Gas Stoichiometry

Assume that 5.6 L H2 at STP reacts with excess CuO according to the following equation:

CuO (s) + H₂ (g) ---> Cu (aq) + H₂O (l)

How many moles of Cu are produced?

• 0.250 mol

• 2.50 mol

• 25.0 mol

• 25.00000 mol

Tags

NGSS.HS-PS1-7

You have 3.5 L of H₂ (g) at STP. How many moles of gas are there?

• 22.4 mol
• 22.4 L
• 0.16 mol
• 0.16 L

How many liters of NH₃ are needed to react completely with 30.0L of NO?

4NH₃(g) + 6NO (l)--> 5N₂ (g) + 6H₂O (l)

• 5.0 L

• 20.0 L

• 7.5 L

• 120.0 L

Tags

NGSS.HS-PS1-7

Which mole ratio is correct for the given chemical equation?

2N₂ (g) + 5O₂ (g) -----> 2N₂O₅ (g)

• 2 mol N₂ to 5 mol N₂O₅

• 2 mol N₂ to 2 mol N₂O₅

• 5 mol O₂ to 2 mol NO₂

• None are correct.

Tags

NGSS.HS-PS1-7

Theoretical yield = 73g
Actual yield = 62g
Calculate the percent yield.

• 1.16%
• 116%
• 85%
• 76%

Tags

NGSS.HS-PS1-7

2CO (g) + O_{2 (g)} --> 2CO₂ (g)

How many liters of carbon dioxide (CO₂) are produced from 10L of carbon monoxide (CO)?

• 10

• 20

• 1

• 5

Tags

NGSS.HS-PS1-7

What volume of hydrogen(H₂) will be produced at STP by the reaction 67.3 g of magnesium with excess water according to the following reaction?

1Mg (s) + 2H₂O (l) --> Mg(OH)₂ (aq) + H₂ (g)

• 62L

• 65L

• 31L

• 124L

Tags

NGSS.HS-PS1-7

What is the limiting reagent in the picture?

• HCl

• H2

• Cl2

Tags

NGSS.HS-PS1-7

The limiting reactant is the ....

• the one that is leftover when the reaction is complete

• the one that is completely consumed ( no leftovers) in the reaction

• the product

Solid aluminum react with HCl according to the following balanced equation at STP:

2Al (s) + 6HCl (aq) --> 2AlCl₃ (aq) + 3H₂ (g)

If 13.5 g of Al (s) reacts with excess HCl, how many liters of H₂ gas are generated?

• 15.2 L

• 16.8 L

• 12.5 L

• 14.8 L

Tags

NGSS.HS-PS1-7