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Novosadov [1.4K]

3 years ago

7

Which of the following is the weakest? A. hydrogen bond B. polar covalent bond C. dipole interaction D. ionic bond

2 answers:

aniked [119]3 years ago

6 0

the real answer is c, i just took the test

chubhunter [2.5K]3 years ago

3 0

The answer is A. Hydrogen bond

Molecules that have nonpolar covalent bonds donot form hydrogen bonds. Strenght. Hydrogen bonds are classified as weak bonds because they are easily and rapidly formed and broken under normal biological conditions.

Hope I helped :)

-Bucky

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What is the % dissociation of a solution of acetic acid if at equilibrium the solution has a pH = 4.74 and a pKa = 4.74?

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$\% diss = 50\%$

Explanation:

Hello there!

In this case, when considering weak acids which have an associated percent dissociation, we first need to set up the ionization reaction and the equilibrium expression:

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Now, by introducing x as the reaction extent which also represents the concentration of both H+ and A-, we have:

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2 years ago

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Answer : The correct option is, (D) 3600 kJ

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$\text{ Moles of octane}=\frac{\text{ Mass of octane}}{\text{ Molar mass of octane}}=\frac{75g}{114.23g/mole}=0.656moles$

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As, 1 mole of octane released heat = -5500 kJ

So, 0.656 mole of octane released heat = 0.656 × (-5500 kJ)

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Therefore, the heat released in the reaction is 3600 kJ

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