Question

Cat oxigen se afla in 10 grame de NaOH?

Answer 1

M NaOh=11+16+1=28 g/mol

m NaOH=10 g

10 gNaOH ....................................16 g O

28g..........................................x

x=16*28/10=44,8

Answer 2

in 40 g NaOH se gasesc 16 g O
in 10 g NaOH se gasesc x g O     x = 4 g O
masa molara NaOH = A sodiu + A oxigen + A hidrogen = 23+16+1=40 g/mol