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Scrieti formulele chimice si calculati masele moleculare pt urmatoarele substante chimice:
acid sulfuric
carbonat de calciu
clorura de magneziu
oxid de sodiu
sulfat de calciu
hidroxid de aluminiu


Răspuns :

H2SO4
MH2SO4=2×AH+AS+4×AO=2×1+32+4×16=98g
CaCO3
MCaCO3=ACa+AC+3×AO=40+12+3×16=100g
MgCl2
MMgCl2=AMg+2×ACl=24+2×35,5=24+71=95g
Na2O
MNa2O=2×ANa+AO=2×23+16=62g
CaSO4
MCaSO4=ACa+AS+4×AO=40+32+64=calculeaza
Al(OH)3
MAl(OH)3=AAl+3×AO+3×AH=27+3×16+3×1=calculeaza