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3 years ago

15

Which of the following statements about Ideal Gas Law is supported by Charles's Law?

2 answers:

Hitman42 [59]3 years ago

8 0

Which of the following statements about Ideal Gas Law is supported by Charles's Law?

B) If you decrease the temperature of a gas, its volume will decrease proportionally.

grin007 [14]3 years ago

5 0

Answer:

B

Explanation:

volume occupied by fixed amount of gas is directly proportional to its absolute temperature.

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Which of the following is NOT a combination reaction?

eimsori [14]

This answer should be B

5 0

3 years ago

Express the concentration of a 0.0350 M aqueous solution of fluoride, F − , in mass percentage and in parts per million (ppm). A

sveta [45]

Answer :

(a) The mass percentage is 0.0665 %

(b) The concentration in ppm is 665 ppm.

Explanation :

<u>Part (a) :</u>

As we are given that, 0.0350 M aqueous solution of fluoride ion that means 0.0350 moles of fluoride ion present in 1 L of solution.

First we have to calculate the mass of fluoride ion.

$\text{Mass of }F^-=\text{Moles of }F^-\times \text{Molar mass of }F^-$

Molar mass of $F^-$ = 19 g/mole

$\text{Mass of }F^-=0.0350mol\times 19g/mol=0.665g$

Now we have to calculate the mass of solution.

Mass of solution = Density of solution × Volume of solution

Density of solution = 1.00 g/mL

Volume of solution = 1 L = 1000 mL

Mass of solution = 1.00 g/mL × 1000 mL

Mass of solution = 1000 g

Now we have to calculate the mass -percentage.

$\text{Mass of percentage}=\frac{\text{Mass of }F^-}{\text{Mass of solution}}\times 100$

$\text{Mass of percentage}=\frac{0.665g}{1000g}\times 100=0.0665\%$

Thus, the mass percentage is 0.0665 %

<u>Part (b) :</u>

Parts per million (ppm) : It is defined as the mass of a solute present in one million $(10^6)$ parts by the mass of the solution.

Now we have to calculate the concentration in ppm.

$\text{Concentration in ppm}=\frac{\text{Mass of }F^-}{\text{Mass of solution}}\times 10^6$

$\text{Concentration in ppm}=\frac{0.665g}{1000g}\times 10^6=665ppm$

Thus, the concentration in ppm is 665 ppm.

7 0

4 years ago

Kc = 3.07 x 10-4 at 24°C for 2NOBr(g) ↔ 2NO(g) + Br2(g). If the initial concentration of NOBr = 0.878 M, what is the equilibrium

pav-90 [236]

Answer:

The equilibrium concentration of NO is 0.02124 M.

Explanation:

Given that,

Initial concentration of NOBr = 0.878 M

$k_{c}=3.07\times10^{-4}$

Temperature = 24°C

We know that,

The balance equation is

$2NOBr\Rightarrow 2NO+Br_{2}$

Initial concentration is,

$0.878\Rightarrow 0+0$

Concentration is,

$-2x\Rightarrow 2x+x$

Equilibrium concentration

$0.878-2x\Rightarrow 2x+x$

We need to calculate the value of x

Using formula of concentration

$k_{c}=\dfrac{[NO][Br_{2}]}{[NOBr]^2}$

Put the value into the formula

$3.07\times10^{-4}=\dfrac{[2x][x]}{[0.878-2x]^2}$

$2x^2=3.07\times10^{-4}\times(0.878)^2+3.07\times10^{-4}\times4x^2-2\times2x\times0.878\times3\times10^{-4}$

$2x^2=0.0002367+0.001228x^2-0.0010536x$

$2x^2-0.001228x^2+0.0010536x-0.0002367=0$

$1.998772x^2+0.0010536x-0.0002367=0$

$x=0, 0.01062$

We need to calculate the equilibrium concentration of NO

Using formula of concentration of NO

$concentration\ of\ NO=2x$

Put the value of x

$concentration\ of\ NO=2\times0.01062$

$concentration\ of\ NO=0.02124$

Hence, The equilibrium concentration of NO is 0.02124 M.

7 0

4 years ago

In order to promote the common ion effect, the concentration of the common ion must first:_____.

Svet_ta [14]

We need to increase the concentration of common ion first, in order to promote the common ion effect

<h3>What is the Common ion effect?</h3>

It is an effect that suppresses the dissociation of salt due to the addition of another salt having common ions.

For example, a saturated solution of silver chloride in equilibrium has Ag⁺ and Cl⁻ . Sodium Chloride is added to the solution and has a common ion Cl⁻. As a result, the equilibrium shifts to the left to form more silver chloride. Thus, solubility of AgCl decreases.

The Equilibrium law states that if a process is in equilibrium and is subjected to a change

in temperature,
pressure,
the concentration of reactant or product,

then the equilibrium shifts in a particular direction, according to the condition.

Thus, an increase in the concentration of common ion promotes the common ion effect.

Learn more about common ion effect:

brainly.com/question/23684003

#SPJ4

3 0

2 years ago

Define Acid and alkalis

kicyunya [14]

Answer:

Acids have a pH less than 7. Acids contain lots of hydrogen ions

Alkalis have a pH greater than 7. Alkalis contain lots of hydroxide ions

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<u><em>Please mark as brainliest if answer is right </em></u>

Have a great day, be safe and healthy

Thank u

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7 0

3 years ago

Read 2 more answers