2 и 3 задание зеленое

2.a M(CO2)=12+32=44g/mol wC=12/44*100%=27.3% wO=100-27.3=72.7% b)M(CaS)=40+32=72g/mol wCa=40/72*100%=55.55% wS=100-55.55=44.45% v)M(NaNO3)=23+14+48=85g/mol wNa=23/85*100%=27% wN=14/85*100%=16.5% wO=100-27-16.5=56.5% g) M(Al2O3)=54+48=102g/mol wAl=54/102*100%=53% wO=100-53=47% 3. a) M(NH4Cl)=14+4+35.5=53.5g/mol wN=14/53.5*100%=26% b) M((NH4)2SO4)=28+8+32+64=132g/mol wN=28/132*100%=21% v) M((NH2)2CO)=28+4+12+16=60g/mol wN=28/60*100%=46.6% ответ: в-46.6%