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Gala2k [10]
3 years ago
10

The number of moles of solute dissolved per liter of solution; also known as molar concentration.

Chemistry
1 answer:
jeka57 [31]3 years ago
4 0
This is the definition of Molarity.
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Chlorine can be prepared in the laboratory by the reaction of manganese dioxide with hydrochloric acid, HCl(aq)HCl(aq), as descr
ra1l [238]

Answer: 0.887 g of MnO_2 should be added to excess HCl(aq).

Explanation:

According to ideal gas equation:

PV=nRT

P = pressure of gas = 805 torr = 1.06 atm  (760torr=1atm)

V = Volume of gas = 235 ml = 0.235 L

n = number of moles = ?

R = gas constant =0.0821Latm/Kmol

T =temperature =25^0C=(25+273)K=298K

n=\frac{PV}{RT}

n=\frac{1.06atm\times 0.235L}{0.0820 L atm/K mol\times 298K}=0.0102moles

MnO_2(s)+4HCl(aq)\rightarrow MnCl_2(aq)+2H_2O(l)+Cl_2(g)

According to stoichiometry:

1 mole of chlorine is produced by = 1 mole of MnO_2

Thus 0.0102 moles of chlorine is produced by = \frac{1}{1}\times 0.0102=0.0102 moles of MnO_2

Mass of MnO_2 =moles\times {\text {Molar mass}}=0.0102mol\times 87g/mol=0.887g

0.887 g of MnO_2 should be added to excess HCl(aq).

7 0
3 years ago
Pleasee help me I really need an answer help
Juliette [100K]

Answer:

This is hard for me also but I am trying to find out answer

Explanation:

Please mark me as brainlist.

6 0
3 years ago
What is the final concentration if water is added to 0.25 L of a 8M NaOH solution to make 4.0 L of a diluted NaOH solution?
mojhsa [17]

Answer:

the answer is 0.5 naoh solution

6 0
3 years ago
Justin B. Believes that the temperature lowering during the fall months is what causes the color of the leaves to change. He set
Taya2010 [7]

Answer:

This question is incomplete, the remaining part of the question is:

What is the control group, independent variable and dependent variable?

Control group: Plants placed in 80 degree rooms

Independent variable: Change in temperature

Dependent variable: Change in color of leaves

Explanation:

The independent variable in a scientific experiment is the variable that the experimenter controls or manipulates in order to bring about a change in the dependent variable. In this experiment, the variable manipulated by Justin B is the TEMPERATURE CHANGE.

On the other hand, a variable is said to be dependent if it is the variable that responds to a change made to the independent variable or rather it is the outcome. In this experiment, Justin B is trying to see the outcome on the color change in leaves when exposed to a low temperature, hence, COLOR CHANGE IN LEAVES is the dependent variable.

Control group of an experiment is the group that receives no experimental treatment. It is the group the experimenter considers normal and hence is comparing with his experimental group. In this experiment, Justin B believes the leaves change color in a low temperature, hence, he placed some plants in a lower temperature (60 degree) in order to compare them with when the plants are placed in a higher temperature (80 degree). As far as this experiment is concerned, the plants placed in 80 degrees temperature are believed by Justin B not to undergo color change, hence, they are the CONTROL GROUP while the group he placed in 60 degrees temperature are what he is interested in, making them the EXPERIMENTAL GROUP

5 0
3 years ago
The method by which the substances in a mixture are separated is called what?
yanalaym [24]

Answer:

Filtration is a separation method used to separate out pure substances in mixtures comprised of particles some of which are large enough in size to be captured with a porous material.

8 0
3 years ago
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