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CaO+2HNO3--> Ca(NO3)2+H2O
MHNO3=1g+14g+3*16g=63g/mol
MCa(NO3)2=40g+2*14g+6*16g=164g/mol
2*63g/mol HNO3-164g Ca(NO3)2
xg HNO3-300gCa(NO3)2
x=230,5g
Odp: Wzięto 230,5g kwasu azotowego V.