Calculate the molarity of each solution. a. 0.38 mol of LiNO 3 in 6.14 L of solution b. 72.8 g C 2 H 6 O in 2.34 L of solution c. 12.87 mg KI in 112.4 mL of solution

Hi everyone. So here we ask for the concentration and hilarity of 458 mg of protesting oxide that is resolved in 50.6 millions of solution. Recall that polarity. It was malls a salute divided by leaders of the solution. Since we're giving milligrams of potassium outside, we need to convert this two g of potassium oxide. We need to convert to moles of potassium oxide and plug into similarity equation. We have 458 kilograms of potassium oxide and we have 1000 mg equal to 11 g. So now these are gonna cancel out. So now we need to use the Mueller mask in order to convert to moles of potassium oxide. Similar mass. I'll be testing outside. It's gonna be too because we have two potassium times the mass of potassium which is 39 0.98 gramps. We need to add the mass of oxygen which is 15 0. g. And this will give us 94 wait two grounds and that is in one mold of potassium oxide. So now this will give us 0.0 models of potassium oxide. And since we have our volume in milliliters, I'm gonna need to convert from male leaders. Two leaders. We can play this time hilarity equation and software similarity. 50.6 male leaders. We have 1000 mL and one leader. So now these cancel out. And this will give us 0.5. There are six leaders. So now going back to our maturity equation, we're gonna have malaria which is X, which is what we're solving for. You were two moles, which is going to be 0.0 486 malls. But by the volume, which is going to be 0.5 06 leaders. And it's gonna give us zero 0.961 polar, Which is going to be deep. Thanks for watching my video. And I hope it was helpful.

Ch.4 - Chemical Quantities & Aqueous Reactions

All textbooks

Tro 4th Edition

Ch.4 - Chemical Quantities & Aqueous Reactions

Problem 54

Chapter 4, Problem 54

Calculate the molarity of each solution. a. 0.38 mol of LiNO₃ in 6.14 L of solution b. 72.8 g C₂H₆O in 2.34 L of solution c. 12.87 mg KI in 112.4 mL of solution

Verified step by step guidance

Identify the formula for molarity: Molarity (M) = \( \frac{\text{moles of solute}}{\text{liters of solution}} \).

For part (a), use the given moles of LiNO_3 and volume of solution to calculate molarity: \( M = \frac{0.38 \text{ mol}}{6.14 \text{ L}} \).

For part (b), first convert the mass of C_2H_6O to moles using its molar mass (46.08 g/mol for ethanol), then calculate molarity: \( \text{moles} = \frac{72.8 \text{ g}}{46.08 \text{ g/mol}} \) and \( M = \frac{\text{moles}}{2.34 \text{ L}} \).

For part (c), convert the mass of KI from mg to g (1 mg = 0.001 g), then to moles using its molar mass (166.00 g/mol for KI), and convert the volume from mL to L (1 mL = 0.001 L), then calculate molarity: \( \text{moles} = \frac{12.87 \text{ mg} \times 0.001 \text{ g/mg}}{166.00 \text{ g/mol}} \) and \( M = \frac{\text{moles}}{0.1124 \text{ L}} \).

Ensure all units are consistent and calculations are correct to find the molarity for each solution.>

Verified video answer for a similar problem:

This video solution was recommended by our tutors as helpful for the problem above.

Video duration:

Was this helpful?

Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Molarity

Molarity is a measure of concentration defined as the number of moles of solute per liter of solution. It is expressed in units of moles per liter (mol/L). To calculate molarity, you divide the amount of solute (in moles) by the volume of the solution (in liters). This concept is essential for understanding how concentrated a solution is and is commonly used in chemistry for preparing solutions.

Moles and Molar Mass

A mole is a unit in chemistry that represents 6.022 x 10²³ entities, such as atoms or molecules. The molar mass of a substance, expressed in grams per mole (g/mol), is the mass of one mole of that substance. To convert grams to moles, you divide the mass of the substance by its molar mass. This conversion is crucial for calculating molarity when the solute is given in grams.

Volume Conversion

Volume is often measured in liters (L) in chemistry, but it can also be expressed in milliliters (mL). To convert milliliters to liters, you divide the volume in milliliters by 1000. Accurate volume measurement is important for calculating molarity, as the concentration depends on the total volume of the solution. Understanding these conversions ensures that calculations are performed correctly.