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Counting Atoms
Molar Mass
Mole to Gram
100
What is the total number of atoms in this formula?

Al2O3

5 atoms

100

In molar mass, the mass of the elements must be ________ before multiplying.

Rounded

100

If a question asks you to find grams, what needs to be done?

Multiply by the molar mass

200
How many P atoms is there in the following formula?

Li3PO4

1 atom

200

What is the mass of Chlorine rounded? (Check your periodic table)

35

200

If a questions asks you to find mole, what needs to be done?

Divide by the molar mass

300

This small number is found next to atoms and tells us how many of that atom there is.

Subscript

300

What is the molar mass of CO2?

44 g/mol

300

How many grams are in 3.5 moles of H2O?

63g of H2O

400

When there is a number outside of a parenthesis, what needs to be done?


Multiply with everything on the inside of the parenthesis

400

What is the molar mass of H2SO4?

98 g/mol

400

How many moles are in 440 grams of Fe2O3?

2.75 mol of Fe2O3

500

How many atoms is there in the following formula?

Al2(SO4)3

17

500

What is the molar mass for Mg3(PO4)2?

262 g/mol

500

How many moles are in 94.2 grams of Cu(CN)2?

0.81 mol of Cu(CN)2