Calculate the number of hydrogen atoms in 41.4 g of
ethyl alcohol, C2H60.

3.25 x 10²⁴ atoms of H

Explanation:

First you have to convert from grams to moles of C₂H₆O using the molar mass of C₂H₆O, which is 46.06 g/mol. Then convert from moles of C₂H₆O to moles of H using the ratio within the compound; for every molecule of C₂H₆O, there are 6 H atoms. Then lastly, because moles just represent a number in the same way a dozen does, we convert from moles of H to the number of atoms of H. 1 mole H = 6.022 x 10²³ atoms of H.

Round to lowest number of significant figure which is three to get 3.25 x 10²⁴.

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