Alculate the percent by mass (percent composition) of hydrogen in methane (ch4). round your answer to the nearest whole number.

25

Explanation:

In one mole of methane there are 4 moles of hydrogen and one mole of carbon atom.

Mass of 1 mole of hydrogen atom = 1 g

Mass of 4 moles of hydrogen atom = 4 g

Mass of 1 mole of carbon atom = 12 g

Mass of 1 mole of methane = 12+4 = 16 g

Mass percent of hydrogen in methane =

25%

Explanation:

The total molecular mass of methane (CH4) = 12+4 =16

Hydrogen has a total mass of 4 out of the 16. Now to calculate the percentage of hydrogen there, we have (4/16) x 100 = 25

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