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
dimulka [17.4K]
3 years ago
9

He mole fraction of potassium nitrate in an aqueous solution is 0.0194. The solution's density is 1.0627 g/ml. Calculate the mol

arity of the solution.
Chemistry
1 answer:
marusya05 [52]3 years ago
8 0

The solution contains potassium nitrate (KNO3) in water (H2O)

The molar mass of KNO3 = 101 g/mol

The molar mass of H2O = 18 g/mol

Mole fraction of KNO3 = 0.0194

Therefore mole fraction of H2O = 1 - 0.0194 = 0.9806

Total mass of the solution = KNO3 + H2O

= 0.0194 moles * 101 g/mol + 0.9806 moles * 18 g/mol

= 1.9594 g + 17.6508 = 19.6102 g

Volume of the solution = Mass of solution/density

= 19.6102 g/ 1.0627 g.ml-1 = 18.453 ml = 0.01845 L

Molarity of KNO3 = moles of KNO3/volume of solution

= 0.0194 mole/0.01845 L = 1.05 M

You might be interested in
The mass of water in a single popcorn kernel was found to be 0.905 grams after it popped at a temperature of 175 °C. Using the i
Rus_ich [418]

Answer:

0.583 kilojoules

Explanation:

The amount of heat required to pop a single kernel can be calculated using the formula as follows:

Q = m × c × ∆T

Where;

Q = amount of heat (J)

m = mass of water (g)

c = specific heat capacity of water (4.184 J/g°C)

∆T = change in temperature

From the given information, m = 0.905 g, initial temperature (room temperature) = 21°C , final temperature = 175°C, Q = ?

Q = m × c × ∆T

Q = 0.905 × 4.184 × (175°C - 21°C)

Q = 3.786 × 154

Q = 583.044 Joules

In kilojoules i.e. we divide by 1000, the amount of heat is:

= 583.04/1000

= 0.583 kilojoules

8 0
3 years ago
This characteristic of hydrogen and oxygen make the water molecule polar: ______.
Finger [1]

Answer:

thé answer is b ) electronegativity

5 0
3 years ago
I need help with all of these questions
mafiozo [28]
Number five is decrease
7 0
3 years ago
. Which information is NOT included in each square of the periodic table in your text? a. atomic number c. melting point b. chem
azamat
The correct answer is melting point
6 0
3 years ago
HELP PLEASE ITS JUST MULTIPLE CHOICE
morpeh [17]

Answer:

Atoms are indivisible

I had a hard time finding this out.

Explanation: Dalton's atomic theory was the first complete attempt to describe all matter in terms of atoms and their properties. Dalton based his theory on the law of conservation of mass and the law of constant composition. The first part of his theory states that all matter is made of atoms, which are indivisible.

6 0
3 years ago
Other questions:
  • Explain why unboiled water can be used to prepare an acetic acid solution, but not a naoh solution?
    12·1 answer
  • A mineral must be_______ rather than organic. Organic materials are formed from_______ things. Minerals must be made from materi
    9·1 answer
  • PLEASE ANSWER
    8·1 answer
  • Penicillinase, also known as β‑lactamase, is a bacterial enzyme that hydrolyzes and inactivates the antibiotic penicillin. Penic
    13·1 answer
  • which of the following is the smallest in volume? nucleus of oxygen atom, water molcule, protron, ice crystal, electron cloud of
    14·1 answer
  • Condensation requires? a) the removal of energy b)the absorption of energy. c) no energy change.
    8·2 answers
  • Which period is the shortest in the long form of the periodic table? Name all the
    13·1 answer
  • What is the maximum number of electrons an s subshell can have?
    6·2 answers
  • 2. How will you protect your eyes and skin from too much exposure to the sun?
    14·2 answers
  • How many grams are in 1,000 Lutheran of C2H4
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!