Stoichiometry

Front

In the equation 2 Al₂O₃ --> 4 Al + 3 O₂, what is the mole ratio of aluminum to oxygen (aluminum is asked for, oxygen is given)?

Back

4/3

Front

Mole ratio of oxygen to water in the reaction 2 H₂ + O₂ → 2 H₂O

Back

1/2

Front

What is the molar mass of table salt (NaCl)?

Back

58.44 g/mol

Front

What is the molar mass of NaOH?

Back

40.00 g/mol

Front

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

Back

6

Front

2H₂ + O₂ → 2H₂O
How many moles of water can be produced if 8 moles H₂ are used?

Back

8 moles

Front

2NaClO₃ (s) → 2NaCl (s) + 3O₂ (g) 12.00 moles of NaClO₃ will produce how many grams of O₂? NaClO₃ = 106.44 g/mol ; O₂ = 32.00 g/mol

Back

576 g of O₂

Front

Cl₂ + 2KBr → Br₂ + 2KCl How many grams of potassium chloride (KCl) can be produced from 356 g of potassium bromide (KBr)? KCl = 74.55 g/mol ; KBr = 119.00 g/mol

Back

223 g

Front

What mass of O₂ is needed to burn 36.1 g of B₂H₆ in the reaction: B₂H₆ + 3O₂ --> 2 HBO₂ + 2 H₂O? B₂H₆ = 27.68 g/mol

Back

125 g O₂

Front

18.26 mL of a 1.50 mol/L hydrochloric acid reacts with magnesium hydroxide. Calculate the mass of magnesium hydroxide needed for the reaction. \( \text{Mg(OH)}_2 + 2 \text{HCl} \rightarrow 2 \text{H}_2\text{O} + \text{MgCl}_2 \) \( \text{Mg(OH)}_2 = 58.33 \text{ g/mol} \) ; \( \text{HCl} = 36.46 \text{ g/mol} \)

Back

0.799 g Mg(OH)\(_2\)