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
andrey2020 [161]
3 years ago
13

Calculate the molarity of a solution obtained dissolving 10.0 g of cobalt(Ⅱ) bromide tetrahydrate in enough water to make 450 mL

of solution
a. 6.80 × 10-2
b. 7.64 × 10-2
c. 7.64 × 10-5
d. 7.51 × 10-2
e. 0.102 M
Chemistry
1 answer:
Vladimir [108]3 years ago
8 0

Answer:

<em><u>The molarity of the CoBr2•4H2O solution is  7.64 × 10-2 M</u></em>

Explanation:

Cobalt (II) bromide tetrahydrate

• Cobalt - A transition metal with Roman numeral (II) → charge: +2 → Co2+

• Bromide - anion from group 7A → -1 charge → symbol: Br-

• Tetrahydrate- tetra- means 4 and hydrate is H2O

The chemical formula of the compound is: CoBr2•4H2O

We then need to determine the number of moles of CoBr2•4H2O since this is the only information missing for us to find molarity. Notice that the volume of the solution is already given.

We’re given the mass of CoBr2•4H2O. We can use the molar mass of CoBr2•4H2O4 to find the moles.

•The molar mass of CoBr2•4H2O is:

CoBr2•4H2O  

1 Co x 58.93 g/mol Co = 58.93 g/mol

2 Br x 79.90 g/mol Br = 159.80 g/mol

8 H  x 1.008 g/mol H = 8.064 g/mol

4 O  x 16.00 g/mol O = 64.00 g/mol

________________________________________

                           Sum = <u>290.79 g/ mo</u>

The moles of CoBr2•4H2O is:

= 10.0 g CoBr2•4H2O x  \frac{ 1 mol  CoBr_2 . 4H_2O}{290.79 g CoBr_2 .  4H_2O}

= <u>0.0344  mol CoBr2•4H</u>

We know that the volume of the solution is 450 mL.

We can now calculate for molarity:

Convert mL to L → 1 mL = 10-3 L

Formula:

Molarity (M)= Mole of solute / Liters of solution

= 0.0344  mol CoBr2•4H  / 450 mL x 1 ml / 10^ -3 L

= 0.0764

=  7.64 × 10-2 mol/L

You might be interested in
What will the outcome of putting litumus paper into distilled water
Kay [80]
If it is blue litmus paper, it will remain blue. If it is red litmus paper, it will remain red. Water is neither an acid nor a base so it will not change the litmus paper.
5 0
3 years ago
10. pls pls help me
vagabundo [1.1K]

Answer:

2c2h2+502=4co2+H2O

Explanation:

this is the answer

8 0
3 years ago
Help me out please!?
Sholpan [36]

Answer:

area a

Explanation:

6 0
3 years ago
PLEASE HURRY UP!! I DON'T HAVE ALL DAY!
neonofarm [45]

B: The total thermal energy is greater in a large body of water than one much smaller

Explanation:

A large lake filled filled with cool water will have more thermal energy than smaller pond filled with warmer water because the total thermal energy is greater in a large body of water than one that is much smaller.

Thermal energy is a form of kinetic energy usually due to transfer of heat energy.

Amount of heat energy is dependent on the differences in temperature, mass and specific heat capacity of a body.

Both lake water will have the same specific heat capacity. Since larger body of water has more mass, it will possess more thermal energy.

learn more:

Specific heat capacity brainly.com/question/7210400

Thermal energy brainly.com/question/914750

#learnwithBrainly

7 0
3 years ago
Be<br><br> Name the element.<br><br> Number of shells?<br><br> Valence electrons?
Vedmedyk [2.9K]

Answer:

Name the element: Beryllium

Number of shells:  4

Valence electrons: 2

Explanation:

4 0
3 years ago
Other questions:
  • Why do atoms always contain the same number of electrons and protons?
    5·2 answers
  • You must answer all questions to get credit for this assignment. Use the notes above and/or the textbook to help you find the an
    5·1 answer
  • Which chamber collects blood from the lungs that is rich in oxygen?
    6·1 answer
  • What is the ph value of water and salt?
    5·1 answer
  • If silicon has a charge of -4, how many electrons does it have
    10·1 answer
  • Does potassium nitrate (KN03) incorporate ionic bonding, covalent bonding, or both? Explain.
    7·1 answer
  • Witch of the following best describes a gene
    5·2 answers
  • 2. Which of the following is a physical property that Mendeleev used to design the periodic table?
    15·1 answer
  • 2)
    14·1 answer
  • Which one allows you to obtain the most precise volume? Circle one.the first one on the right because it's too ee and also helps
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!