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2 years ago

Which statement about hydrogen bonds is true?

Chemistry

2 answers:

daser333 [38]2 years ago

8 0

Explanation:

Hydrogen bond is a type of intermolecular chemical bond formed between two molecules. It is classified as a special dipole-dipole attraction between polar molecules in which a hydrogen atoms is directly joined to a highly electronegative atom.

A hydrogen nucleus has a high concentration of positive charges.
A hydrogen bond is actually an electrostatic attraction between the hydrogen atom (nucleus of one molecule and the electronegative atom, O or N or F) of a neighboring molecule.
The strength of the bond depends on the relative electronegativity of the atom directly joined to the hydrogen.
Hydrogen bonding forces is reflected in the physical properties of compounds such as water and ammonia.

3241004551 [841]2 years ago

4 0

Answer:

lol whatever they said. answers D, they help water striders walk on water by making surface tension

Explanation:

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faust18 [17]

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Explanation:

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

$\pi=iMRT$

Or,

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

where,

$\pi$ = osmotic pressure of the solution = 4.19 torr

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

Mass of solute (polypeptide) = 0.327 g

Volume of solution = 1.70 L

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

T = temperature of the solution = $26^oC=[273+26]K=299K$

Putting values in above equation, we get:

$4.19torr=1\times \frac{0.327}{\text{Molar mass of solute}\times 1.70}\times 62.364\text{ L.mmHg }mol^{-1}K^{-1}\times 299K\\\\\text{molar mass of solute}=856g/mol$

Hence, the molar mass of the polypeptide is 856 g/mol

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