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
ryzh [129]
3 years ago
5

A student dissolved 3.00 g of Co(NO3)2 in enough water to make 100. mL of stock solution. He took 4.00 mL of the stock solution

and then diluted it with water to give 275. mL of a final solution. How many grams of NO3- ion are in the final solution?
Chemistry
1 answer:
viktelen [127]3 years ago
5 0

Answer:

0.081g

Explanation:

first step:calculate the molar conc of the stock solution

molar conc=mass/molar mass ×1000/vol(ml)

molar mass of Co(N03)2=182.943

molar conc=3g/182.943 ×1000/100ml

=0.163M

To calculate the conc of the resulting solution we apply the dilution principle

n=cv

C1V1=C2V2

C1=conc of stock solution=0.163M

V1=4mL

V2=275ml(final volume)

by making 'C2" the subject C2=0.163×4/275

=0.0024M

by applying the formular for calculating molar conc of a solution,we can calculate the mass of CO(NO3)2 in the reulting solution

molar conc=mass/molar mass ×1000(L)/vol(mL)

mass=0.0024×182.943×275/1000

=0.1193g

Mass of CO(NO3)2  in the resulting solution=0.1199g

since CO+(NO3)2=CO(NO3)2

Percentage by mass of (NO3)2 in CO(NO3)2=(NO3)2/CO(NO3)2

=124/182.943×100

=67.8%

it means 67.8% of 0.1193g is the mass of (NO3)2=0.678×0.1199

=0.081g

You might be interested in
Temperature is an example of a categorical variable a quantitative variable either a quantitative or categorical variable neithe
ludmilkaskok [199]

Answer: Temperature is an example of a quantitative variable

Explanation:

A quantitative variable is defined as :

  • A variable that can assume a numerical value .
  • It can be ordered with respect to either magnitude or dimensions.
  • It is further classified into two types : interval scale and ratio scale.

Temperature comes under interval scale , because interval scale has no zero point.

For example : A 0° C Celsius does not interpret that there is no temperature.

Therefore , Temperature is an example of a quantitative variable.

Hence, the correct answer is "quantitative variable"

5 0
3 years ago
Chemical formula 3CuCl2 + 2Al --> 2AlCl3 + 3Cu
MrRissso [65]

Answer:

nnkkkkhjkkhuokjhllkllllllll

3 0
3 years ago
Which natural polymer makes up paper? A. starch B. nylon C. wool D. rubber
eduard

Answer:

starch

Explanation:

7 0
3 years ago
1. Which trait is most likely to be passed on to its organism’s offspring?
mart [117]

Answer:Evolution

Evolution is the process by which populations of organisms change over generations. … If a trait is advantageous and helps the individual survive and reproduce, the genetic variation is more likely to be passed to the next generation (a process known as natural selection).

4 0
2 years ago
If C and Cl combined to make a compound, would it be covalent or ionic?
arsen [322]

Answer:

it would be a covalent bond

Explanation:

carbon has 4 valence electrons, while chlorine has 7.

6 0
2 years ago
Other questions:
  • For the chemical equation SO 2 ( g ) + NO 2 ( g ) − ⇀ ↽ − SO 3 ( g ) + NO ( g ) SO2(g)+NO2(g)↽−−⇀SO3(g)+NO(g) the equilibrium co
    12·1 answer
  • The job the part does within organism is the
    11·1 answer
  • Natural gas is a A. type of solar energy. B. type of electricity. C. nonrenewable resource. D. renewable resource.
    12·1 answer
  • A kilometer is much greater in distance then a millimeter true or false
    13·2 answers
  • Which of the following has highest first ionization potential among Ne,Mg,Cl and Na​
    8·1 answer
  • A certain metal M forms a soluble sulfate salt M2SO4. Suppose the left half cell of a galvanic cell apparatus is filled with a 5
    13·1 answer
  • Select from the drop-down menu to correctly complete the statement.
    15·1 answer
  • HELP MEE
    13·2 answers
  • Clinical thermomerter​
    9·2 answers
  • Look at the reaction below. upper h subscript 2 upper s upper o subscript 4 (a q) plus upper c a (upper o upper h) subscript 2 (
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!