Question

What is the mass percent of hydrogen in hexanal?

Answer 1

Answer : The mass percentage of hydrogen in hexanal is, 12 %

Explanation: Given,

Molar mass of C = 12 g/mole

Molar mass of H = 1 g/mole

Molar mass of O = 16 g/mole

First we have to calculate the molar mass of hexanal.

Molar mass of hexanal $(C_{6}H_{12}O)$ = $6(12)+12(1)+(16)=100g/mole$

Now we have to calculate the mass of carbon.

As we now that there are 6 number of carbon atoms, 12 number of hydrogen atoms and 1 number of oxygen atoms.

The mass of hydrogen = $12\times 1=12g$

Now we have to calculate the mass percentage of hydrogen in hexanal.

Formula used :

$\%\text{ Mass percentage of hydrogen}=\frac{\text{Mass of hydrogen}}{\text{Mass of hexanal}}\times 100$

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

$\%\text{ Mass percentage of hydrogen}=\frac{12}{100}\times 100=12\%$

Therefore, the mass percentage of hydrogen in hexanal is, 12 %

Answer 2

The mass percentage of hydrogen in hexanal is 12 %

Calculation of mass percentage:

Since

Molar mass of C = 12 g/mole

Molar mass of H = 1 g/mole

Molar mass of O = 16 g/mole

Now Molar mass of hexanal should be

= 6(12) + 12(1) +  6

= 100 g/mole

Since there are 6 carbon atoms, 12 hydrogen atoms, and 1 number of oxygen atoms.

So, hydrogen mass should be = 12(1) = 12g

Now the mass percentage should be

$= 12\div 100$

= 12%

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