Question

A hydrocarbon is a compound that contains mostly carbon and hydrogen. Calculate the percent composition (by mass) of the following hydrocarbon: c9h20.

Answer 1

The percentages of carbon and hydrogen 84.37%  and 15.693% respectively.

What is a molar mass ?

The mass of a certain chemical element or chemical compound (g) divided by the amount of material is known as the molar mass (mol). By multiplying the standard atomic masses (in g/mol) of the component atoms, one may get the molar mass of a compound.

Molar mass of the compound is the mass of 1 mole of compound which is the sum of masses of each element.

$C_9H_{20.$

Mass of 1 mole of compound= mass of carbon + mass of hydrogen+ = 9(12) + 20(1)= 128 g.

Percentage by mass of carbon = $\frac{mass \ of \ the \ carbon}{mass \ of \ the\ molecule }$%

= 108/128 * 100

= 84.37 %

Percentage by mass of carbon = $\frac{mass \ of \ the \ H}{mass \ of \ the\ molecule }$ %

=20/128 *100 =15.63 %

The percentages of carbon and hydrogen 84.37%  and 15.693% respectively.

To learn more about Molar mass  refer,

brainly.com/question/837939

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