Mr(SO₃) = 32 + 3 × 16 = 80
ω(O) = 48/80 × 100% = 0,6 × 100% = 60%
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Mr(SO₃) = 32 + 3 × 16 = 80
ω(O) = 48/80 × 100% = 0,6 × 100% = 60%