What is the mass of 6.78 × 10²⁴ molecules of SO₂? The molar mass of SO₂ is 64.06 g/mol.

Question

Quizplus · Accepted Answer

First, we need to calculate the total number of moles in 6.78 × 10^24 molecules of SO₂: n = N/Na n = (6.78 × 10^24)/6.022 × 10^23 mol^-1 n = 11.28 mol Next, we can use the molar mass of SO₂ to calculate the mass of 11.28 moles: m = n x M m = 11.28 mol x 64.06 g/mol m = 721 g Therefore, the correct choice is C.

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