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n×6,02×10^23 = 1,806×10^23
n = (1,806×10^23):(6,02×10^23)
n = 0,3 mol
n = m/Mr
0,3 = 9,1/Mr
Mr = 9,1/0,3
Mr = 30,33
Jawaban: B (paling mendekati)
mol = 1,806×10 pangkat 23/6,02×10 pangkat 23
mol = 0,3 mol
Mr unsur x = gram/mol
= 9,1/0,3
= 30,3 dibulatkan menjadi 30
jdi jwaban yang benar adalah pilihan B
smoga mmbantu ya