Twenty molecules of SO3 will weight as much as ____

Engineering

Chemistry

Mole and Its Calculation

Question

Twenty molecules of SO₃ will weight as much as _____ molecules of oxygen.

100

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The weight of one SO₃ molecule = 32 + (3 × 16)

= 32 + 48 = 80 u

Weight of twenty SO₃ molecule = 20 × 80 = 1600 u

Weight of each molecule of oxygen = 2 × 16 = 32 u

Therefore, the no. of oxygen molecules

= \frac{1600}{32} = 50

So, the correct option is B

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