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<center>Two Step Mole Problems Handout 1</center> 
 
Answer the following problems show all work. For the purpose of this handout, all gases are assumed to be at <nowiki>STP</nowiki> (standard temp & pressure). 
 
Answers should be completed on separate sheets (no more than 5 problem per sheet.)

1. What is the mass of 0.015 mole of calcium oxide, Ca1O1?

2. How many molecules in 1.12g of carbon dioxide, C1O2?

3. What is the volume of 0.10 mole of neon gas?

4. What is the number of molecules in 2.5 L of helium gas?

5. What is the mass of 6.67 L of argon gas?

6. How many formula units are in 25g of <nowiki>NaOH</nowiki>

7. What is the mass of 2.3E21 molecules of <nowiki>SiH</nowiki>4?

8. What is the volume of 4.5E24 molecules of hydrogen gas?

9. How many grams are there in 5.45E24 f.u. <nowiki>BaCl</nowiki>2?

10. How many f.u. in 1.00kg of calcium nitrate, Ca1(N1O3)2? 
 
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Two Step Mole Problems Handout 1 
Answer Key

1. 0.84g <nowiki>CaO</nowiki> 
2. 1.53E22 molecules <nowiki>CO</nowiki>2 
3. 2.2L Ne @<nowiki>STP</nowiki> 
4. 6.7E22 molecules He 
5. 11.9g Ar 
6. 3.8E23 f.u. <nowiki>NaOH</nowiki> 
7. 0.12g <nowiki>SiH</nowiki>4 
8. 1.7E2 L H2@STP 
9. 1.88E3g <nowiki>BaCl</nowiki>2 
10. 3.67E24 f.u.

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