Find the formula unit mass of the given ionic compounds:
1. Calculate the formula unit mass of sodium chloride \((NaCl)\).
Formula unit mass of sodium chloride \((NaCl)\) \(=\) \(u\)
2. Calculate the formula unit mass of sodium carbonate \((Na_{2}CO_{3})\).
Formula unit mass of sodium carbonate \((Na_{2}CO_{3})\) \(=\) \(u\)