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
babymother [125]
1 year ago
5

Calculate the mole fraction of kbr (molar mass 119.00 g/mol) in a solution made by dissolving 0.30 g kbr in 0.400 l of H2O (d =

1.00 g/ml; molar mass 18.02 g/mol).
Chemistry
1 answer:
julia-pushkina [17]1 year ago
6 0

The mole fraction of KBr in the solution is 0.0001

<h3>How to determine the mole of water</h3>

We'll begin by calculating the mass of the water. This can be obtained as follow:

  • Volume of water = 0.4 L = 0.4 × 1000 = 400 mL
  • Density of water = 1 g/mL
  • Mass of water =?

Density = mass / volume

1 = Mass of water / 400

Croiss multiply

Mass of water = 1 × 400

Mass of water = 400 g

Finally, we shall determine the mole of the water

  • Mass of water = 400 g
  • Molar mass of water = 18.02 g/mol
  • Mole of water = ?

Mole = mass / molar mass

Mole of water = 400 / 18.02

Mole of water = 22.2 moles

<h3>How to de terminethe mole of KBr</h3>
  • Mass of KBr = 0.3 g
  • Molar mass of KBr = 119 g/mol
  • Mole of KBr = ?

Mole = mass / molar mass

Mole of KBr = 0.3 / 119

Mole of KBr = 0.0025 mole

<h3>How to determine the mole fraction of KBr</h3>
  • Mole of KBr = 0.0025 mole
  • Mole of water = 22.2 moles
  • Total mole = 0.0025 + 22.2 = 22.2025 moles
  • Mole fraction of KBr =?

Mole fraction = mole / total mole

Mole fraction of KBr = 0.0025 / 22.2025

Mole fraction of KBr = 0.0001

Learn more about mole fraction:

brainly.com/question/2769009

#SPJ1

You might be interested in
An atom of this element has _____ shells and _____ valence electrons.
Dmitry_Shevchenko [17]

Answer:

1 orbital (shells) and 1 valence electron

Explanation:

If an atom of hydrogen is a neutral atom, it will have 1 proton in the nucleus and 1 electron in the electron shell.

4 0
3 years ago
How many moles are in 63 g of NH4 (molar mass= 18g)?
sdas [7]

To answer this question, all you to do is to divide the mass by the molar mass and that should get you your moles.

=63g\ NH_{4}\ x\ \frac{1\ mol\ NH_{4}}{18g\ NH_{4}}

<em>= 3.5 mol NH₄</em>

<em></em>

<em></em>

4 0
2 years ago
Read 2 more answers
Which of the following is a correct observation when water is added to quick lime?
masya89 [10]

Answer:

c

Explanation:

thw observation of water that is added

7 0
3 years ago
Read 2 more answers
Observe: click reset. select the gas collection setup. chemists use this apparatus to collect any gases produced in the reaction
Oxana [17]

Hello. Although it is not possible to see the video to which the question refers, we can see, in the question, that water is removed from the cylinder as a gas is added to the same cylinder. So we can see that a gas was produced in the reaction, through the displacement of water, that is, if the water starts to be removed from the cylinder, it is because the reaction is producing a gas. If the gas is not produced, water will not come out of the cylinder.

6 0
2 years ago
What will be the new volume of a 250 mL sample of gas at 300 K and 1 atm if heated to 350 K at 1 atm? Law used:
ladessa [460]
Using Charles's law; which states that the volume of an ideal gas is directly proportional to the absolute temperature at constant pressure. 
That is; V α T
Hence; V1/T1 = V2/T2 = constant
V2 =  V1 × (T2/T1)
    = 250 × (350/300) = 291.67 mL
Therefore; the new volume will be 291.67 mL
3 0
3 years ago
Read 2 more answers
Other questions:
  • Name an element in the fourth period (row) of the periodic table with three 3d electrons.
    15·1 answer
  • Which factor is generally responsible for high melting points?
    10·2 answers
  • If 15.0 grams of ca combines completely with 12.0 grams of s to form a compound, what is the percent composition of s in the com
    5·2 answers
  • Marvin records scientific data about Lake Superior. For which property has Marvin forgotten to use an SI unit of measurement?
    7·2 answers
  • Whats the atomic number of an electron?
    6·1 answer
  • While in Europe, if you drive 125 km per day, how much money would you spend on gas in one week if gas costs 1.10 euros per lite
    8·1 answer
  • Which statement correctly describes the conductivity of the specified material?
    12·1 answer
  • Hydrogen can be produced according to the following word equation
    12·1 answer
  • Carbon dioxide is a compound of the elements carbon and oxygen (CO2). What happened to the carbon and oxygen to create this comp
    9·1 answer
  • Read image for instructions A heterogeneous mixture B moleculeC liquid D homogeneous mixture
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!