Molecules to Mass

Multiple Choice

What is the molar mass of H₂O?

• 290g

• 18g

• 12g

• 1g

Multiple Choice

What is the unit that expresses mass?

• liters, L

• grams, g

• meters, m

• ounces, oz

Multiple Choice

Which is used to find the mole ratio?

• the coefficients

• the subscripts

• the symbols

Multiple Choice

How many moles of oxygen will be produced when 25g of KClO₃ is decomposed?

2KClO₃ ----> 2KCl + 3O₂

• .78 mol O₂

• .60 mol O₂

• .30 mol O₂

• 1.8 mol O₂

Multiple Choice

How many moles of O₂ are produced when 68g of Al₂O₃ decomposes?

2Al₂O₃ --------> 4Al + 3O₂

• 1.0 mol O₂

• 2.0 mol O₂

• 56 mol O₂

• 13 mol O₂

Multiple Choice

Using the balanced chemical equation:

Mg + 2 HCl --> MgCl₂ + H₂

How many grams of MgCl₂ is produced if 4.67 moles of HCl react?

• 219 g MgCl₂

• 4.67 g MgCl₂

• 94 g MgCl₂

Multiple Choice

Using the balanced chemical equation:

4NH₃ + 3O₂ --> 2N₂ + 6H₂O

Determine the amount of grams of N₂ is produced if 4.03 moles of NH₃ react?

• 28.0 g N₂

• 56.4 g N₂

• 2.02 g N₂

Multiple Choice

Calculate the molar mass of propane (C₃H₈).

• 13 g/mol

• 44 g/mol

• 99 g/mol

Multiple Choice

65 grams of glucose (C₆H₁₂O₆) react in a combustion reaction. How many grams of water (H₂O) are produced?

C₆H₁₂O₆ + 6 O₂ → 6 CO₂ + 6H₂O

• 14g H₂O

• 20g H₂O

• 39g H₂O

• 12g H₂O

Multiple Choice

CH₄ + 2O₂ --> 2H₂O + CO₂
What is the mass of CO₂ produced when 35g of O₂ reacts? 

• 1.09 g

• 24.1 g

• 28.2 g

• 44.0 g

Multiple Choice

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

Multiple Choice

From the reaction: B₂H₆ + 3O₂ -->2 HBO₂ + 2 H₂O

What mass of O₂ will be needed to burn 36.1 g of B₂H₆?

B₂H₆ = 27.68 g/mol

• 13.8 g O₂

• 3.91 mol of O₂

• 125 g O₂

• 41.7 g O₂