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# Moles (Grades 11-12)

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## Moles

1.
Avogadro's number is equal to                              molecules in a mole.
1. $3.00 xx 10^8$
2. $1.602 xx 10^-23$
3. $6.022 xx 10^23$
4. $6.22 xx 10^23$

2.
What is the mole ratio of $CO_2 to C_6 H_12 O_6$ in the combustion reaction:$C_6 H_12 O_6 + 6O_2 -> 6CO_2 + 6H_2O$?
1. 1:1
2. 1:2
3. 1:6
4. 6:1
3.
The volume of one mole of an ideal gas under conditions of standard temperature and pressure is                .
1. 0.0224 liters.
2. 2.24 liters
3. 22.4 liters
4. 44.8 liters.

4.
Given the reaction $CH_4 + 2O_2 rarr CO_2 + 2H_2 O$ ,
What amount of oxygen is needed to completely react with 1 mole of $CH_4$?
1. 2 moles
2. 2 atoms
3. 2 grams
4. 2 molecules
5.
How many moles are found in 20 grams of $Al_2O_3$?
1. .2
2. 2
3. 20
4. .02

6.
How many moles are there in 15 grams of lithium?
7.
What is the mass of 12.4 moles of chromium?

8.
What is the mass of 2.4 moles of sulfur?
9.
What would be the mass of 2.5 moles of carbon dioxide?

10.
How many moles are in 68 grams of copper(II) hydroxide, $Cu(OH)_2$?
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