what is the molarity of a concentrated hbr solution if the solution is 27.7% hbr by mass and has a density of 1.24 g/ml

Answers

Answer 1

Answer: Answer:
M = No.of moles of solute / Volume of solution in litres
HBr: H = 1 x 1 = 1 Br = 1 x 80
Molar mass : 81 g / mol
a. n = 27.7% / 100 =0.277 g / (81 g / mol) = 0.0034 mol

density = 1.24 g/ml ; D= m / v

b. 65.32 ml x 1 L / 1000 mL = 0.065 L


c. M= n / V
= 0.0034 mol / 0.065 L
M= 0.052 mol / L

The molarity of the concentrated HBr solution is 0.052 mol/L

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You have two bottles of water. One bottle is left outside in the sun for two hours. The other is left in an air-conditioned room for the same amount of time. What would you expect to observe after the two hours?The bottle left outside will have lower vapor pressure than the bottle from the room. The bottle left outside will have the same vapor pressure as the bottle inside the room because they both contain water. The bottle left outside will have higher vapor pressure than the bottle from the room. No change to either bottle.

Match the following definition to the type of solution it describes. unsaturated solution
saturated solution
supersaturated solution

A.
The amount of solute dissolved is less that the maximum amount the solution can hold.
B.
The amount of solute dissolved is the maximum amount the solution can hold.
C.
The amount of solute dissolved is more than the usual maximum amount.

Answers

unsaturated solution is The amount of solute dissolved is less that the maximum amount the solution can hold.

saturated solution is The amount of solute dissolved is the maximum amount the solution can hold.

supersaturated solution is The amount of solute dissolved is more than the usual maximum amount.

Which organic reaction produces rubber and plastics? A) polymerization B) esterification C) saponification D) fermentation

Answers

Answer: Option (A) is the correct answer.

Explanation:

When monomers in a chemical reaction combine together then it results in the formation of long chains. This process is known as polymerization.

For example, rubber and plastic are formed by polymerization.

Esterification is defined as a process in which esters are formed when an acid is heated with alcohol.

Saponification is defined as a process in which aqueous alkali is heated with a fat or oil resulting in the formation of a soap.

Fermentation is a process in which bacteria like microorganisms, yeast etc help in the breakdown of a substance into simpler substances.

Thus, we can conclude that polymerization is an organic reaction which produces rubber and plastics.

The answer would be, A) Polymerization.

Which of the following does not describe natural migration?
Pls I really need help

Answers

Answer:

I think its learned behavior

Explanation:

because animals don't learn how to migrate, they just know already.

Which catalyst is better for the decomposition of Hydrogen Peroxide(H₂O₂) , Potassium Iodide(KI) or Yeast? Explain why. Please help ASAP, very much appreciate it. Thankyou in advance.

Answers

Yeast, because it acts as a catalyst, or a helper, to remove the oxygen from the hydrogen peroxide

A gas syringe contains 56.05 milliliters of a gas at 315.1 K. Determine the volume that the gas will occupy if the temperature is increased to 380.5 K.

Answers

The new volume of the gas if the temperature is increased to the given value is 67.68 milliliters.

What is Charles's law?

Charles's law states that "the volume occupied by a definite quantity of gas is directly proportional to its absolute temperature.

It is expressed as;

V₁/T₁ = V₂/T₂

Given the data in the question;

Initial temperature of gas T₁ = 315.1K

Initial volume of gas V₁ = 56.05mL = 0.05605L

Final temperature T₂ = 380.5K

Final volume V₂ = ?

V₁/T₁ = V₂/T₂

V₂ = V₁T₂ / T₁

V₂ = ( 0.05605L × 380.5K ) / 315.1K

V₂ = 21.327025LK / 315.1K

V₂ = 0.06768L

V₂ = 67.68 mL

The new volume of the gas if the temperature is increased to the given value is 67.68 milliliters.

Learn more about Charles'slaw here: brainly.com/question/12835309

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Answer:

Given: V1 = 56.05mL T1= 315.1K T2= 380.5K

Unknown: V2=?

Formula: V2=V1T2/T1

Solution: V2= 56.05mL x 380.5K/315.1K

Answer: V2=67.68mL

Explanation:

Which isotope will spontaneously decay and emit particles with a charge of +2?(1) 53Fe (3) 198Au
(2) 137Cs (4) 220Fr

Answers

Answer: The correct option is 4.

Explanation: All the options will undergo some type of radioactive decay processes. There are 3 decay processes:

1) Alpha decay: It is a decay process in which alpha particle is released which has has a mass number of 4 and a charge of +2.

$_Z^A\textrm{X}\rightarrow _(Z-2)^(A-4)\textrm{Y}+_2^4\alpha$

2) Beta-minus decay: It is a decay in which a beta particle is released. The beta particle released has a mass number of 0 and a charge of (-1).

$_Z^A\textrm{X}\rightarrow _(Z+1)^A\textrm{Y}+_(-1)^0\beta$

3) Beta-plus decay: It is a decay process in which a positron is released. The positron released has a mass number of 0 and has a charge of +1.

$_Z^A\textrm{X}\rightarrow _(Z-1)^A\textrm{Y}+_(+1)^0\beta$

For the given options:

Option 1: This nuclei will undergo beta-plus decay process to form $_(25)^(53)\textrm{Mn}$

$_(26)^(53)\textrm{Fe}\rightarrow _(25)^(53)\textrm{Mn}+_(+1)^0\beta$

Option 2: This nuclei will undergo beta-minus decay process to form $_(80)^(198)\textrm{Hg}$

$_(79)^(198)\textrm{Au}\rightarrow _(80)^(198)\textrm{Hg}+_(-1)^0\beta$

Option 3: This nuclei will undergo a beta minus decay process to form $_(56)^(137)\textrm{Ba}$

$_(55)^(137)\textrm{Cs}\rightarrow _(56)^(137)\textrm{Ba}+_(-1)^0\beta$

Option 4: This nuclei will undergo an alpha decay process to form $_(85)^(216)\textrm{At}$

$_(87)^(220)\textrm{Fr}\rightarrow _(85)^(216)\textrm{At}+_2^4\alpha$

Hence, the correct option is 4.

It is 220Fr that would spontaneously decay and emit particles with a charge of +2.

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