Какие реакции являются экзотермическими?
1) 2C2H2+5O2---2CO2+2H2O+1400 КДж
2)N2+3H2-92КДж---2NH3
3) H2+I2---2NI-52КДж
4) H2O+C+132 КДж---CO+H2
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