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mol = massa/Mr
0,1 = massa/65
massa = 0,65 gram
2. 2Na + 2HCl --> 2NaCl + H2
0,2 mol 0,4 mol 0,2mol
a. Massa nya
massa= mol x Mr = 0,4 x 58,5 = 23,4 gr
b. mol = v/22,4
0,2 = V/22,4
V = 4,48 liter