Washing soda, a compound used to prepare hard water for washing laundry, is a hydrate, w...

Washing soda, a compound used to prepare hard water for washing laundry, is a hydrate, which means that a certain number of water molecules are included in the solid structure. Its formula can be written as , where x is the number of moles of H₂O per mole of Na₂CO₃.When a 2.558-g sample of washing soda is heated at 25 °C, all the water of hydration is lost, leaving 0.948 g of Na₂CO₃.What is the value of x?