Stoichiometry

The quantitative relationship between the products and reactants in a chemical equation.

Compare reactants to products, products to

products, or reactants to reactants using

conversions.

In other words

Mole Ratio

(from balanced equation)

ExampleWrite the balanced chemical reaction of a

solution of potassium iodide and a solution of lead (II) nitrate.

___KI + ___Pb(NO3)2 ___PbI2 + ___KNO32 2

How many moles of PbI2 will be produced from 4.6 moles of KI?

_2_KI + ___Pb(NO3)2 ___PbI2 + _2_KNO3

Moles to Moles

4.6𝑚𝑜𝑙 𝐾𝐼1𝑚𝑜𝑙𝑃𝑏𝐼 22𝑚𝑜𝑙 𝐾𝐼

=2.3𝑚𝑜𝑙 𝑃𝑏𝐼 2

How many grams of PbI2 will be produced from 3.2 moles of Pb(NO3)2?

_2_KI + ___Pb(NO3)2 ___PbI2 + _2_KNO3

What about grams?

3.2𝑚𝑜𝑙Pb (NO3)2 𝑥1𝑚𝑜𝑙𝑃𝑏𝐼 2

1𝑚𝑜𝑙 Pb (NO 3)2𝑥460.99𝑔𝑃𝑏𝐼 21𝑚𝑜𝑙 𝑃𝑏𝐼 2

=1500𝑔𝑃𝑏𝐼 2

Sodium reacts with chlorine gas to produce sodium chloride.

A. Write a balanced equation.B. How many moles of chlorine gas are needed if 4.0 moles of sodium react?C. How many grams chlorine gas are needed to produce 2.0 moles of NaCl?

You try

Sodium reacts with chlorine gas to produce sodium chloride.

A. Write a balanced equation.

2Na (s) + Cl2 (g) 2NaCl (s)

You try

Sodium reacts with chlorine gas to produce sodium chloride.2Na (s) + Cl2 (g) 2NaCl (s)

B. How many moles of chlorine gas are needed if 4.0 moles of sodium react?

You try

Sodium reacts with chlorine gas to produce sodium chloride.2Na (s) + Cl2 (g) 2NaCl (s)

C. How many grams of chlorine gas are needed to produce 2.0 moles of the NaCl?

You try

Lead (II) nitrate and sodium iodide react to form sodium nitrate and lead (II) iodide.

A. Write a balanced equation.B. How many moles of sodium iodide react with 250.0 grams of lead (II) nitrate?C. If 140.9 grams of lead (II) iodide are produced, how many grams of sodium iodide were used?

You try

Solid magnesium oxide reacts with water to produce magnesium hydroxide.

A. Write a balanced equation for the reaction.B. How many grams of MgO are needed to produce 264.7 grams of Mg(OH)2?

C. How many grams of magnesium hydroxide are produced when 57.0 grams of water are used?

You try

StoichiometryHomework:Yellow Packet – Stoich WS 1

Lab:Final copy due Beginning of your class on FRIDAYDue to turnitin.com by Friday at 7 pm