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3 years ago

Pentanitrogen heptachloride formula

Chemistry

1 answer:

Marianna [84]3 years ago

4 0

Answer:

Explanation:

this is the answer hope it helps!(:

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What is the relationship between grams and cm³?

soldier1979 [14.2K]

Answer:

1 gram

Explanation:

1 gram= weight of 1 cubic centimeter of pure water at temperature 4°C = 1000 milligrams = 0.001 kilogram

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3 years ago

PLEASE HELP!! this is on USAtestprep a) b) c) d)

kaheart [24]

The answer is D!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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2 years ago

Please help 19.0 kg/0.021 m^3

irina1246 [14]

Answer:

904.8 kg / m3

Explanation:

19.0 kg/0.021 m^3 = 904.761905 kg / m3

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2 years ago

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

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3 years ago

Scientists think the moon was formed when

lubasha [3.4K]

Answer:

A meteor hit earth they think the moon is created from debris from earth but really God created it UwU

Explanation:

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3 years ago