen and one
dozen molecules of oxygen form two
dozen molecules of water.
Two moles of hydrogen and one mole of
oxygen form two moles of water
This does not work with mass!!!!
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2 Al2O3 Al + 3O2
every time we use 2 moles of Al2O3 we
make 3 moles of O2
2 moles Al2O3
3 mole O2
or
3 mole O2
2 moles Al2O3
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This is called a mole ratio
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How many moles of O2 are produced when
3.34 moles of Al2O3 decompose?
2 Al2O3 Al + 3O2
3.34 mol 3 mol O2 = 5.01 moles O
2
Al2O3
2 mol Al2O3
2C2H2 + 5 O2  4CO2 + 2 H2O
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If 3.84 moles of C2H2 are burned, how many
moles of O2 are needed?
How many moles of C2H2 are needed to
produce 8.95 mole of H2O?
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If 3.6 mol of Fe are added to a solution of
Copper (II) Sulfate, how many grams solid
copper would form?
2Fe + 3CuSO4  Fe2(SO4)3 + 3Cu
3.6 mol Fe 3 mol Cu
2mol Fe
= 2.4 mol Cu
5.4 mol Fe 63.55g Cu = 343.17g Cu
1mol Fe
To make silicon for computer chips they use this
reaction
SiCl4 + 2Mg  2MgCl2 + Si
 How many grams of Mg are needed to make
9.3mol of Si?
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How many grams of SiCl4 are needed to make
9.3mol of Si?
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When methane gas is heated with oxygen
gas, the two will combust and form carbon
dioxide and water
CH4 + 2O2  CO2 + 2H2O
How many moles of H2O will be formed when
28.0 g of methane combusts?
28.0g CH4
1 mol CH4
= 1.74 mol CH4
16.05 g CH4
1.74 mol CH4
2 mol H2O
= 3.48 mol H2O
1 mol CH4
The first step in the industrial manufacture of nitric
acid is the catalytic oxidation of ammonia.
4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g)
How many moles of NO can be formed from 825g
NH3?
How many moles of H2O are formed from 825 g
NH3?
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Use the following equation to answer the questions:
4NH3 + 3O2  2N2 + 6H2O
1. How many moles of N2 are formed from 4 moles of
NH3?
2. How many moles of H2O will be produced when 5
moles of N2 are formed?
3. How many moles of O2 are required to react with
25g of NH3?
4. How many moles of N2 can be formed is 100g of O2
is mixed with NH3?
5. How many grams of H2O are produced if 3.7mol of
O2 is mixed with NH3?
6. How many grams of NH3 are required to produce
5mol of O2?