Unit 6 Stoich Test Review HC

• 1:2

• 8:4

• 1:4

• 4:8

• 8:11

Tags

NGSS.HS-PS1-7

How many nitrate ions are in lead(IV) nitrate when 2.36 moles of lead(IV) sulfate react in the following equation?

Pb(SO₄)₂ + LiNO₃ → Pb(NO₃)₄ + Li₂SO₄    

• 3.55 x 10²³ ions

• 1.14 x 10²⁴ ions

• 1.14 x 10²⁵ ions

• 2.97 x 10²³ ions

• 5.68 x 10²⁴ ions

Tags

NGSS.HS-PS1-7

An excess of Al and 7.9 mol of Br₂ are reacted according to the equation

2 Al + 3Br₂ → 2AlBr₃

How many moles of AlBr₃ will be formed assuming 100% yield?

• 2.6 mol

• 4.0 mol

• 5.3 mol

• 7.9 mol

• 11.9 mol

Tags

NGSS.HS-PS1-7

Considering the reaction:  C₂H₅OH (l) + 3O₂ (g) → 2CO₂ (g) + 3H₂O (g)

When 12.5 g of ethanol (C₂H₅OH) is reacted with an excess of oxygen, 8.90 g of carbon dioxide is produced.  Determine the PERCENT ERROR of the reaction.

• 34.2%

• 62.8%

• 73.2%

• 37.2%

• 23.9%

Tags

NGSS.HS-PS1-7

Consider that iron metal reacts with oxygen gas in the air to form iron (III) oxide. Suppose we react 3.77 mol iron with 6.00 mol oxygen gas. Determine the amount of excess left over after the reaction is complete.

• 3.17 mol

• 4.23 mol

• 2.83 mol

• 8.00 mol

• 3.00 mol

Tags

NGSS.HS-PS1-7

Consider a synthesis reaction using hypothetical elements (for example an unbalanced reaction of X + Y --> Z). The following statements are true:

i. 4.0 moles of X limits the reaction to produce 10.5 moles of Z

ii. 7.0 moles of Y limits the reaction to produce 2.5 moles of Z

Given the limiting information above, what is the maximum amount of product made from the reaction of 4.0 moles of X and 7.0 moles of Y?

• 13.0 mol Z

• 2.5 mol Z

• 10.5 mol Z

• 11.0 mol Z

• 8.0 mol Z

Tags

NGSS.HS-PS1-7

The balanced equation 2Cu (s) + O₂ (g) → 2 CuO (s) tells us that 4.0 mol of Cu

• reacts with 4.0 mol of O₂

• produces 4.0 mol of CuO

• must react with 128 g of O₂

• cannot react with oxygen

• produces 8.0 mol of CuO

Tags

NGSS.HS-PS1-7

5.18 L of carbon dioxide was prepared at STP using the reaction: C + O₂ → CO₂ Approximately what mass of carbon was required?

• 2.78 g   

• 4.39 g   

• 10.2 g   

• 12.0 g

• 16.3 g

In the reaction represented by the equation

Mg + HCl → H₂ + MgCl₂

What is the maximum mass of magnesium chloride that can be made from 73.2 g of magnesium?

• 10.9 g

• 63.4 g

• 95.2 g

• 153 g

• 287 g

Tags

NGSS.HS-PS1-7

When NH₃ is prepared from 28 g N₂ and excess H₂, the theoretical yield of NH₃ is 34 g. What mass of ammonia (NH₃) is actually produced with a percent yield of 44.12%?

• 28 g

• 15 g

• 12 g

• 78 g

• 34 g

Tags

NGSS.HS-PS1-7