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3 years ago

What is the molarity of 4 mol of naoh dissolved in 2 l of water?

2 answers:

5 0

Molarity of a solution is defined as the number of moles of solute in 1 L of solution.
here we are given 4 mol of NaOH to be dissolved in 2 L of water
the number of moles of NaOH in 2 L of water - 4 mol
therefore number of NaOH moles in 1 L of water - 4/2 = 2 mol of NaOH
there are then 2 mol of NaOH in 1 L

therefore molarity of solution is 2 mol/L

kirill115 [55]3 years ago

5 0

Answer:

The answer is 2 MoI Apx answer

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a radioisotope has a half life of three hours how much of a 120g sample remains after 9 hours. what will the g amount be after 3

aksik [14]

$\huge\boxed{♔︎Answer♔︎}$

60g after 3 hours, 30g after 6 hours and 15g after 9 hours

Explanation:

Weight of the radioactive sample = 120g

half life time period = 3 hours

(a) The weight of sample after 3 hours

$\textsf{ No. of half lives} = \sf \cancel\frac{3}{3} = 1$

The fraction of sample left

$\sf { \frac{1}{2} }^{1} = \frac{1}{2}$

Mass of the sample left

$\sf \frac{1}{2} \times 120 = \cancel\frac{120}{2} = 60g$

60g of sample is left after 3 hours

(b) The weight of sample after 6 hours

$\textsf{ No. of half lives} = \sf \cancel\frac{6}{3} = 2$

The fraction of the sample left

$\sf { \frac{1}{2} }^{2} = \frac{1}{2} \times \frac{1}{2} = \frac{1}{4}$

Mass of the sample left

$\sf \frac{1}{4} \times 120 = \cancel\frac{120}{4} = 30g$

30g of sample is left after 6 hours

$\textsf {No. of half lives} = \sf \cancel\frac{9}{3} = 3$

The fraction of sample left

$\sf { \frac{1}{2} }^{3} = \frac{1}{2} \times \frac{1}{2} \times \frac{1}{2} = \frac{1}{8}$

Mass of sample left

$\sf \frac{1}{8} \times 120 = \cancel \frac{120}{8} = 15g$

15g of sample is left after 9 hours.

3 0

2 years ago

Imagine you are about to investigate what happens when sodium and potassium are mixed together. Before you begin your experiment

inessss [21]

Explanation:

Potassium and Sodium are both metals on the periodic table. Both elements are found on the s-block of the table. Therefore, it is not possible for both of them to combine to form a compound.

For a compound to form two elements must combine in a definite order to given single product.

The combination is facilitated by a loss, gain or sharing of electrons between two species. This leads to an attraction between the combining species.

Both Sodium and potassium would prefer to lose electrons and there is no reason for them to combine to form a compound.

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3 years ago

How do ecosystems respond to natural disasters such as fires and floods?

Dafna11 [192]

Answer:

How do ecosystems respond to natural disasters such as fires and floods :

Explanation:

They recover in stages, gradually returning to the original system. … She plans to create various physical and biological disturbances in the ecosystem to see how populations change over time.

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2 years ago

Gas particles are pumped into a rigid steel container at a constant temperature. Which statement describes the change in pressur

Masteriza [31]

Answer:

The pressure inside the container would increase with each additional pump.

Explanation:

From the general gas law of ideal gases:

PV = nRT,

where, P is the pressure of the gas.

V is the volume of the gas.

n is the no. of moles of the gas.

R is the general gas constant.

T is the temperature of the gas.

As clear from the gas law; the pressure of the gas is directly proportional to the no. of moles of the gas.

P α n.

As gas particles are pumped into a rigid steel container, the no. of moles of the gas will increase.

So, the pressure of the gas will increase.

Thus, the right choice is: The pressure inside the container would increase with each additional pump.

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3 years ago

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olganol [36]

Answer:

Ocean, lakes and rivers. Are all liquids.

Explanation:

Ocean, lakes and rivers. Are all liquids. Snow starts off as a liquid, evaporates into a gas and camoes back as snow.

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3 years ago