4) Calculate the percentage by
mass of oxygen in Pb(NO3)2
A) 193
B20
145

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

Calculate the mass of silver needed to react with chlorine to produce 126g if silver chloride?

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