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m Mg(OH)2= n x Mr Mg(OH)2
5,8 = n x 58
n = 0,1 mol ; maka n HCl = 2 x 0,1 = 0,2
m HCl = n x Mr HCl
m Hcl = 0,2 x 36,5
m HCl = 7,3 gram
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