Question

va rog e urgentt!!dau coroana​

Answer 1

Răspuns:

a) NaOH

MNaOH=23+16+1=40g/mol

40gNaOH.............23gNa................16gO.................1gH

100gNaOH................x%gNa...............y%O..............z%H

x=100x23/40=calculeaza

y=100x16/40=calculeaza

z=100x1/40=calculeaza

b) NaCl

MNaCl=23+35,5=58,5g/mol

58,5g NaCl.................23gNa.................35,5gCl

100gNaCl....................x%Na.....................y%Cl

x=100x23/58,5=calculeaza

y=100x35,5/58,5=calculeaza

c) H2SO4

MH2SO4=2x1+32+4x16=98g/mol

98gH2SO4.............2gH.............32gS............64gO

100gH2SO4..............x%H...............y%S...............z%O

x=100x2/98=calculeaza

y=100x32/98=calculeaza

z=100x64/98=calculeaza

d) Ca(OH)2

MCa(OH)2=40+2x16+2x1=74g/mol

74gCa(OH)2...............40gCa................32gO..............2gH

100gCa(OH)2................x%Ca...................y%O................z%H

x=100x40/74=calculeaza

y=100x32/74=calculeaza

z=100x2/74=calculeaza

e) Ca3(PO4)2

MCa3(PO4)2=3x40+2x31+8x16=310g/mol

310gCa3(PO4)2............120gCa............62gP................128gO

100gCa3(PO4)2.................x%Ca.............y%P..............z%O

x=100x120/310=calculeaza

y=100x62/310=calculeaza

z=100x128/310=calculeaza

Explicație: