Question

pls tell me as fast as possible ​

Answer 1

(a). Na2SO4 atoms in Sodium is 23 and sulphur 32 and oxygen 16

(b). CaO calcium 40 and oxygen 16

(c). NaHCO3 Na 23 Hydrogen 1 carbon 12 oxygen 16

(d). NH3 nitrogen 14 hydrogen 1

(e). (NH4)2Cr2O7 chromium cr 52 others you know