Question

calculati masele moleculare pentru urmatoarele substante; KNO3, Na2 SO4, Ca(OH)2, H2CO3, Mg(OH)2, AL CL3, Ca(PO4)2



VAROG EU E URGENT!

Answer 1

KNO3       M=39+14+3.16=101------>1mol=101 g

Na2SO4      M=2.23 +32+4.16=142------->1mol=142g

Ca(OH)2     M=40+2.16 +2=74  -------->1mol=74g

H2CO3        M=2+12+3.16=62-------->1mol=62g

Mg(OH)2      M=24+2.16+2=58 ----->1mol=58g

AlCl3            M=27 +3.35,5=133,5----->1mol=133,5g

Ca3( PO4)2    M=3.40 +2.31+8.16=310------>1mol=310g

Answer 2

Mr(KNO3)=39+14+16*3=101 g/mol

Mr(Na2SO4)=23*2+32+16*4=142 g/mol

Mr(Ca(OH)2)=40+16*2+1*2= 74g/mol

Mr(H2CO3)=1*2+12+16*3=62 g/mol

Mr(MgOH)2=24+16*2+1*2=58 g/mol

Mr(AlCl3)=27+35,5*3=133,5 g/mol

Mr(Ca3(PO4)2)=40*3+31*2+16*8=310 g/mol