How many grams of solute are needed to make 250 mL of a 2.055 M NaCl solution?
30 grams
76.7 grams
300.081 grams
58.44 grams

Answers

Answer 1

Answer:

30grams

Explanation:

To calculate the mass (number of grams of the solute) in the solution, we need to calculate the number of moles it contains first. We use the formula;

M = n÷ V

Where; M= Molarity or Molar concentration = 2.055M

n= number of moles= ?

V= Volume = 250mL

Volume in L is 250/1000 = 0.250L

n= M × V

n= 2.055 × 0.250

n= 0.51375moles

The mass is calculated using :

Mole (n) = mass (m) / molar mass (MM)

Molar mass of NaCl = 23 + 35.5

= 58.5g/mol

Mass = molar mass × mole

Mass = 58.5 × 0.51375

Mass = 30.0543

Therefore, the mass is 30grams


Related Questions

Why is it dangerous or bad for babies to be born too small or too early?

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It’s dangerous for babies to be born early because not all of the baby’s organs and bones may have not developed fully yet. Premature babies could also develop a bunch of different health problems such as asthma or feeding problems.

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Answers

Answer: Option B.

harvest photons and transfer light energy to the reaction-center chlorophyll

Explanation:

In the thylakoid membranes,the main role of the antenna pigment molecules is harvest photons and transfer light energy to the reaction-center chlorophyll because the photon of light move until it get to a molecule in the chlorophyll. When it reaches the molecule, it causes an excitation of electrons in the chlorophyll. The energy then present allow it to break free from the chlorophyll atom, which indicate chlorophyll donating an electron and the energy that is absorbed is then converted to heat.

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Answers

Answer:

Independent variable: THE TYPE OF MUSIC PLAYED

Dependent variable: MAGGIE'S TEARS

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Control group

Explanation:

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Independent variable is the variable that the experimenter manipulates or changes in order to bring about an outcome. The independent variable in this experiment is the THE TYPE OF MUSIC PLAYED by Bart because it is what is changed.

Dependent variable is the variable that is being measured. It responds to the changes made to the independent variable. In this experiment, the dependent variable is MAGGIE'S TEARS.

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Answers

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Answers

Answer:

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Explanation:

and

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oxygen

hydrogen, for the second question

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Answers

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Answer:

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Answers

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Answers

Answer:

c

Explanation:

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Answer:

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Explanation:

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Answers

Answer:

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Answer:

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Answers

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Answers

Answer:

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Answers

Answer:

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Explanation:

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https://brainly.com/question/1004235

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Answer:

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Answers

Answer:

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Answers

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