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=27/108
=1/4
0,05m³=50L
M=n/V
=1/4 /50
=1/200
=5. 10^-³(B)
m N2O5 = 27 gram
Volume gas N2O5 = 0,05 m³ = 50 L
n = mol
Ditanya : Molaritas gas N2O5 ?
Jawab :
Ingat ! , dalam mencari Molaritas zat kita harus punya dua komponen penting yaitu mol dan Volume.
Langkah penyelesaian :
• Mencari mol N2O5.
Mr N2O5 :
= 2.Ar N + 5.Ar O
= 2.14 + 5.16
= 108 gram/mol
n N2O5 :
= m / Mr
= 27 gram / 108 gram/mol
= 0,25 mol
• Molaritas N2O5 :
= n / V
= 0,25 mol / 50 L
= 5 . 10-³ mol/L
= 5 . 10-³ M
Jawaban : ( b )