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3 years ago

Please help! How do you calculate the "average percent yield"? I just need the formula.

Chemistry

1 answer:

mars1129 [50]3 years ago

6 0

Answer:

First make sure the both weights have the same units.

Take your experimental yield and divide it by the theoretical yield.

Multiply this value by 100 to find the percent yield.

Explanation:

For the Average. Add up the two percent yields that you found and divide by 2.

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Compare endothermic and exothermic reactions and give examples of each. In an endothermic reaction would we expect the temperatu

Ivanshal [37]

Exothermic gives off heat/energy and endothermic takes in heat/energy. Exothermic example: a candle flame

Endothermic example: baking bread

In Exothermic, you can expect the surrounding temp. to rise, and in Endothermic you can expect the surrounding temperature to fall.

Hope this helps

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3 years ago

Do anybody knows this I need help asap

Elza [17]

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3 years ago

a 50.00-mL sample of bleach solution contains 0.214 M HClO and 0.667 M NaClO. The Ka of hypochlorous acid is 3.0 ✕ 10−8. Find th

amm1812

Answer:

A) pH = 8.11

B) pH = 7.96

Explanation:

The pH of buffer is calculated using Henderson Hassalbalch's equatio, which is

$pH=pKa+log\frac{[salt]}{[acid]}$

pKa = -logKa = -log(3.0 ✕ 10⁻⁸)

pKa = 7.5

[salt] = 0.667

[Acid] = 0.214

$pH = 7.5 + log\frac{0.667}{0.214}=7.99$

A) If the solution is halved it means the concentration of both salt and acid will be the same.

The volume will change

Number of moles of acid = molarity X volume = 0.214 X 25 = 5.35 mmol

Number of moles of salt = molarity X volume = 0.667 X 25 = 16.68 mmol

moles of NaOH added = molarity X volume = 0.100 X 10 = 1 mmol

These moles of NaOH will react with acid to give same amount of salt and thus the moles of acid will decrease

New moles of acid = 5.35 - 1 = 4.35

New moles of salt = 16.68 + 1 = 17.68

the new pH will be

$pH = 7.5 + log\frac{17.68}{4.35}=8.11$

moles of HCl added = molarity X volume = 0.100 X 10 = 1 mmol

These moles of HCl will react with salt to give same amount of acid and thus the moles of salt will decrease

New moles of acid = 5.35 + 1 = 6.35

New moles of salt = 16.68 - 1 = 15.68

the new pH will be

$pH = 7.5 + log\frac{15.68}{5.35}=7.97$

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3 years ago

Answer each of the following questions with increases, decreases, or does not change.

Kaylis [27]

Answer:

1) Increases

2) decreases

3) increases

4) decreases

Explanation:

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Since the vapour pressure is proportional to temperature, as temperature increases, the vapour pressure increases alongside.

As intermolecular forces increases, the boiling point increases accordingly since more energy is required to break intermolecular bonds.

Lastly, the greater the surface area, tell greater the vapour pressure since more liquid surface area is now available.

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4 years ago

Among the following groups of atoms, which have the same outer energy level configurations?

luda_lava [24]

The answer is D. N, P, As, Bi.

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4 years ago

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