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Tincalconite, or borax pentahydrate, is a sodium-boron mineral with the general formula Na2B4O7·5H2O. it can be converted to anhydrous borax by dehydration to give

Na2B4O7

As for the second, gunpowder does not have a systematic name, as it's a mixture rather than a compound. The make up of gunpowder is a mix of charcoal (C), saltpetre (Potassium nitrate, KNO3) and sulfur (S). A formula can't be written for this as it implies that the substances bond to each other, which is not the case

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13y ago

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