The mass of 16.6 x 10²³ molecules of barium nitrate is 721 grams.
Moles of substance = no. of molecules ÷ 6.02 × 10²³
no. of moles = 16.6 x 10²³ ÷ 6.02 × 10²³
no. of moles = 2.76moles
Molar mass of Ba(NO3)2 = 261.34 g/mol
Mass of barium nitrate = 261.34 × 2.76
Mass of barium nitrate = 721g
Therefore, the mass of 16.6 x 10²³ molecules of barium nitrate is 721 grams.
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