What is the percent loss in weight on heating Na2CO3.10H2O?

When heating sodium carbonate decahydrate (Na2CO3·10H2O), it loses water molecules as it converts to anhydrous sodium carbonate (Na2CO3). The molecular weight of Na2CO3·10H2O is approximately 286 g/mol, while that of anhydrous Na2CO3 is about 106 g/mol. The weight lost due to the water is around 180 g/mol (from 10 moles of water), leading to a percent loss in weight of approximately 62.9%.