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
sveta [45]
3 years ago
15

How many atoms of chromium are in 0.86 mol of potassium chromate (K2CrO4)?

Chemistry
1 answer:
9966 [12]3 years ago
3 0
<h2>Answer:</h2>

Atoms of Cr in 0.86 mol of K2CrO4 = 0.86 × 6.02*10^23 = 5.177 * 10^23 atoms.

<h3>Explanation:</h3>
  • One mol of K2CrO4 contains 6.02*10^23 molecules of K2CrO4.
  • One K2CrO4  contains 1 atom of Cr.
  • So 0.86 mol of K2CrO4 contain 0.86 * 6.02*10^23.
  • Which is equal to  5.177 * 10^23 atoms.

You might be interested in
Phosphoglucoisomerase interconverts glucose 6‑phosphate to, and from, glucose 1‑phosphate.
lawyer [7]

Answer:

Keq = 0.053

7.3 kJ/mol

Explanation:

Let's consider the following isomerization reaction.

glucose 6‑phosphate ⇄ glucose 1 - phosphate

The concentrations at equilibrium are:

[G6P] = 0.19 M

[G1P] = 0.01 M

The concentration equilibrium constant (Keq) is:

Keq = [G1P] / [G6P]

Keq = 0.01 / 0.19

Keq = 0.053

We can find the standard free energy change, ΔG°, of the reaction mixture using the following expression.

ΔG° = -R × T × lnKeq

ΔG° = -8.314 J/mol.K × 298 K × ln0.053

ΔG° = 7.3 × 10³ J/mol = 7.3 kJ/mol

7 0
3 years ago
What is the pH of a solution when the [OH - ] = 1 x 10 -3
dsp73

Answer:

The pH is 11

Explanation:

Because pH + pOH = 14

and pOH = - log [OH⁻] = - log (1 x 10⁻³) = 3

we can now calculate pH by manipulating equation one above

pH = 14 - pOH = 14 - 3 = 11

Thus the pH of the solution is 11

8 0
3 years ago
Energy can interact with objects and cause them to ________ or change
scoundrel [369]

Answer:contact forces or transfer energy(not sure)

Explanation:

6 0
3 years ago
What kind of plant growth hormone to regular plant growth. We dissolve 5.0 mg of the solution into 2.0 kg of water. What is the
In-s [12.5K]

Answer:

The dosage of the solution is 2.5 parts per million.

Explanation:

The solvent proportion in parts per million is equal to the ratio of solution in miligrams to ratio of water in miligrams multiplied by a million. (A kilogram is equivalent to a million miligrams) That is:

p.p.m. = \frac{5\,mg}{2000000\,mg}\times 1000000

p.p.m. = 2.5\, ppm

The dosage of the solution is 2.5 parts per million.

3 0
3 years ago
Why is the C-14/C-12 ratio used to date once-living organisms?
ki77a [65]
Because C-12 is fixed value of any organisms but the value of C-14 is constantly decreasing by time thats why every organism have their specific ratio of C14/C12
8 0
3 years ago
Other questions:
  • What is nascent hydrogen​
    12·2 answers
  • A tank contains 9000 L of pure water. Brine that contains 20 g of salt per liter of water is pumped into the tank at a rate of 2
    5·1 answer
  • • When one organism eats another organism, what % of the energy from the organism consumed is actually available to the consumer
    7·1 answer
  • Solid lithium iodide decomposes into solid lithium and iodine gas . Write a balanced chemical equation for this reaction.
    13·1 answer
  • What type of reaction is Mg + Cl^2&gt;MgCl^2
    9·1 answer
  • Given that a particular photon has a frequency of 2.2 x 10'7 Hz, calculate the photon's energy. Submit your answer in
    9·1 answer
  • Which chemical equation is balanced?
    10·1 answer
  • What the recipe of momo​
    11·1 answer
  • A cell phone manufacturer recalled some 50 million lithium batteries installed in cell phones because the batteries were at risk
    11·1 answer
  • What are the characteristics of nonvascular plants? (select all that apply) A . They don’t rely on roots to receive water.
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!