Stoichiometry

What is the Correct Mole Ratio of Oxygen to Water?

C3H8 + O2 --> CO2 + H20

• 1:3

• 1:4

• 5:3

• 5:4

N2 +  H2 → NH3

  How many moles of hydrogen are needed to react with 2 moles of nitrogen?

• 6 mol H

• 2 mol H

• 3 mol H

• 1 mol H

In a lab, a scientist calculate he should produce 12.3 grams of product in his experiment. When he is finished collecting his product it weighs 10.1 grams. What is his percent yield?

• 82%

• 0.82%

• 10.51%

• 98.7%

2H2   +   O2  →  2H2O

How many moles of water can be produced if 8 moles H₂ are used?

• 4 moles

• 8 moles

• 16 moles

• 2 moles

4Al + 3O2 –> 2Al2O3

  How much aluminum would be needed to completely react with 45 grams of O2?

• 1.05 moles

• 3.75 moles

• 1.875 grams

• 1.875 moles

B2H6 + 3O2 -->2HBO2 + 2H2O

 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

For the reaction represented by the equation Cl2 + 2KBr → Br2 + 2KCl, how many grams of potassium chloride can be produced from 356 grams potassium bromide?

• 749 g

• 225 g

• 479 g

• 814 g

Identify the limiting reagent when 6.00 g HCl combines with 5.00 g Mg to form MgCl2_.   Mg +  2HCl --> MgCl2  +  H2     

• Mg

• H2

• MgCl2

• HCl

 SiO2 +C3 --> SiC + 2CO I need to add 8 moles of Carbon to the reaction. How many grams of Carbon should I weigh?

• 96 g

• 0.67 g

• 2.67 g

• 48 g

48.86 g of cobalt is equal to how many moles of cobalt?

• 2879 moles

• 8.291 moles

• 0.8291 moles

• 0.0829 moles