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vampirchik [111]

3 years ago

6

How are the melting points and boiling points of molecular compounds usually different from those of ionic compounds

1 answer:

pentagon [3]3 years ago

6 0

Melting points and boiling points of molecular compound are usually lower than ionic compounds. This is so as only a small amount of energy is required to overcome the weak intermolecular forces of attraction (Van de Waals forces) thus having lower m.p. and b.p.

Ionic compounds require a large amount of energy to overcome the strong electrostatic forces of attraction between the ions, hence having higher mp and bp

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What is Kb for N2H4 if the pH of a 0.158M solution of N2H5Cl is 4.5?

olasank [31]

Answer:

Kb $= 1.58 * 10^{-6}$

Explanation:

The correct question is

What is Kb for N2H4 if the pH of a 0.158M solution of N2H5Cl is 4.5?

Solution-

N2H4Cl hydrolyses on addition of water

The reaction equation is as follows -

N2H4+ + H2O ----> N2H4 + H3O+

$Ka = \frac{K_w}{K_b} = \frac{10^{-14}}{K_b}$

pH $= 4.5$

$[H+] = 10^{-pH} = 10^{-4.5}$

$K_b= \frac{10^{-14} }{K_b} = \frac{Y_2}{0.158} \\K_b= \frac{(10^{-4.5})^2}{0.158}\\=> Kb = 0.158 * 10-14 /(10-4.5)2$

Kb $= 1.58 * 10^{-6}$

3 0

2 years ago

Eddi Din [679]

CHA is not an example of a molecule because there is no element represented by “A”

6 0

2 years ago

There are four hundred participants in the local Thanksgiving 5K race. If 51% of the participants are female, what is the ratio

Paha777 [63]

Answer:

51:49 is the ratio of female participants to male participants.

Explanation:

Percentage of females in the race = 51 %

Percentage of males in the race = 100% - 51 % = 49%

Total participants in race = 400

Number of women participants = $51% of 400=\frac{51}{100}\times 400=204$

Number of men participants = $49% of 400=\frac{49}{100}\times 400=196$

Ratio of female participants to male participants :

$\frac{204}{196}=\frac{51}{49}=51:49$

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sladkih [1.3K]

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Wewaii [24]

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2 years ago