Question 6.15: Calculating the Number of Moles of Solute in a Solution Hydr......

General Chemistry: Atoms First [1015060]

Calculating the Number of Moles of Solute in a Solution
Hydrochloric acid is sold commercially as a 12.0 M aqueous solution. How many moles of HCl are in 300.0 mL of 12.0 M solution?
STRATEGY
The number of moles of solute is calculated by multiplying the molarity of the solution by its volume in liters.

Step-by-Step

The 'Blue Check Mark' means that this solution was answered by an expert.
Learn more on how do we answer questions.

$\text{Moles of HCL} = (\text{Molarity of solution}) \times (\text{Volume of solution}) \\ = \frac{12.0 \ mol \ HCL}{1 \ \cancel{L}} \times 0.3000 \ \cancel{L} = 3.60 \ mol \ HCL$
There are 3.60 mol of HCl in 300.0 mL of 12.0 M solution.
BALLPARK CHECK
One liter of 12.0 M HCl solution contains 12 mol of HCl, so 300 mL (0.3 L) of solution contains $0.3 \times 12 = 3.6 \ mol$ .

Related Answered Questions

Question: 6.5

Converting Mass to Moles How many moles of sucrose are in a tablespoon of sugar containing 2.85 g? (The molar mass of sucrose, C12H22O11, was calculated in Worked Example 6.4 to be 342.0 g/mol) STRATEGY The problem gives the mass of sucrose and asks for a mass-to-mole conversion. Use the molar ...

Verified Answer:

\begin{aligned}2.85 \ \cancel{ g \ sucrose ...

Question: 6.2

Balancing a Chemical Equation The major ingredient in ordinary safety matches is potassium chlorate, KClO3, a substance that can act as a source of oxygen in combustion reactions. Its reaction with ordinary table sugar (sucrose, C12H22O11), for instance, occurs violently to yield potassium ...

Verified Answer:

Step 1 Write the unbalanced equation, making sure ...

Question: 6.1

Balancing a Chemical Equation Propane, C3H8, is a colorless, odorless gas often used as a heating and cooking fuel in campers and rural homes. Write a balanced equation for the combustion reaction of propane with oxygen to yield carbon dioxide and water. ...

Verified Answer:

Follow the four steps described in the text: Step ...

Question: 6.13

Calculating an Empirical Formula from a Combustion Analysis Caproic acid, the substance responsible for the aroma of goats, dirty socks, and old shoes, contains carbon, hydrogen, and oxygen. On combustion analysis, a 0.450 g sample of caproic acid gives 0.418 g of H2O and 1.023 g of CO2. What is ...

Verified Answer:

First, find the molar amounts of C and H in the sa...

Question: 6.12

Calculating a Percent Composition from a Formula Glucose, or blood sugar, has the molecular formula C6H12O6. What is the empirical formula, and what is the percent composition of glucose? ...

Verified Answer:

STRATEGY AND SOLUTION The empirical formula is fou...

Question: 6.11

Calculating an Empirical Formula from a Percent Composition Vitamin C (ascorbic acid) contains 40.92% C, 4.58% H, and 54.50% O by mass. What is the empirical formula of ascorbic acid? STRATEGY Assume that you have 100.00 g of ascorbic acid, and then carry out the procedure outlined in Figure 6.3. ...

Verified Answer:

First, find the number of moles of each element in...

Question: 6.7

Finding the Mass of One Reactant, Given the Mass of Another Aqueous solutions of sodium hypochlorite (NaOCl), best known as household bleach, are prepared by reaction of sodium hydroxide with chlorine. How many grams of NaOH are needed to react with 25.0 g of Cl2? ...

Verified Answer:

First, find out how many moles of

Cl_2[/lat...

Question: 6.16

Diluting a Solution How would you prepare 500.0 mL of 0.2500 M NaOH solution starting from a concentration of 1.000 M? STRATEGY The problem gives initial and final concentrations (Mi and Mf) and final volume (Vf) and asks for the initial volume (Vi ) that we need to dilute. Rewriting the equation ...

Verified Answer:

V_{\mathrm{i}}=\frac{\mathrm{M}_{\mathrm{f}...

Question: 6.14

Calculating the Molarity of a Solution What is the molarity of a solution made by dissolving 2.355 g of sulfuric acid (H2SO4) in water and diluting to a final volume of 50.0 mL? STRATEGY Molarity is the number of moles of solute per liter of solution. Thus, it’s necessary to find the number of ...

Verified Answer:

Mol. wt. of

H_2SO_4 = (2 \times 1.0) + (32....

Question: 6.17

Reaction Stoichiometry in Solution Stomach acid, a dilute solution of HCl in water, can be neutralized by reaction with sodium hydrogen carbonate, NaHCO3, according to the equation HCl(aq) + NaHCO3(aq) → NaCl(aq) + H2O(l) + CO2(g) How many milliliters of 0.125 M NaHCO3 solution are needed to ...

Verified Answer:

We first have to find how many moles of HCl are in...