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A certain borate has been analysed that contain: B=11.3%, Na=12.06%, after heating it with 100oC the...

A certain borate has been analysed that contain: B=11.3%, Na=12.06%, after heating it with 100oC the weight become 47.25%, thereby the chemical formula=

a) Na2B4O7・8H2O

b) Na2B4O7・9H2O

c) Na2B4O7・10H2O

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