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3 years ago

What is the relationship between boiling point and intermolecular forces

2 answers:

7 0

The higher the inter molecular forces, the higher the boiling points. All else being held constant, the stronger the inter molecular forces between atoms or molecules, the higher the boiling points.

jasenka [17]3 years ago

6 0

This is because stronger intermolecular bonds require more energy to break. As this energy is supplied in the form of heat when boiling, substances with stronger bonds will have a higher boiling point. The order of strength of intermolecular forces is; London dispersion forces < dipole-dipole < Hydrogen bonding

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A buffer solution contains 0.496 M hydrocyanic acid and 0.399 M sodium cyanide . If 0.0461 moles of sodium hydroxide are added t

pochemuha

Answer : The pH of the solution is, 9.63

Explanation : Given,

The dissociation constant for HCN = $pK_a=9.31$

First we have to calculate the moles of HCN and NaCN.

$\text{Moles of HCN}=\text{Concentration of HCN}\times \text{Volume of solution}=0.496M\times 0.225L=0.1116mole$

and,

$\text{Moles of NaCN}=\text{Concentration of NaCN}\times \text{Volume of solution}=0.399M\times 0.225L=0.08978mole$

The balanced chemical reaction is:

$HCN+NaOH\rightarrow NaCN+H_2O$

Initial moles 0.1116 0.0461 0.08978

At eqm. (0.1116-0.0461) 0 (0.08978+0.0461)

0.0655 0.1359

Now we have to calculate the pH of the solution.

Using Henderson Hesselbach equation :

$pH=pK_a+\log \frac{[Salt]}{[Acid]}$

Now put all the given values in this expression, we get:

$pH=9.31+\log (\frac{0.1359}{0.0655})$

$pH=9.63$

Therefore, the pH of the solution is, 9.63

4 0

4 years ago

Balancing equations AgCI+KCN-> Na3ALO3+H2

KATRIN_1 [288]

Answer:

Balanced chemical equation:

AgCl + 2KCN → K[Ag(CN)₂] (aq) + KCl (aq)

Balanced chemical equation:

2Al + 6NaOH →2 Na₃AlO₃ + 3H₂

Explanation:

Chemical equation:

AgCl + KCN → K[Ag(CN)₂] (aq) + KCl (aq)

Balanced chemical equation:

AgCl + 2KCN → K[Ag(CN)₂] (aq) + KCl (aq)

Net ionic equation can not be written because all are present in aqueous form and no precipitation occur.

Chemical equation:

Al + NaOH → Na₃AlO₃ + H₂

Balanced chemical equation:

2Al + 6NaOH →2 Na₃AlO₃ + 3H₂

This is oxidation reduction reaction.

Hydrogen is reduced in this reaction. while aluminium is oxidized.

7 0

4 years ago

Calculate the molecular mass of the element

marta [7]

Answer:

Na2SO4

2×23 + 32 + 4×16

46 + 32 +64

=142g

4 0

3 years ago

What is the resulting pressure when a sample of gas at 25°C in a 500 ml balloon

Natali5045456 [20]

Answer:

233.56 torr

Explanation:

We'll begin by converting celsius temperature to Kelvin temperature. This can be obtained as follow:

T(K) = T(°C) + 273

Initial temperature (T₁) = 25 °C

Initial temperature (T₁) = 25 °C + 273

Initial temperature (T₁) = 298 K

Final temperature (T₂) = 75 °C

Final temperature (T₂) = 75 °C + 273

Final temperature (T₂) = 348 K

Next, we shall convert 2 L to mL. This can be obtained as follow:

1 L = 1000 mL

Therefore,

2 L = 2 L × 1000 mL / 1 L

2 L = 2000 mL

Finally, we shall determine the resulting pressure. This can be obtained as follow:

Initial temperature (T₁) = 298 K

Initial volume (V₁) = 500 mL

Initial pressure (P₁) = 800 torr

Final temperature (T₂) = 348 K

Final volume (V₂) = 2000 mL

Final pressure (P₂) =?

P₁V₁/T₁ = P₂V₂/T₂

800 × 500 / 298 = P₂ × 2000 / 348

400000 / 298 = P₂ × 2000 / 348

Cross multiply

P₂ × 2000 × 298 = 400000 × 348

P₂ × 596000 = 139200000

Divide both side by 596000

P₂ = 139200000 / 596000

P₂ = 233.56 torr

Therefore, the resulting pressure is 233.56 torr

3 0

3 years ago

The movement of Earth's tectonic plates is related to A. seasonal changes in weather systems. B. cycles of sunspots. C. movement

Ksenya-84 [330]

c) the movement of the materials in the mantle

8 0

3 years ago