Question

What is the percent composition by mass of sulfur in the compound MgSO4 (gram-formula mass =120. grams per mole)?(1) 20.% (2) 27% (3) 46% (4) 53%

Answer 1

(2) 27%

Step-by-step explanation:

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Answer 2

Solving for the percent composition by mass of sulfur. The formula would be: %S = mass of sulfur / mass of compound x 100% Plugging in our data: %S = 32 amu / 120 amu x 100% %S = 0.266666 x 100% %S = 26.66% Rounded off to two significant numbers it will be 27%. Therefore the answer is number 2.