How would you determine what compound has the highest percent by mass of hydrogen?

For example of these compounds:
#HCl#
#H_2O#
#H_2SO_4#
#H_2S#
#HF#

Answer 1

Of the compounds listed in the question, water has the highest percent mass of hydrogen.

I have rounded the masses to whole numbers in the calculations below. The numerators are the mass of hydrogen in the compound in grams, and the denominators are the molar masses of the compounds in grams. Divide the mass of hydrogen in each compound by the molar mass of the compound and multiply by 100.

#"mass percent H"="mass H"/"mass compound"xx100#

#"HCl:"# #1/36xx100="2.8%##"H"#

#"H"_2"O":# #2/18xx100="11.1%##"H"#

#"H"_2"SO"_4":##2/98xx100=2.0%##"H"#

#"H"_2"S":##2/34xx100=5.9%##"H"#

#"HF":##2/21xx100=9.5%##"H"#

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Answer 2

Wyatt Atkins

The compound with the highest percent by mass of hydrogen would have the highest proportion of hydrogen atoms relative to its total mass; to find this compound, you would calculate the percent composition of hydrogen in each compound and compare them.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

How would you determine what compound has the highest percent by mass of hydrogen?

For example of these compounds: #HCl# #H_2O# #H_2SO_4# #H_2S# #HF#

For example of these compounds:
#HCl#
#H_2O#
#H_2SO_4#
#H_2S#
#HF#