Half- fill a plastic cup with warm water Cover the cup with plastic wrap. Secure the plastic with a rubber band. Place an ice cube on the plastic wrap. Observe the cup for several minutes. Record your observation below

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Ответ:

ellamai16

10.06.2021

Chemistry

Answer : The correct option is, (A) 82.35% N; 17.65% H

Explanation :

Percent composition : It is calculated by dividing the mass of each element in one mole of the compound that means dividing the mass of each element by the total molar mass of the compound.

Formula used :

$\%\text{ Composition}=\frac{\text{Mass of each element}}{\text{Molar mass of compound}}\times 100$

The given molecule is, NH_3

Molar mass of H = 1 g/mole

Molar mass of N = 14 g/mole

First we have to calculate the molar mass of NH_3 .

Molar mass of glucose NH_3 = 1(14)+3(1)=17g/mole

Now we have to calculate the percent composition of nitrogen and hydrogen in NH_3 .

As we now that there are 1 number of nitrogen atom and 3 number of hydrogen atoms.

$\%\text{ Composition of nitrogen}=\frac{\text{Mass of nitrogen}}{\text{Molar mass of }NH_3}\times 100$

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

$\%\text{ Composition of nitrogen}=\frac{14}{17}\times 100=82.35\%$

and,

$\%\text{ Composition of hydrogen}=\frac{\text{Mass of hydrogen}}{\text{Molar mass of }NH_3}\times 100$

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

$\%\text{ Composition of hydrogen}=\frac{3\times 1}{17}\times 100=17.65\%$

Therefore, the percent composition of nitrogen and hydrogen in NH_3 is, 82.35 % and 17.65 % respectively.

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