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
Bumek [7]
3 years ago
14

36g of KOH dissolved in 800mL of water. What is the molality of the solution?

Chemistry
1 answer:
Zanzabum3 years ago
6 0

Answer:

0.80m of KOH

Explanation:

Molality is an unit of concentration defined as the ratio between moles of solute and kg of solvent.

In the problem, the solute is KOH and solvent is water.

Moles of 36g KOH -Molar mass: 56.1g/mol- are:

36g KOH × (1mol / 56.1g) = <em>0.642 moles of KOH</em>

<em></em>

Now, as density of water is 1g/mL, mass of 800mL of water is:

800mL × (1g / mL) × (1kg / 1000g) = <em>0.800kg of water</em>

<em></em>

Thus, molality is:

0.642moles of KOH / 0.800kg = <em>0.80m of KOH</em>

You might be interested in
A student observed a chemical reaction in which the mass of the products was measured to be less than the mass of the reactants.
nika2105 [10]

There chemical reactions that can realise or absorb gas to the atmosphere. This means it is harder or impossible to measure it with normal weighing devices and normal taring equipment. As a principal in chemical reactions we have conservation of mass.

5 0
2 years ago
What are some chemical properties of acids and bases ? Please help!!
rusak2 [61]
Is it DDNAya I think it's dna
7 0
2 years ago
What is a change in which energy is released is called
inessss [21]

Answer: Chemical Reactions

Explanation:

Chemical reactions often involve changes in energy due to the breaking and formation of bonds.

4 0
2 years ago
Four different methods are described for validating the results of a particular analysis. Indicate for each whether the method p
il63 [147K]

Answer:

A) Precision

B) Accuracy

C) Precision

D) Accuracy

Explanation:

<em>Accuracy</em> and <em>Precision </em>are factors that determine whether a given analysis is appropiate or not.

Accuracy refers to how close the experimental result is to a <em>known, theoretical or accepted value. </em>For this reason every method that checks the accuracy uses a standard -this could mean repeating the test using the standard instead of the sample, or adding a known amount of analyte to the sample-, in order to compare the results.

Precision refers to how close repeated the results of different tests are to each other, in other words, it refers to the <em>repeatability </em>of the method. A test for precision would require that the method is done several times, in order to check how close the results are to each other, regardless of whether those results are close to the expected value.

7 0
2 years ago
Describe how continents and oceans are carried on tectonic plates
avanturin [10]
They are like carried by the convection in the mantle which is pulsing or pushing the plates upwards. the earth kind of "floats" in ways. mostly its just pressure from the mantle and center of the earth pushing the plates upward and out.
8 0
2 years ago
Other questions:
  • 2.822 mol of nickel has _________ atoms of nickel.<br><br> (Enter just the number for this one.)
    6·1 answer
  • There are many different types of maps a map that shows the types of rocks or the age of rocks in an area is called a
    5·1 answer
  • Consider the following equilibrium:H2CO3(aq) + H2O(l) H3O+(aq) + HCO3-1(aq).What is the correct equilibrium expression?
    15·1 answer
  • What element is located in group 2, period 2?
    5·1 answer
  • Classify the following as an element, compound, homogeneous mixture, or heterogeneous mixture: iron (Fe)
    9·1 answer
  • 2. Calculate the molarity of a solution in which 0.50 moles of MgCl2 are dissolved to produce 1.5 liters
    14·1 answer
  • how much water must be added when 125 mL of a 2.00 M solution of HCl is diluted to a final concentration of 0.400M?
    8·2 answers
  • How do positive charges in the nucleus balance​
    15·1 answer
  • Sphalerite contains about 30% zinc. Calculate the maximum amount of zinc that could be obtained from 1000kg sphalerite.
    9·1 answer
  • How many moles are 3. 01 x 1022 atoms of magnesium?
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!