Question

pls answer it fast it's very urgent

Answer 1

K2CO3= 2(K) + C + 3(O)
= 2(39) + 12 + 3(16)
= 78 + 12 + 48
= 138u

Answer 2

k=39

o=16

c=12

=39.2+12+16.3

=78+12+48

=138