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b. mol Al = Gram : Mr
= 5.4 : 27 = 0.2 mol
mol ditanya = koefisien ditanya : koefisien diketahui x mol diketahui
3 : 2 x 0.2 mol = 0.3 mol
c. gas nya itu gas apa ya? rumusnya itu mol = volume STP : 22.4, tinggal dimasukin aja angkanya;)