Question 1

A student adds 2.4 g of magnesium (atomic mass = 24) to 100 mL of 1 M HCl. Calculate the number of moles of HCl present in the solution before the reaction starts.

Accepted Answer

$$0.1$$ mol

Question 2

In the reaction $$\mathrm{Mg} + 2\mathrm{HCl} \rightarrow \mathrm{MgCl}_2 + \mathrm{H}_2$$, what is the limiting reagent when 2.4 g of Mg is added to 100 mL of 1 M HCl?

Accepted Answer

Hydrochloric acid

Question 3

If 2.4 g of Mg reacts with 100 mL of 1 M HCl, how many liters of hydrogen gas ($$\mathrm{H}_2) $$are produced at STP?

Accepted Answer

$$0.56 L$$

Question 4

After the reaction between 2.4 g Mg and 100 mL of 1 M HCl is complete, how many moles of magnesium remain unreacted?

Accepted Answer

$$0.01$$ mol

Question 5

Given 800 g of solution contains 320 g of solute X, what is the mass of solvent in the solution?

Accepted Answer

$$480 g$$

Question 6

If after cooling, 100 g of solute X is removed from the solution, how much solute X remains?

Accepted Answer

$$220 g$$

Question 7

What is the total weight of the solution after cooling, given that the solvent is $$480 g $$and the remaining solute X is $$220 g$$?

Accepted Answer

$$700 g$$

Question 8

In the reaction $$3\mathrm{Cu} + 8\mathrm{HNO}_3 \rightarrow 3\mathrm{Cu(NO}_3)_2 + 2\mathrm{NO} + 4\mathrm{H}_2\mathrm{O}$$, if the molecular weight of $$\mathrm{HNO}_3 is$$ $$M$$, what is its equivalent weight?

Accepted Answer

$$\frac{4}{3}M$$

Question 9

A chemist wants to prepare a solution with a solute to solvent mass ratio of $$\frac{2}{3}. If $$the solvent mass is $$480 g$$, what should be the mass of solute X?

Accepted Answer

Question 10

If $$0.1$$ mol of HCl is available and reacts with excess Mg, how many moles of $$\mathrm{H}_2$$ gas will be produced?

Accepted Answer

$$0.05$$ mol

Question 11

Which of the following statements is INCORRECT regarding the reaction of 2.4 g Mg with 100 mL of 1 M HCl?

Accepted Answer

1.12 L of hydrogen is produced at STP

Question 12

In the reaction $$3\mathrm{Cu} + 8\mathrm{HNO}_3 \rightarrow 3\mathrm{Cu(NO}_3)_2 + 2\mathrm{NO} + 4\mathrm{H}_2\mathrm{O}$$, how many moles of $$\mathrm{HNO}_3$$ are required to react completely with $$3$$ moles of Cu?

Accepted Answer

$$8$$ moles

Question 13

A solution contains $$320 g of $$solute X in $$800 g of $$solution. What is the mass percent of X in the solution?

Accepted Answer

$$40\%$$

Question 14

If $$0.01$$ mol of Mg is left unreacted after the reaction with HCl, what is the mass of Mg remaining?

Accepted Answer

$$0.24 g$$

Question 15

Which of the following best explains why HCl is the limiting reagent in the reaction between 2.4 g Mg and 100 mL of 1 M HCl?

Accepted Answer

There are fewer moles of HCl than required to react with all the Mg

Question 16

If the molecular weight of $$\mathrm{HNO}_3 is$$ $$M$$, what is the formula for its equivalent weight in the reaction $$3\mathrm{Cu} + 8\mathrm{HNO}_3 \rightarrow 3\mathrm{Cu(NO}_3)_2 + 2\mathrm{NO} + 4\mathrm{H}_2\mathrm{O}$$?

Accepted Answer

$$\frac{4}{3}M$$

Question 17

A solution initially contains $$320 g of $$solute X and $$480 g of $$solvent. After cooling, $$100 g of X $$precipitates out. What is the new concentration of X in the solution (in g per 700 g solution)?

Accepted Answer

$$220 g$$ / $$700 g$

Question 18

In a chemical reaction, the equivalent weight of an acid is defined as:

Accepted Answer

The mass of acid that supplies or reacts with one mole of hydrogen ions

Question 19

If $$3$$ moles of Cu react with $$8$$ moles of $$\mathrm{HNO}_3$$, how many moles of $$\mathrm{NO}$$ are produced?

Accepted Answer

$$2$$ moles

Question 20

A solution contains $$320 g of $$solute X in $$800 g of $$solution. If $$100 g of X is $$removed, what is the percentage decrease in the mass of X?

Accepted Answer

$$31.25\%$$

Fundamental Concepts in Chemistry: Stoichiometry and Solution Calculations

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