Question

the number of molecules on 4,25 g of NH3 is approximately

Answer 1

Hi friend
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Your answer
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Molecular mass of NH3 = [14 + (3 × 1)] u = 17 u

So,
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Number of molecules in 17gm of NH3 = 6.022 × 10²³ molecules

Number of molecules in 4.25 gm of NH3 = (6.022 × 10²³ × 4.25)/17 = 1.5055 × 10²³ molecules

HOPE IT HELPS