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
KiRa [710]
3 years ago
6

A solution with the concentration of 0.15 M is made using 8.00 grams of K2CrO4. How many milliliters of H2O should be used?

Chemistry
1 answer:
babymother [125]3 years ago
6 0

Answer:

274.7mL

Explanation:

Molarity is defined as the number of mols of solute per liter of the solvent. Here, the solute is potassium chromate (K_{2}CrO_{4}) and the solvent is water. Hence, molarity is defined as the number of mols of potassium chromate per litre of water. And this molarity is equal to 0.15M.

Now, the molar mass of potassium chromate can be found by simply adding the atomic masses of the component atoms. This is equal to : 2×atomic mass of potassium + 1×atomic mass of chromium + 4×atomic mass of oxygen = 2×39 + 52 + 4×16 = 194g /mol.

The number of mols of potassium chromate is the ratio of the given mass of potassium chromate to the molar mass of potassium chromate.

Here, this is equal to \frac{8}{194} = 0.0412 mols.

This much potassium chromate is present in 'V' litres of water. Hence, molarity is given by : 0.15 = \frac{0.0412}{V}.

Thus, V = \frac{0.0412}{0.15} = 0.2747L = 274.7mL

You might be interested in
What change would you expect on the rate of the SN2 reaction of 1-iodo-2-methylbutane with cyanide ion if the nucleophile concen
n200080 [17]

Answer:

no effect

Explanation:

In an SN2 reaction, the mechanism is bi-molecular and first order in both the alkyl halide and the nucleophile.

Hence the rate of reaction is;

Rate = k [1-iodo-2-methylbutane] [cyanide ion]

Given that it is a bimolecular reaction, if we double the concentration of 1-iodo-2-methylbutane and the concentration of the cyanide ion is halved, the rate of reaction remains the same.

6 0
3 years ago
The graph above represents an object moving with a __________________. A) constant velocity B) constant acceleration C) constant
Ann [662]

Answer: I think its C or B

Explanation: Hope this was helpful....

4 0
3 years ago
Which functional group does the molecule below have?
Andrei [34K]

Answer:

Hydroxyl

Explanation:

A hydroxyl group is a functional group that attaches to some molecules containing an oxygen and hydrogen atom, bonded together. Also spelled hydroxy, this functional group provides important functions to both alcohols and carboxylic acids.

3 0
3 years ago
Coal and petroleum are useful because the both have ___ stored in them.
gizmo_the_mogwai [7]
I think the answer is 4 carbon dioxide
5 0
3 years ago
Read 2 more answers
What is amu of 99 % H-1, .2% H-1 and .8% H-3
ankoles [38]

The average atomic mass of your mixture is 1.03 u .

The average atomic mass of H is the weighted average of the atomic masses of its isotopes.  

We multiply the atomic mass of each isotope by a number representing its relative importance (i.e., its % abundance).  

Thus,  

0.99    × 1.01 u = 0.998 u

0.002 × 2.01 u = 0.004 u

0.008 × 3.02 u = <u>0.024 u</u>

            TOTAL =  1.03   u

4 0
3 years ago
Other questions:
  • How is oxygen separated from other substances nearby?
    11·1 answer
  • Remember that each amino acid change is caused by a single nucleotide substitution. Use this information to further limit the po
    15·1 answer
  • A measurement has two parts a number and a
    11·1 answer
  • The negative particles inside an atom are called???
    10·1 answer
  • What atoms are found in the phosphate group?
    6·2 answers
  • What caused the moon to become a sphere<br> A. Gravity<br> B. atmosphere<br> C. gases<br> D. orbit
    9·1 answer
  • Balance the foll. equations
    12·2 answers
  • Calculate the number of moles in 125g of Copper (II) Hydroxide. URGENT!
    11·1 answer
  • Which statement about quantum numbers is NOT
    14·1 answer
  • What is the mass of 3.2 L of water in centigrams?
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!