Stoich

Which sample contains exactly 1 mole of atoms?

• 16 g of O2

• 23 g of Na

• 24 g of C

• 36 g of Kr

In the formation of ammonia,

N₂ + 3H₂ → 2NH_3,

_{What is the mole ratio of hydrogen to nitrogen?}

• 3:2

• 1:3

• 3:1

• 2:3

N₂ + 3H₂ → 2NH₃

How many moles of N₂ are required to make 1.0 mol of NH₃

• 1.0

• 2.0

• 0.25

• 0.50

 Fe₂O₃ + 3 CO → 2 Fe + 3 CO₂,

What is the total number of moles of CO used to produce 2 moles of Fe?

• 1

• 2

• 3

• 4

        4 Al + 3 O₂ → 2 Al₂O₃

How many moles of Al₂O₃ will be formed when 27 grams of Al reacts completely with O₂?

• 0.50

• 1.0

• 1.50

• 2.0

 4 Na + O₂ → 2 Na₂O

How many grams of oxygen are completely consumed in the production of 1.00 mole of Na₂O?

• 32.0

• 125

• 62.0

• 16.0

4K_(s) + O_2(g) → 2 K₂O_(s)

If a staff member at a laboratory has 12.0 grams of potassium metal, what is the theoretical yield of potassium oxide that the scientist could potentially produce from the reaction with oxygen gas?

• 9.96 g

• 14.5 g

• 28.9 g

• 57.8 g

3CaCl_2(aq) + 2Na₃(PO₄)_(aq) →  Ca₃(PO₄)_2(s)  + 6NaCl_(aq) 

Suppose 163.9 g of Na₃(PO₄) in solution mixed with sufficient CaCl₂ in solution yields 116 g of Ca₃(PO₄)_2(s) .

 

What is the percent yield of Ca₃(PO₄)_2(s)?

• 111%

• 75%

• 71%

• 50%

Which of the following is true of a limiting reagent?

I.   It is a reactant

II.  It limits the amount of product formed

III. It determines the maximum amount of product formed.

• I

• II

• I & II

• I, II, & III

SnO₂ + 2H₂ → Sn + 2H₂O

 

Tin (IV) oxide (SnO₂) reacts with excess hydrogen to produce tin and water.

What is the limiting reactant?

• SnO₂

• H₂

• Sn

• H₂O