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M(Ca(NO3)2=160г/моль
M(Ca)=40г/моль
w=mве-ва/m(ра-ра)
w(Ca)=40/160*100=25%
M(N)14г/моль
w(N)=14*2/160=17%
w(O)=16*6/160*100=58%
Ответ:w(Ca)=25%
w(N)=17%
w(O2)=58%
CH3-C≡ C-CH3+2HCL-->CH3-CH(CL)-CH(CL)-CH3
CH3-C≡ C-CH3+Br2-->CH3-CBr=CBr-CH3
CH3-C≡ C-CH3+H2-->CH3-CH=CH-CH3
2CH3-C≡ C-CH3+11O2-->8CO2+6H2O
6NaOH+3Cl2=5NaCl+NaClO3+3H2O
ZnO+KOH=K2ZnO2+H2O
Ba(oh)2 щелоч.. al2oh3 амфоте..cu(oh)2 щелоч..koh щел.. cr2(oh)3 амф ..ni(oh)2 щели