Answer: 2.07x1021Begin 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 (6.022x1023 molecules / 1 mol), indicating that the correct answer is 2.07x1021.

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SAT Chemistry

Category - Multiple Choice

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How many molecules are in .275 grams of SO₃?

3.22x10²⁰
4.50x10²¹
2.07x10²¹
1.12x10²⁰
4.56x10²²

Explanation

Answer: 2.07x10²¹

Begin this problem by converting grams of SO₃to moles of SO₃using the molar mass of SO₃. Once you have obtained this value, use Avogadro’s number to convert moles of SO₃to molecules of SO₃. The final expression is (.275 grams SO₃) x (1 mol / 80.057 grams) x (6.022x10²³ molecules / 1 mol), indicating that the correct answer is 2.07x10²¹.

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