Two Step Mole Problems Handout 1

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Two Step Mole Problems Handout 1

Answer the following problems show all work. For the purpose of this handout, all gases are assumed to be at STP (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 atoms 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 NaOH

7. What is the mass of 2.3E21 molecules of SiH₄?

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

9. How many grams are there in 5.45E24 f.u. BaCl₂?

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 CaO
2. 1.53E22 molecules CO₂
3. 2.2L Ne @STP
4. 6.7E22 atoms He
5. 11.9g Ar
6. 3.8E23 f.u. NaOH
7. 0.12g SiH₄
8. 1.7E2 L H₂@STP
9. 1.88E3g BaCl₂
10. 3.67E24 f.u.