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3 years ago

To calculate the molarity of a solution it is necessary to know the moles of solute and the

1 answer:

4 0

The molarity of a solution is the number of moles of a substance in one liter of the solution. To know the molarity of something, you must know the moles of solute and the volume of the solution.

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What volume (in mL) of a 0.113 M NaCl solution contains 0.087 mol NaCl?

Helen [10]

Hello I a m s o m o n e I n t h e w o r l d

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3 years ago

BigorU [14]

Answer:

3.34x10¹⁶ molecules of aspirin are in a drop of blood

Explanation:

The recomended dose of aspirin in blood is 100.0μg/mL =

1x10⁻⁴g aspirin / mL of blood.

In a drop (0.100mL) there are:

0.100mL ₓ (1x10⁻⁴g aspirin / mL of blood) = 1x10⁻⁵g aspirin.

Molecular mass of aspirin is:

9C = 12.01g/mol ₓ 9 = 108.09g/mol

8H = 1.01g/mol ₓ 8 = 8.08g/mol

4O = 16g/mol ₓ 4 = 64g/mol

108.09 + 8.08 + 64 = 180.17g/mol

Thus, moles of aspirin in 1x10⁻⁵g are:

1x10⁻⁵g ₓ (1mol / 180.17g) = 5.55x10⁻⁸ moles of aspirin

In 1 mole, you have 6.022x10²³ molecules, thus:

5.55x10⁻⁸ moles of aspirin ₓ (6.022x10²³ molecules / 1 mole ) =

<h3>3.34x10¹⁶ molecules of aspirin are in a drop of blood</h3>

7 0

3 years ago

In the following reaction, when the equation is correctly balanced, what is the correct coefficient for sodium chloride? Pb(NO3)

11Alexandr11 [23.1K]

Answer: Thus the correct coefficient for sodium chloride is 2.

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

The balanced chemical reaction is:

$Pb(NO_3)_2(aq)+2NaCl(aq)\rightarrow PbCl_2(s)+2NaNO_3(aq)$

Thus the correct coefficient for sodium chloride is 2.

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3 years ago

Identify the correct lewis structure for the following ionic compound. SrO

ryzh [129]

For the problem presented, the correct Lewis structure for SrO is <span>[Sr]^+2 + [O]^<span>-2. </span>I am hoping that this answer has satisfied your query about this specific question. Also, if you have further questions, please don’t hesitate to ask away.</span>

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4 years ago

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What do you notice when you get into a car that has been sitting in the sun for a while?

Alona [7]

Answer:

I notice that it's extremely hot after it has been sitting in thr sun for a while. The sun's rays have been directly shining on the car because the car was in the sun's Ray's directly. If the car's windows were to be left open, it would be less hot but still be hot if the rays of the sun were directly on the car.

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3 years ago