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
docker41 [41]
3 years ago
11

A solution is prepared by dissolving 4.40 g of KSCN in enough water to make 200 mL of solution. What is the concentration of the

solution?
Chemistry
2 answers:
AlladinOne [14]3 years ago
7 0

The concentration of solution is \boxed{{\text{0}}{\text{.22635 mol/L}}} .

Further explanation:

Mole is the S.I. unit and number of moles is calculated as the ratio of mass of the compound to that of molar mass of the compound. Molar mass is the mass of different atoms present in a molecule.

The expression of number of moles, mass and molar mass of compound is as follows:

{\text{Number of moles}}=\frac{{{\text{mass of the compound}}}}{{{\text{molar mass of the compound}}}}               …... (1)

Molarity:

The molarity of the solution can be defined as the concentration of the solution and is equal to the number of moles of the solute dissolved in 1 liter of the solution.

The expression to relate molarity (M), volume (V), and number of moles (n) is as follows:

{\text{M}}=\frac{{{\text{n}}\left({{\text{mol}}}\right)}}{{{\text{V}}\left({\text{L}}\right)}}       …… (2)

Here, V is a volume of solution in liters and n is a number of moles of solute.

Given mass of KSCN is 4.40 g.

Molar mass of KSCN is 97.1807 g/mol.

Substitute these values in equation (1) to calculate the number of moles of KSCN.

\begin{aligned}{\text{number of moles}}&=\frac{{{\text{4}}{\text{.40g}}}}{{{\text{97}}{\text{.1807g/mol}}}}\\&={\text{0}}{\text{.04527 mol}}\\\end{aligned}

The number of moles of KSCN is 0.04527 mol.

The conversion factor to convert volume in liter (L) to (mL) is as follows:

{\text{1L}}=1000\;{\text{mL}}

Given volume of solution is 200 mL.

Therefore, 200 mL of volume is converted into (L) as follows

\begin{aligned}{\text{Volume}}&=\,{\text{200 mL}}\left({\frac{{{\text{1}}\;{\text{L}}}}{{1000\;{\text{mL}}}}}\right)\\&={\text{0}}{\text{.2 L}}\\\end{aligned}

Number of moles of KSCN is 0.04527 mol.

Volume of solution is .02 L.

Substitute these values in equation (2) to calculate the concentration of solution.

\begin{aligned}{\text{M}}&=\frac{{{\text{0}}{\text{.04527 mol}}}}{{{\text{0}}{\text{.2 L}}}}\\&={\text{0}}{\text{.22635 mol/L}}\\\end{aligned}

Hence, the concentration of solution is 0.22635mol/L.

Learn more:

1.Write equation to show how cation act as an acid: <u>brainly.com/question/2396649</u>.

2. Determine the characteristics of mixtures: <u>brainly.com/question/1917079</u>.

Answer details:

Grade: Senior solution

Subject: Chemistry

Chapter: Mole concept

Keywords: Molar mass, KSCN, number of moles, concentration, volume, solute, 1 liter, molarity, 0.22635 mol/L.

attashe74 [19]3 years ago
4 0
First find the number of moles of KSCN is in 4.40g of KSCN 1. Number of moles = mass given (4.40g) / molecular weight(MW) (KSCN) - to calculate MW, look for each element in the periodic table and add their atomic weight 2. Convert 200mL to liters 3. Concentration = number of moles/ volume in liters from (#2)
You might be interested in
For 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g), if you begin with 16.00 g ammonia and excess oxygen, how many grams of water will be ob
iragen [17]
12.7 grams approximately
8 0
3 years ago
Which of these is a pure substance
Galina-37 [17]

Both A and B are the answer.


4 0
3 years ago
Which of the following did Mendeleev not believe in because he could not see them?
Zigmanuir [339]

Answer:atoms

Explanation:

6 0
3 years ago
The organic compound di‑n‑butyl phthalate, C 16 H 22 O 4 ( l ) , C16H22O4(l), is sometimes used as a low‑density ( 1.046 g ⋅ mL
damaskus [11]

Answer:

36.63 Torr

Explanation:

You need to use two expressions, one for pressure and the other with the relation of density and height of the column.

For the pressure:

P = h * d * g  (1)

h is height.

d density

g gravity

The second expression put a relation between the densities and height of the column so:

d1/d2 = h1/h2 (2)

let 1 be the phthalate, and 2 the mercury.

Let's calculate first the relation of density:

d1/d2 = 13.53 / 1.046 = 12.93

Now with the first expression, we can calculate the pressure so:

P = hdg

We have two compounds so,

h1d1g = h2d2g ---> gravity cancels out

From here, we can solve for h2:

h2 = h1*(d1/d2)

replacing:

h2 = 459 / 12.53

h2 = 36.63 mm

1 mmHg is 1 torr, therefore the pressure of the gas in Torr would be 36.63 Torr

8 0
3 years ago
What happens where Earth's plates meet?
anzhelika [568]

Answer:

an earthquake

Explanation:

the tectonic plates rub together sending shockwaves

4 0
3 years ago
Other questions:
  • Certain bacteria live in plant roots and receive sugars from the plants. The bacteria provide a source of useful nitrogen for th
    13·2 answers
  • The standard reduction potentials of lithium metal and chlorine gas are as follows:Reaction Reduction potential(V)Li+(aq)+e−→Li(
    5·1 answer
  • What volume would 3.01•1023 molecules of oxygen gas occupy at STP?
    6·1 answer
  • What is an electromagnet
    7·2 answers
  • 25 points!!! PLEASE HELP ASAP please answer both of these with work shown!!
    12·2 answers
  • A couple is planning to have a child. the father-to-be has six fingers, a dominant trait. His genotype is Ff. His wife has five
    12·1 answer
  • How are the sizes of stars measured?<br><br><br> I just need a simple answer
    5·1 answer
  • Convert the Following<br><br> 10 hm to cm
    12·1 answer
  • Considering the patterns you have noticed in this activity, which statement best explains why a compound with the molecular form
    15·1 answer
  • What is rainwater harvesting​
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!