Wed 5/12 HChem

If 10 grams of iron chloride and 10 grams of potassium hydroxide react, how many moles of iron hydroxide are produced?

FeCl₂ + 2 KOH --> Fe(OH)₂ + 2 KCl

• 0.078 moles Fe(OH)₂

• 0.089 moles Fe(OH)₂

• 0.17 moles Fe(OH)₂

• 0.05 moles Fe(OH)₂

If 0.4 moles of lithium reacts with 0.3 moles copper nitrate, which reactant is the limiting reagent and how much of the excess reagent is left over?

2 Li + Cu(NO₃)₂ --> Cu + 2 LiNO₃

• LR=Li, 0.2 moles Cu(NO₃)₂

• LR=Cu(NO₃)₂, 0.2 moles Li

• LR=Li, 0.1 moles Cu(NO₃)₂

• LR=Cu(NO₃)₂, 0.1 moles Li

If 6.7 x 10^-5 moles of silver nitrate reacts with 4.5 x 10^-5 moles of calcium chloride, how many moles of silver chloride will be produced?

2 AgNO₃ + CaCl₂ --> 2 AgCl + Ca(NO₃)₂

• 9 x 10^-5 moles AgCl

• 6.7 x10^-5 moles AgCl

• 4.5 x10^-5 moles AgCl

• 2.1 x 10^-4 moles AgCl

3.4 grams of pentane reacts with 5.0 grams oxygen, which reactant is limiting and how much of the excess reactant is left over?

C₅H₁₂ + 8 O₂ --> 5 CO2 + 6 H₂O

• Pentane is limiting and 0.0195 moles of oxygen left over

• Pentane is limiting and 0.0275 moles of oxygen left over

• Oxygen is limiting and 0.0195 moles of pentane left over

• Oxygen is limiting and 0.0275 moles pentane left over

350 mL of water vapor is produced at STP, what mass of hydrocarbon reacted?

C₂H₄ + 3 O₂ --> 2 CO₂ + 2 H₂O

• 22 grams of C₂H₄

• 0.22 grams of C₂H₄

• 2.2 grams C₂H_4

• 0.0078 grams of C₂H₄