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3 years ago

The number of electrons in the valence shell determine what types of bonds an atom can form.

Chemistry

1 answer:

Nataly_w [17]3 years ago

8 0

This statement is right !

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A solution made by dissolving 33 mg of insulin in 6.5 mL of water has an osmotic pressure of 15.5 mmHg at 25°C. Calculate the mo

Liula [17]

Answer: The molar mass of the insulin is 6087.2 g/mol

Explanation:

To calculate the concentration of solute, we use the equation for osmotic pressure, which is:

$\pi=iMRT$

Or,

$\pi=i\times \frac{\text{Mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution (in mL)}}\times RT$

where,

$\pi$ = osmotic pressure of the solution = 15.5 mmHg

i = Van't hoff factor = 1 (for non-electrolytes)

Mass of solute (insulin) = 33 mg = 0.033 g (Conversion factor: 1 g = 1000 mg)

Volume of solution = 6.5 mL

R = Gas constant = $62.364\text{ L.mmHg }mol^{-1}K^{-1}$

T = temperature of the solution = $25^oC=[273+25]=298K$

Putting values in above equation, we get:

$15.5mmHg=1\times \frac{0.033\times 1000}{\text{Molar mass of insulin}\times 6.5}\times 62.364\text{ L.mmHg }mol^{-1}K^{-1}\times 298K\\\\\text{molar mass of insulin}=\frac{1\times 0.033\times 1000\times 62.364\times 298}{15.5\times 6.5}=6087.2g/mol$

Hence, the molar mass of the insulin is 6087.2 g/mol

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3 years ago

Species developed harder shelled eggs to raise them on land, this is to adapt to the changes in the enviorment during the Cenozo

mario62 [17]

False would be the answer

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Read 2 more answers

Which of the following pairs of aqueous solutions will form a precipitate when mixed?

wolverine [178]

I think the correct answer from the choices listed above is option B. The reactants calcium sulfide and sodium sulfate will react and form a precipitate which is calcium sulfate since it is only slightly soluble in aqueous solution. Hope this answers the question.

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Which two elements are most abundant within the sun?

padilas [110]

Hydrogen and helium.

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3 years ago

Select the correct terms to complete the statement:

Likurg_2 [28]

Answer:

The particles that make up a substance in its liquid state have more kinetic energy than those of the same substance in its solid-state.

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3 years ago