Cum aflu masa moleculara pentru:
Na2O - oxid de sodiu
AlCl3-clorura de aluminiu
Al2S3-sulfat de aluminiu
H2Co3-acid carbonic
H2So4 -acid sulfuric ( vitriol)
HNo3- acid azotic ( apa tare)
Ca(OH)2- hidroxid de calciu
CaO - oxid de calciu
NH3- amoniac
CH4- metan

2
Na2O
M Na2o=Ana+2Ao+22+2x16+22+32+54g+1 mol
AlCl3
M AlCl3+Aal+3Acl+26+3x35+26+105=131g=1 mol
Al2S3
M Al S3=2Aal+3As=2x26+3x32=52+96=148=1mol
H2Co3
M H2Co3=2Ah+3Aco=2x1+12+3x16=62=1mol
H2So4
M H2So4=1Ah+As+4Ao=2+32+4x16=2+32+64=98g=1mol
Hno3
MHno3=Ah+An+3Ao=14+3x16=15+48=63g=1mol
Nh3
MNh3=An+3Ah=14+3x1=17g=1mol
Ch4
MCh4=Ac+4Ah=12+4x1=16g=1mol

Răspunsuri

  • Utilizator Brainly
2014-03-31T18:40:58+03:00
Apoi dinsistem scrie in partea dreapta cred dar scrie mnasa atomica  si cand o afli scri:Mindice adica mai jos Na2O= cat scrie in tabel ca are sodiu + 2(pentru ca  ii 2 O) oxigenul stiu ca are 16 si cat obti aiai masa si asa la toate
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2014-03-31T18:51:54+03:00
Na2O-M=2x23+1x16=calculezi tu
AlCl3-M=1x27+3x36=calculezi tu
Al2S3-M=2x27+3x32=...
H2Co3-M=2x1+3x59=....
H2So4-M=2x1+4x..So nu gasesc :(
HNo3-M=1x1+3x..No nu gasesc :(
Ca(OH)2-M=1x40+2x16+2x1=...
CaO-1x40+1x16=...
NH3-M=1x14+3x1=...
CH4-M=1x12+4x1=...
Sper ca ti-am fost de ajutor,succes
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