What are the final units when you have a mass (in grams), and then divide it by molar
mass

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.

The following reaction shows sodium carbonate reacting with calcium hydroxide. na2co3 + ca(oh)2 → naoh + caco3 how many grams of naoh are produced from 20.0 grams of na2co3? (molar mass of na = 22.989 g/mol, c = 12.01 g/mol, o = 15.999 g/mol, ca = 40.078 g/mol, h = 1.008 g/mol) 12.2 grams 15.1 grams 24.4 grams 30.2 grams

Why does his teacher ask him to balance the equation by including the correct coefficient