[رهف الاحساس]

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(3) If 8.6 x 1023 molecules of calcium hydroxide are present, what will be its weight in gram ?
(a) 25.8 grams
(b) 74.2 grams
(c) 51.6 grams
(d) 105.9 grams*

(6) The number of atoms in the molecule Cr2(SO4)3 is
(a) 5
(b) 8
(c) 15
(d) 17*