Question

masa molar del tetraborato de sodio Na2B4O7

Answer 1

Na: 2 x 22.9 = 45.8 g/mol
B: 4 x 10.81 = 43.24 g/mol
O: 7 x 16 = 112 g /mol
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Mm Na2B4O7 = 201.08 g/mol