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ycow [4]
2 years ago
8

key A 0.150 M sodium chloride solution is referred to as a physiological saline solution because it has the same concentration o

f salts as normal human blood. Calculate the mass of solute needed to prepare 275.0 mL of a physiological saline solution.
Chemistry
2 answers:
lorasvet [3.4K]2 years ago
5 0

Answer:

2.41065 grams

Explanation:

Here we have to apply molarity, particularly in reference to the equation molarity = moles of solute / volume. I would like to rewrite this formula, but with respect to the units - grams = moles / Liters,

We can use molarity to determine the number of moles. After doing so, we can determine the mass of the solute with respect to the formula moles = mass / molar mass. The molar mass of NaCl is 58.44 grams.

_______________________________________________________

275 mL = 0.275 L,

Number of Moles of NaCl = 0.150 * 0.275 = 0.04125 moles,

Mass = 0.04125 * 58.44 = 2.41065 grams,

Solution - Mass of NaCl = 2.41065 grams

<u><em>Hope that helps!</em></u>

Nadya [2.5K]2 years ago
3 0

Answer:

2.41g

Explanation:

Data obtained from the question include the following:

Molarity of NaCl = 0.150M

Volume = 275mL

Mass of NaCl =..?

Next, we shall determine the number of mole of NaCl in the solution. This is illustrated below:

Molarity of a solution is simply defined as the mole of solute per unit litre of the solution. Mathematically, the molarity is expressed as:

Molarity = mole /Volume

Molarity = 0.150M

Volume = 275mL = 275/1000 = 0.275L

Mole =..?

Molarity = mole /Volume

0.150 = mole /0.275

Cross multiply

Mole = 0.15 x 0.275

Mole = 0.04125 mole

Therefore, the number of mole of solute, NaCl in the solution is 0.04125 mole.

Finally, we shall convert 0.04125 mole of NaCl to farms. This is illustrated below:

Molar mass of NaCl =23 + 35.5 = 58.5g/mol

Mole of NaCl = 0.04125 mole

Mass of NaCl =..?

Mole = mass/molar mass

0.04125 = Mass /58.5

Cross multiply

Mass = 0.04125 x 58.5

Mass = 2.41g

Therefore, the mass of the solute, NaCl needed to prepare the solution is 2.41g

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What is the molarity (M) of the following solutions?
Dennis_Churaev [7]

Answer:

The molarity (M) of the following solutions are :

A. M = 0.88 M

B. M = 0.76 M

Explanation:

A. Molarity (M) of 19.2 g of Al(OH)3 dissolved in water to make 280 mL of solution.

Molar mass of Al(OH)3 = Mass of Al + 3(mass of O + mass of H)

                                      = 27 + 3(16 + 1)

                                      = 27 + 3(17) = 27 + 51

                                      = 78 g/mole

Al(OH)_3 = 78 g/mole

Given mass= 19.2 g/mole

Mole = \frac{Given\ mass}{Molar\ mass}

Mole = \frac{19.2}{78}

Moles = 0.246

Molarity = \frac{Moles\ of\ solute}{Volume\ of\ solution(L)}

Volume = 280 mL = 0.280 L

Molarity = \frac{0.246}{0.280)}

Molarity  = 0.879 M

Molarity  = 0.88 M

B .The molarity (M) of a 2.6 L solution made with 235.9 g of KBr​

Molar mass of KBr = 119 g/mole

Given mass = 235.9 g

Mole = \frac{235.9}{119}

Moles = 1.98

Volume = 2.6 L

Molarity = \frac{Moles\ of\ solute}{Volume\ of\ solution(L)}

Molarity = \frac{1.98}{2.6)}

Molarity = 0.762 M

Molarity = 0.76 M

4 0
2 years ago
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Firdavs [7]

Answer:

thermometer, calorimeter

Explanation:

6 0
2 years ago
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noname [10]

Answer:

The correct choice is E (47 neutrons, 35 protons, 36 electrons)

Explanation:

A ion of net charge -1 means that the ion wins an e-.

We dismiss options B and C.

We also dismiss option A because neutrons + protons = 81.

neutrons + protons = mass number

So we have E and C.

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5 0
3 years ago
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SpyIntel [72]

Answer:

The correct answer is the option c)He thought the mold had released a chemical that prevented the bacteria’s growth.

Explanation:

In the 1920s, Alexander Fleming was working in his laboratory at St. Mary's Hospital in London when, almost by accident, he discovered a naturally growing substance that could attack certain bacteria. In one of his experiments, Fleming observed that colonies of a bacterium had been depleted or removed by a mold that grew on the same Petri dish. He observed that the bacteria furthest from the fungus had grown to produce large-sized colonies, while the colonies closest to the fungus were tiny. He determined that mold made a substance that could dissolve bacteria. The fungus was penicilium chrysogenum and thus Fleming called this substance penicillin, by the name of the mold that produces it. Thus, after several years of experiments in 1930, Howard Florey and Ernest Chain developed at Oxford University the procedures to produce pure penicillin from the fungus that Fleming isolated. Thus penicillin could be concentrated by Florey and Chain, and in 1945 they shared with Fleming the Nobel Prize in Medicine.

Then, <u><em>the correct answer is the option c)He thought the mold had released a chemical that prevented the bacteria’s growth.</em></u>

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2 years ago
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