Mixed Stoichiometry Quiz

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

• 6.7 mol
• 1.0 mol
• 10.1 mol
• 4.5 mol

2 NaClO₃ (s) --> 2NaCl (s) +3 O₂ (g)  
12.00 moles of NaClO₃ will produce how many grams of O₂?

• 256 g of O₂
• 576 g of O₂
• 288 g O₂

B₂H₆ + 3O₂ -->2 HBO₂ + 2 H₂O
 What mass of O₂ will be needed to burn 36.1 g of B₂H₆?

• 13.8 g O₂
• 3.86 mol of O₂
• 124 g O₂

What is the first thing you must do to solve a stoichiometry problem?

• Write a Balanced Equation
• Panic
• Write an Unbalanced Equation
• Ask for help

How many liters of NH₃ are needed to react completely with 30.0L of NO?
4NH₃+6NO --> 5N₂ + 6H₂O

• 5.0 L
• 20.0 L
• 7.5 L
• 120.0 L

A mole of any substance is how many particles?

• 6.02 x 10²³

• 6.02 x 10^-23

• 602 million

• 602

The calculation of the relationships between different molecules in a reaction is the definition of __________________.

• physics

• algebra

• stoichiometry

• language arts

Calculate the molar mass of Mg(OH)_2.

• 33.2 g/mol

• 41.3 g/mol

• 86.9 g/mol

• 58.3 g/mol

2Al + 6HCl --> 2AlCl₃ + 3H₂

Aluminium reacts with hydrochloric acid. How many grams of aluminum are necessary to produce 11 L of hydrogen gas at STP?

• 13

• 8.8

• 0.99

• 1.0

Where are the numbers for a mole ratio found?

• They are part of the chemical formulas for the reactants / products.

• They are given in the problem.

• They are found on the periodic table for those elements.

• They are found as coefficients in the reaction's balanced chemical equation.