Question

How many molecules are in 98.3 grams of aluminum hydroxide

Answer 1

Explanation:

no of molecules =moles ×Na

no of moles = 98.3÷78

moles =1.26moles of alumium hydroxide

no of molecules = 1.26×Na

no ofmolecules =7.58×1023

Answer 2

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molar mass of aluminium hydroxide

=1×27+3×16+3×1

=27+48+3

=78g

hence,78g of al(oh)3 =one mole

than 98.3g of mole=98.3/78

=1.26 moles