Question

It was determined through analysis that a compound sodium carbonate with a molar mass of 263g/mol contained 68.4% water . Determine the total number of water molecules in this hydrate

Answer 1

mass of water = total mass * percentage in sample=263g/mol*68.4%

find moles of water: \(\sf moles=\dfrac{mass}{Molar~mass}\)


Find molecules: \(\sf moles=\dfrac{molecules}{avogadro's ~number}\)