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
fgiga [73]
3 years ago
14

18) Calculate the molarity

Chemistry
1 answer:
Sloan [31]3 years ago
4 0

Answer:

B. 0.92 M

Explanation:

Molarity of a solution = number of moles (n) ÷ volume (V)

According to the information provided in this question;

mass of NaCl = 42g

Volume of water = 780mL

Using mole = mass/molar mass

Molar mass of NaCl = 23 + 35.5 = 58.5g/mol

mole = 42/58.5

mole (n) = 0.72mol

Volume (V) = 780 mL = 780/1000 = 0.780 L

Hence, molarity = n/V

Molarity = 0.72/0.780

Molarity = 0.923 M

You might be interested in
Pls help: What is the net equation for CNO cycle?
Anna007 [38]

Answer:

The CNO cycle (for carbon–nitrogen–oxygen) is one of the two known sets of fusion reactions by which stars convert hydrogen to helium, the other being the proton–proton chain reaction (pp-chain reaction). Unlike the latter, the CNO cycle is a catalytic cycle.

3 0
3 years ago
Why must oxidation be accompanied by a reduction?
Crazy boy [7]

Answer:

A

Explanation:

because the species being oxidized shares electrons with the species that is reduced.making the oxidized element positively charged and the reduced element negatively charged.

I hope this helps

5 0
3 years ago
Read 2 more answers
Which of the following molecules or ions is polar? (20 POINTS)
inessss [21]

Answer:

All of these three are polar molecules or ions

Explanation:

1) CO3 ^2-

It is a polar ion because it consists of one Oxygen atom and three carbon atoms so there is a substantial electroegativity difference between carbon and Oxygen due to which shared electrons are attracted more towards Oxygen creating partial negative charge on it and less towards carbon creating a partial positive charge on it, which makes the overall ion polar.

2) HCN

HCN is a polar molecule because there is substantial electronegativity difference between Carbon and Hydrogen as well as between Carbon and Nitrogen. Due to this negative charge is induced over Nitrogen because electronegativity of Nitrogen is 3.0 and positive charge on Carbon because its electronegativity is 2.5. The overall molecule is polar.

3) NO3^-1

Nitrate ion is also a polar molecule because there are three atoms of Oxygen and one atom of Nitrogen. There is substantial electronegativity difference between oxygen (3.44) and nitrogen (3.0) due to which partial positive charge is created on Nitrogen and partial negative charge created over three Oxygen atoms. The overall molecule is polar.

Hope it helps!

8 0
4 years ago
At a pressure of 1.00 atm, the solubility of nitrogen in water is 23.5 mg gas/100 g water. Indicate whether each of the followin
marysya [2.9K]

Answer:

a) Solubility diminishes.

b) Solubility remains constant.

c) Solubility increases.

d) Solubility increases.

Explanation:

Hello,

a) In this case, we've got to take into account that the solubility of a gas into a liquid increases as the pressure does it (because the molecules are forced to gather with the liquid's particles) and the other way around, in such a way, as the pressure is decreased, the solubility is decreased as well.

b) Well, the outer space is related with the atmospheric pressure as long as the column of air is what is exerting the pressure, thus, as this pressure is quantified as 1 atm, there won't be any appreciable change in the solubility as the pressure remains the same.

c) Now, as the pressure is increased, the solubility is increased in a very similar way that in the a) part.

d) Submerging the solution 40m underwater means that the fluid's column above the solution is increased, thus, the pressure is increased, so the solubility is increased as well.

Best regards.

5 0
4 years ago
MOST of which of these types of organisms reproduces asexually?
Nuetrik [128]
Plants can produce asexually as well as protest so I would reject animals out of the choices. Now to determine the right answer we would have to decide which organisms MOST produce asexually and I would go with Plants
6 0
3 years ago
Other questions:
  • I have very good ability to conduct electricity. I am never found alorie in nature. When I combine with other elements, I usuall
    8·1 answer
  • The hydrogens and oxygen of a water molecule are held together by ______ bonds.
    14·2 answers
  • How is earths moon different from the moons of other planets
    10·2 answers
  • The balanced equation shows how sodium chloride reacts with silver nitrate to form sodium nitrate and silver chloride. NaCl + Ag
    9·1 answer
  • describe the motion of objects that are viewed from your reference frame from both inside and while you travel inside a moving v
    11·1 answer
  • Energy is involved in some way in all chemical reactions. Which type of reaction involves the absorption of energy from the surr
    13·1 answer
  • Products of MnO + CL2
    12·1 answer
  • What is the charge of a neutron? neutral negative positive
    11·1 answer
  • A student is studying the boiling points of six different liquids and finds results with consistently higher boiling points than
    15·1 answer
  • at a fixed temperature and pressure, a cylinder contains equal volumes of o2 and an unknown gas, weighing 20.0 g and 17.5 g resp
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!