Stoichemistry Part 1

How many particles are in a mole?

• a. 602

• b. 602 million

  ³

• c. 602 moles

• d. 6.02 x 10²³

What is the mole ratio in the following reaction: 2CO  +  O₂  → 2CO₂

• a. 2:1:2

• b. 1:1:1

• c. 1:2:1

• d. 2:1:1

KNO₃ --> KNO₂ + O₂ What coefficients are needed to balance the reaction?

• a. 2, 2, 1

• b. 2, 3, 2

• c. 1, 2, 2

• d. 1, 3, 1

O₂ + CS₂ --> CO₂ + SO₂ What coefficient would go in front of the O₂?

• a. 1

• b. 3

• c. 2

• d. 4

WO₃ + H₂ --> W + H₂O What coefficient goes in front of H₂?

• a. 1

• b. 2

• c. 3

• d. 4

2 KClO₃ → 2 KCl + 3 O₂ How many moles of oxygen are produced when 6.7 moles of KClO₃ decompose completely?

• a. 6.7 mol

• b. 1.0 mol

• 10.1 mol

• 4.5 mol

. 2Na + 2H₂O → 2NaOH+ H₂ How many grams of hydrogen are produced if 120 g of Na are available?

• a. 5.2 g

• b. 2.6 g

• c. 690 g

• d. 45 g

 2Al + 3H₂SO₄ -> Al₂(SO₄)₃ + 3H₂ How many grams of aluminum sulfate would be formed if 250g H₂SO₄ completely reacted with aluminum?

• a. 0.85 g

• b. 290 g

• c. 450 g

• d. 870 g

 1 mole of any gas at STP has a volume of ______________________. 

• a. 22.4 liters

• b. 44.2 liters

• c. 6.02 x 10²³ liters

• d. 2.4 liters

Using the following equation: Fe₂O₃(s) + 3H₂(g) → 2Fe(s) + 3H₂O(l) How many moles of iron (Fe) can be made from  6 moles H₂? 

• 4 moles Fe

• 6 moles Fe

• 9 moles Fe

• 2 moles Fe