Moles & Stoichiometry

Which of the following is an empirical formula?

• C₆H₁₂O₆

• C₂H₄O₆

• CH₂O

• C₂H₂O₂

How many molecules are in 3.6 grams of sodium chloride (NaCl)?

• 0.06

• 1.0 X 10²¹

• 1.3 x 10²⁶

• 3.7 x 10²²

What is the molar mass of C₂H₄O₂?

• 40 g/mol

• 50 g/mol

• 60 g/mol

• 68 g/mol

The number 6.02 x 10²³ is called...

• Obama's number and it measures the amount of gases or liters in a mole

• Bohr's number and it measures the amount of molecules or atoms in a sample

• Avogadro's number and it measures the amount of gas in moles

• Avogadro's number and it measures the amount of molecules or atoms in a sample

How many moles would be in 8.40 grams of octane, C₈H₁₈?

• 0.0735 moles

• 5.04 x 10²⁴ moles

• 959 moles

• 0.645 moles

_N₂ + _H₂ → _NH₃

What is the mole ratio between N₂ and NH₃ if you balanced the above equation correctly?

• 1 moles NH₃ / 2 moles N₂

• 2 moles NH₃ / 1 moles N₂

• 2 moles N₂ / 3 moles NH₃

• 1 moles N₂ / 3 moles NH₃

2Na + 2H₂O → 2NaOH+ _H₂

How many grams of hydrogen are produced if 120 g of Na are available?

• 5.2 g

• 2.6 g

• 690 g

• 45 g

N₂ +  3H₂ → 2NH₃ 
How many moles of hydrogen are needed to react with 2 moles of nitrogen?

• 6
• 2
• 3
• 1

Balance the following reaction :
 
CaC₂(s)   +   H₂O(l)   -->   C₂H₂(g)   +   Ca(OH)₂(aq)

• 1,2,2,2
• 1,2,1,1
• 2,1,1,1
• 2,1,2,1

Two Reactants and One Product

• Decomposition
• Synthesis
• Combustion
• Single Replacement