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# Moles

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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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