Question

Scrieți masa moleculară a 10 substanțe chimice.

Answer 1

mr(O)=AR(O)=16               MR(CR)=AR(CR)=52
MR(H)=AR(H)=1                  MR(MO)=AR(MO)=95
MR(CA)=AR(CA)=40              MR(FE)=AR(FE)=56
MR(LI)==AR(LI)=7\             MR(CO)=AR(CO)=59
MR(K)=AR(K)=39         MR(ZR)=AR(ZR)=91

Answer 2

M-masa moleculara
1)M(H2)=2*1=2 g/mol
2)M(O2)=2*16=32 g/mol
3)M(HCl)=1+35,5=36,5 g/mol
4)M(H2SO4)=2*1+32+4*16=98 g/mol
5)M(NaCl)=23+35,5=58,5 g/mol
6)M(NaOH)=23+16+1=40 g/mol
7)M(SiO2)=16*2+28=60 g/mol
8)M(CaO)=40+16=56g/mol
9)M(Ca(OH)2)=40+2*1+16*2=74g/mol
10)M(CaCO3)=40+48+12=100 g/mol