Consider this question: What is the mass of solute in 200.0 L of a 1.556-M solution of KBr ? (a

step 1 All right. So I have a solution off potassium bromide. What I'm given is the volume which I know

Consider this question: What is the mass of solute in 200.0...

Key Concepts

Molar Mass

Molar mass is the mass of one mole of a substance, usually expressed in grams per mole (g/mol). It is calculated by summing the atomic masses of all atoms in the molecule. This value allows for the conversion from moles to grams, making it essential for quantifying the mass of a substance based on its mole quantity.

Mass Calculation

Mass calculation involves converting the amount of substance in moles into mass by multiplying by the molar mass. This step uses the relationship that mass equals moles multiplied by the molar mass, providing a direct route to determine the physical quantity of the solute expressed in grams from its mole count.

Molarity

Molarity is a measure of the concentration of a solution. It is defined as the number of moles of solute present per liter of solution. This concept is fundamental in solution chemistry and is used to relate the amount of substance in a solution to its volume, aiding in the calculation of various solution properties.

Volume-to-Moles Conversion

Once the molarity is known, the volume of the solution can be used to calculate the number of moles of solute present by multiplying the molarity by the volume in liters. This step converts a concentration into an explicit amount of substance, which is a crucial intermediary step for further calculations involving chemical quantities.

Transcript

00:06 All right.

00:07 So i have a solution off potassium bromide.

00:14 What i'm given is the volume which i know is 200 litres on the concentration off my solution, which has given us 1.556 smaller on dhe.

00:30 I know that 1.556 smaller is equivalent to 1.556 molds per liter adjusted this unit conversion because it will make my life easier in the next steps, i'm given the volume on the constitution on what's required of me.

00:54 That's right.

00:54 A t.

00:54 U.

00:56 Required is the math right.

01:04 In order to proceed with this problem, i'm gonna use two equations and stock you metric chemistry.

01:12 The 1st 1 is that the concentration off any solution is equal to the number of malls off the compound in the solution over the volume of the solution.

01:25 The next equation i'm going to use is that the mass off a compound is equal to the number of morals of the compound times its molecular reet.

01:37 So rearranging the first equation, i could get that the number of malls is equal to the concentration times the volume.

01:49 And then i could find my molecular rates from the periodic table.

01:54 And then i could substitute this number of moles over here in order to find the mass.

02:01 So let's start.

02:04 So, as we said, number of malls is concentration times volume.

02:12 I'm given the concentration to be 1.556 and go.

02:16 I'm gonna include the units to make sure they cancel out.

02:19 And i don't mess up any unit conversions.

02:22 The surveillance is gonna be malls per liter or one moeller on volume is 200 litres.

02:31 As you could see it later and litter cancel out on what i would get is 311.12 months.

02:45 The next step is to step number two can clete m.

02:54 R.

02:55 The realclear wait could be added or could be figured out from the atomic mass number of the constituent elements off my solution.

03:03 My solution is a solution of potassium bromide...

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