How many molecules are in .275 grams of SO₃?

Name: How many molecules are in .275 grams of SO 3 ?
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Question

Quizplus · Accepted Answer

Begin this problem by converting grams of SO₃ to moles of SO₃ using the molar mass of SO₃. Once you have obtained this value, use Avogadro's number to convert moles of SO3 to molecules of SO₃. The final expression is (.275 grams SO₃) x (1 mol / 80.057 grams) x (6.022x10²³molecules / 1 mol), indicating that the correct answer is 2.07x10²¹.

How Many Molecules Are in