Question

Alcatuieste formulele substanțelor după valenta indicata si calculeaza masele molare:HO,HS,NH,PH,HCl,SO,SO,CO,SiO,AlO,CaO,LiI

Answer 1

H(I) si O (II) => H2O   ==> MH2O = 2AH + AO =2*1+16=18g/mol

H(I) si O (II) => H2S ==> MH2S = 2AH + AS =2*1 + 32= 34g/mol

N(III) si H(I) => NH3 ==> MNH3 = AN+3AH=14+3*1=17g/mol

P(III) si H(I) => PH3 ==> MPH3 = AP+3AH=31+3*1=34g/mol

H(I) si Cl(I) => HCl ==> MHCl =AH + ACl = 1+35,5=36,5g/mol

S(IV) si O(II) => SO2 ==> MSO2 = AS+2AO = 32+2*16=64g/mol

S(IV) si O(II) => SO3 ==> MSO3 = AS+3AO = 32+3*16=80g/mol

C(IV) si O(II) => CO2 ==> MCO2 = AC+2AO=12+2*16=44g/mol

SIO2 ==> MSiO2 = ASi + 2AO = 28 + 32 = 60g/mol

Al(III) si O (II) => Al2O3 ==>MAl2O3=2AAl+3AO = 2*27+3*16=102g/mol

Ca(II) si O (II) => CaO ==> MCaO = ACa+AO=40+16=56g/mol

LiI ==> MLiI=ALi+AI=7+127=134g/mol