Question

Calculati: Raportul atomic, de masa şi compozitie procentuala pt urmatoarea substanta chimica
Ca SO4 ETC
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Answer 1

CaSO4

r.a.=1Ca:1S:4O=1:1:4

r.m.=ACa:AS:4AO=40:32:4.16=40:32:64=5:4:8              ( s-a simplif. cu 8)

Comp.proc. prin masa moleculara

M=40+32+64=136

136g CaSO4---------40 g Ca---------32 g S--------64g O
100 g------------------x---------------------y----------------z

x=100.40:136=29,41 la suta Ca
y=100.32:136=23,52 la suta S
z=100.64:136=47,05 la suta O




gNa                                       MNa2CO3=2.23+12+3.16=106
gC
gO                                         106 g Na2CO3--------46 g Na------12g C---48gO
318 g Na2CO3                        318g ----------------------x-----------y----------z

                                                 x=318.46:106=138 g Na
                                                 y=318.12:106=36 g C
                                                  Z=318.48:106=144 g O