1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
AVprozaik [17]
3 years ago
8

What is the molarity of a solution in which 25.3 grams of potassium bromide is dissolved in 150. mL of solution?

Chemistry
2 answers:
irga5000 [103]3 years ago
6 0

Answer:

~1.417M

Explanation:

Molarity=(number of moles of solute)/(litres of solution)

In this case, we need to find moles of potassium bromide.

Mass=25.3g

Molar mass= 119g/mol

moles=(mass/molar mass)

        =(25.3)/(119)

        =0.2126moles of potassium bromide

Molarity=(0.2126)/(150/1000)

       ~1.417M

Hope this helps:)

Archy [21]3 years ago
5 0

Answer:

\boxed {\boxed {\sf molarity \approx 1.42 \ M \ KBr}}

Explanation:

Molarity is a measure of concentration in moles per liter.

molarity= \frac{moles \ of \ solute}{ liters \ of \ solution}}

<h3>1. Find Formula for Compound </h3>

We have the compound potassium bromide. Potassium (K) has an oxidation state of +1 and bromine (Br) has -1. They bond in a 1:1 ratio, so the formula is <u>KBr.</u>

<h3>2. Convert Grams to Moles</h3>

We are given the amount of solute in grams, but we need moles. To convert, we use the molar mass. These values are found on the Periodic Table. They are the same as the atomic masses, but the units are grams per moles (g/mol) instead of atomic mass units (amu).

Look up the individual element's molar mass.

  • Potassium: 39.098 g/mol
  • Bromine: 79.90 g/mol

The formula of KBr contains no subscripts, so we can add the molar masses.

  • KBr: 39.098+ 79.90 =118.99 g/mol

Use the molar mass as a ratio.

\frac {118.998 \ g\ KBr}{ 1 \ mol \ KBr}

We want to convert 25.3 grams, so we multiply by that value.

25.3 \ g\ KBr*\frac {118.998 \ g\ KBr}{ 1 \ mol \ KBr}

Flip the ratio so the units of grams of KBr cancel.

25.3 \ g\ KBr*\frac{ 1 \ mol \ KBr}{118.998 \ g\ KBr}

25.3*\frac{ 1 \ mol \ KBr}{118.998} = 0.2126086153\ mol \ KBr

<h3>3. Convert Milliliters to Liters </h3>

Molarity uses liters, so we must convert the 150 milliliters. 1 liter contains 1000 milliliters.

\frac{1 \ L }{1000 \ ml}

150 \ mL *\frac{1 \ L }{1000 \ ml}

150  *\frac{1 \ L }{1000}= 0.150 \ L

<h3>4. Calculate Molarity </h3>

Now we have the moles of solute and liters of solution, so we can find molarity.

molarity= \frac{ moles \ of \ solute}{liters \ of \ solution}

molarity= \frac{0.2126086153 \ mol \ KBr}{ 0.150 \ L}

molarity = 1.417390768\ mol KBr/L

The original measurements had 3 significant figures, so our answer must have the same. For the number we found, that is the hundredth place. The 7 in the thousandth place tells us to round the 1 to a 2.

molarity \approx 1.42 \ mol KBr/L

1 mole per liter is equal to 1 Molar (M), so we must convert the units.

molarity \approx 1.42 \ M \ KBr

You might be interested in
PLEASE HELP
torisob [31]

Decrease

Increase  

Increase

Decrease

Increase

Decrease

Hope this helps! :)

4 0
3 years ago
What is the correct name of the compound Pb(NO3)2?
Margaret [11]

Answer:

it's lead (ii) nitrate the name

4 0
2 years ago
Has anyone ever done this atom escape room thing
SVEN [57.7K]

Answer:

1.  negative

2.  positive

3.  neutral

Explanation:

Ok so it looks like they are asking for the charge (positive, negative, or neutral) of each thing

So for 1, it would be negative, because it's pointing to an electron.  Electrons always have a negative charge.

So for 2, it would be positive, because it's pointing to a proton.  Protons always have a positive charge

So for 3, it would be neutral, because it's pointing to a neutron.  Neutrons always have a neutral charge.

4 0
3 years ago
Which one of the following Acids is most likely to hurt you? Acid A: 1.0 M; Acid B: 0.0001M
vaieri [72.5K]
Acid A, assuming the two acids have the same pH. The M stands for molarity which is how concentrated a substance is (basically the higher the molarity the more concentrated the acid is). However, pH refers to how acidic a substance is. If the two acids have different levels of acidity, the answer may be different.
7 0
3 years ago
What is the first step of a ladybug during the growth and development process​
Sunny_sXe [5.5K]

Answer:

Damian here! (ノ◕ヮ◕)ノ*:・゚✧

The newly hatched larva is in its first instar, a developmental stage that occurs between molts. It feeds until it grows too big for its cuticle, or soft shell, and then it molts. After molting, the larva is in the second instar. Ladybug larvae usually molt through four instars, or larval stages, before preparing to pupate.

Explanation:

hope this helps? :))

7 0
3 years ago
Other questions:
  • By inbvbsidiejebdhene
    10·1 answer
  • Why are hydrogen ions and hydroxide ions omitted from the net reaction for the hydrolysis of water?
    6·2 answers
  • Coal and Diamond are two different form of carbon. which is denser?​
    13·2 answers
  • Atoms of which types of elements tend to gain electrons? Atoms of which types of elements tend to lose electrons?
    9·1 answer
  • Use the drop-down menus to select the part of Earth best described by each phrase.
    12·2 answers
  • Does water have greater heat of fusion or greater heat of vaporization?
    5·1 answer
  • Can you help me please ​
    9·1 answer
  • Wetlands provide habitats for many living things because of their sheltered waters and what other feature?
    8·1 answer
  • Identify the term that matches each definition.
    15·1 answer
  • Which of these substances are most likely crystalline solids? Select all that apply.
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!