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Chemistry

Sulfur trioxide reacts with water to form sulfuric acid according to the following reaction : SO3 + H2O -> H2SO4 Given the atomic mass of hydrogen is 1 amu, the atomic mass of oxygen is 16 amu, and one molecule of sulfuric acid has a mass of 98 amu, what is the atomic mass of sulfur trioxide?

-116amu
-80amu
-48amu
-32amu

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  1. All of the amu's must add to 98.
    2*H + S + 4*O = 98
    2*1 + S + 4*16 = 98
    2 + S + 64 = 98
    S = 98 - 64 - 2 = ?
    S = ?

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  2. Yeah 32 is not correct

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  3. No, 32 for S is correct. You need that to figure SO3. I assumed you could do the remainder. If S is 32 and O is 16 each then 32 + 3*16 = 32 + 48 = ?

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