Question

Test/tema la chimie pe nota am timp 5 zile sa trimite rezolvarea va rog.​

Answer 1

Răspuns:

Explicație:

a) NaOH

M NaOH = 40 g/mol

40 g NaOH................23 g Na..................16 g O.................1 g H

100..............................x.................................y...........................z

x = 23*100/40 = 57,5% Na

y = 16*100/40 = 40% O

z = 1*100/40 = 2,5% H

b) NaCl

M NaCl = 58,5 g/mol

58,5 g NaCl.....................23 g Na .....................35,5 g Cl

100.....................................x ...................................y

x = 100*23/58,5 = 39,3% Na

y = 100*35,5/58,5 = 60,7% Cl

c) Na2S

M Na2S = 78 g/mol

78 g Na2S.........................46 g Na.......................32 g S

100......................................x...................................y

x = 46*100/78 = 59% Na

y = 32*100/78 = 41% S