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
Komok [63]
3 years ago
13

A solution is formed by mixing 15.2 g KOH into

Chemistry
1 answer:
nikitadnepr [17]3 years ago
6 0

Answer:

There are approximately 0.271\; \rm mol of formula units in that \rm 15.2\; g of \rm KOH (the solute of this solution.)

Explanation:

A solution includes two substances: the solute and the solvent. Note the solution here contains significantly more water than \rm KOH. Hence, assume that water is the solvent (as it is in many other solutions.)

The (molar) formula mass of \rm KOH is necessary for finding the number of moles of

  • One \rm K atom,
  • One \rm O atom, and
  • One \rm  H atom.

The formula mass of \rm KOH will thus be the sum of:

  • The mass of one mole of \rm K atoms,
  • The mass of one mole of \rm O atoms, and
  • The mass of one mole of \rm H atoms.

On the other hand, the mass (in grams) of one mole of atoms of an element is (numerically) the same as its relative atomic mass. The relative atomic mass data can be found on most modern periodic tables.

Relative atomic mass data from a modern periodic table:

  • \rm K: 39.098.
  • \rm O: 15.999.
  • \rm H: 1.008.

For example, the relative atomic mass of \rm K (potassium, atomic number 19) is 39.098 (3 sig. fig.) Hence, the mass of one mole of

The formula mass of \rm KOH is the sum of these three masses:

\begin{aligned}& M(\mathrm{KOH}) \\ &\approx 39.098 + 15.999 + 1.008 \\ &= 56.105\; \rm g \cdot mol^{-1}\end{aligned}.

The number of moles of \rm KOH formula units in this 15.2\; \rm g sample would be:

\begin{aligned}n &= \frac{m(\mathrm{KOH})}{M(\mathrm{KOH})} \\ &\approx \frac{15.2\; \rm g}{56.105\; \rm g \cdot mol^{-1}} \approx 0.271\; \rm mol \end{aligned}.

You might be interested in
Acids increase the concentration of hydronium ions in solution by donating hydrogen ions to water molecules. True False
Kitty [74]

Answer:

Explanation:

General reaction of acid in water is as follows:

HCl + H2O = H3O+  + Cl-

Thus Acids increase the concentration of hydronium ions in solution by donating hydrogen ions to water molecules is true  

3 0
3 years ago
Read 2 more answers
1- DILUTIONS What will the volume be of a solution created using 120 mL of 4.50 M stock solution if the final molarity needs to
andreyandreev [35.5K]

Answer: 0.27 L

Explanation:

8 0
3 years ago
A sample of sugar (C12H22O11) contains
Lady_Fox [76]

4 moles of sugar.

Explanation:

A mole is defined as the amount of a substance contained in Avogadro's number of particles 6.02 x 10²³.

    1 mole of substance  = 6.02 x 10²³. molecules

Given that;

  the sample of sugar contains 1.505 x 10²³.molecules

  The number of moles in this amount of sugar is 4 moles

Learn more:

Number of moles brainly.com/question/13064292

#learnwithBrainly

5 0
3 years ago
Lewis Diagrams- Grade 10 Chemistry<br><br> Please can someone explain this to me?
natita [175]
Lewis diagram:
well first you have to know the Valence electrons the elements which will on top of the periodic table.

for examples:
H2O
it will be O-H-O and the dots will on top. oxygen have 6 valence electrons so that mean it need 6 dots. also for H it will have 7 V-electrons.
3 0
3 years ago
The molar mass of I2 is 253.80 g/mol, and the molar mass of NI3 is 394.71 g/mol. How many moles of I2 will form 3.58 g of NI3?
Nat2105 [25]
To answer the problem above first we need to find the difference of molar mass of NI3 from I2, 394.71 g/mol - 253.80 g/mol = 140.91 g/mol. Knowing the molar mass of the difference of NI3 from I2, in equation mass (g) / moles (mol) = molar mass, then we substitute. 3.58g / moles = 140.91 g/mol.
moles = 3.58 / 140.91 = 0.025 moles.
6 0
3 years ago
Other questions:
  • You are on an island and need freshwater to drink. Which process could you
    11·1 answer
  • Which type of compound dissociates?
    13·1 answer
  • A flask filled with oxygen is heated from 5 degrees Celsius to 30 degrees Celsius. The starting pressure was 50 kPa, what is the
    10·1 answer
  • Rate of diffusion depends upon:
    9·1 answer
  • Geometrically tetrahedral means that the electron groups have what angle? A. 120° B. 180° C. 90° D. 109.5°
    10·1 answer
  • An atom loses one of its neutrons. What changes about the atom?
    9·1 answer
  • What are the two factors that affect ionic bond formation? Additionally, can you describe the trends of one of these factors in
    6·1 answer
  • The effect of pH on the binding of oxygen to hemoglobin results in:
    14·1 answer
  • Can anyone explain this to me?
    14·1 answer
  • 3.00 L of a gas is collected at 35.0 C and 0.93 atm. What is the volume at STP
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!