Question

How many molecules of SF6 are in
25.0 g SF6? (SF6, 146.07 g/mol)
[?]×10) molecules SF6

Answer 1

The number of molecules of SF₆ present in 25 g of SF₆ will be 1.03 x 10²³ .

Molar mass = 146.06 g/mol

Number of mole in 25 gm of SF₆ = 25 / 146.06 = 0.171

Now, number of molecules = 0.171 mole x 6.02 x 10²³ molecules

                                               = 1.03 x 10²³ molecules of SF₆

Hence, the number of molecules of SF₆ present in 25 g of SF₆ will be 1.03 x 10²³ .

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