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b.
mol MnO₂ = gr/Mr = 72,5/87 = 0,83 mol
mol HCl = gr/Mr = 58,6 / 36,5 = 1,61 mol
Pereaksi pembatasnya adalah HCl
c. massa MnCl₂
massa = mol x Mr
= 0,4 x 126 = 50,4 gram
d. Volume Cl₂
T = 27°C = 300 K
P = 1 atm
e.