*** no longer use *** Reaction Math Practice

What is the mole ratio of H₂O to H₃PO₄ in the following chemical equation?  

P₄O₁₀ + H₂O -->H₃PO₄ 

Don't forget to balance the equation!

• 6:4
• 4:6
• 1:3
• 3:1

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

• 0.85 g
• 290 g
• 450 g
• 870 g

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

Don't forget to balance the reaction!

• 4 moles Fe
• 6 moles Fe
• 9 moles Fe
• 2 moles Fe

18.26 mL of a 1.50 M hydrochloric acid reacts with magnesium hydroxide. Calculate the mass of magnesium hydroxide needed for the reaction.

Mg(OH)₂ + 2 HCl -> 2 H₂O + MgCl₂

• 0.499 g Mg(OH)₂

• 0.799 g Mg(OH)₂

• 0.0274 Mg(OH)₂

• 0.0137 g Mg(OH)₂

When 12 moles of O₂ reacts with 1.1 mole of C₁₀H₈ what is the limiting reactant?  C₁₀H₈ + 12 O₂ --> 10 CO₂ + 4 H₂O

• Oxygen
• C₁₀H₈
• Water
• Carbon Dioxide

What is the percent yield of the following reaction if 145g of P₂O₅ reacts with 40 grams of water, but you only collected 112 grams of phosphoric acid  

3 H₂O + P₂O₅ -> 2H₃PO₄

• 80%
• 85%
• 77%
• 58%

Nitric acid can be neutralized by any base to form a salt and water, as in the following equation:

Mg(OH)₂ + 2 HNO₃ → Mg(NO₃)₂ + 2 H_­2O

How much of the excess reactant remains when the reaction of 250. g magnesium hydroxide with 250. g nitric acid is complete?

• 44 g

• 384 g

• 116 g

• 134 g

CH₄ + 2H₂O --> CO₂ + 4H₂

What is the limiting reactant when 20. g CH₄ react with 15 g H₂O?

• CH₄

• H₂O

• CO₂

• H₂

20.0 mL of an unknown molarity of HCl is reacted with excess copper (II) oxide. A 2.44 gram sample of CuCl₂ is precipitated out. What is the molarity of the HCl?

2 HCl + CuO → CuCl₂ + H₂O

• 0.122 M

• 1.81 M

• 65.7 M

• 2.55 M

What mass of CO₂ will be produced when 50 g of CaCO₃ decomposes?

CaCO₃ → CO₂ + CaO

• 22 g

• 44 g

• 11 g

• 33 g