Mass Stoichiometry

Mole-Mass Stoichiometry

By Jacob Besh

Bellringer

Some text here about the topic of discussion

Molar Mass

• Mass, in grams, of one mole of a substance.

• Most of the time in chemistry, the amounts are given in gram instead of moles.

• We still go through moles and use the mole ratio, but now we also use molar mass to get to grams.

Examples

Mass-Mole

• We can also start with mass and convert to moles of a product or another reactant.

• We use ​molar mass and the mole ratio to get to moles of the compound of interest.

Example

Multiple Choice

How many moles of $$HgO$$  are needed to produce 125 g of $$O_2$$  ?

$$2\ HgO\longrightarrow2\ Hg+O_2$$  

• 7.81 mol HgO

• 4.32 mol HgO

• 9,000 mol HgO

• 3.89 mol HgO

Multiple Choice

How many moles of Hg are produced?

• 2.42 mol Hg

• 24.26 mol Hg

• 7.81 mol Hg

• 56.24 mol Hg