1) Да [NaOH+HCl-->NaCl+H₂O]
2) Да [ 2NaOH+MgCl₂--->Mg(OH)₂↓+2NaCl]
3) Нет [NaCl+CuO≠]
4) Да [CaCO₃+2HCl--->CaCl₂+H₂O+CO₂]
5) Да [CuO+H₂SO₄--->CuSO₄+H₂O]
M(O2) = 32
M(CuO) = 64 + 16 = 80
<u>m(O2) </u>= (32 * 40)/(80 * 2) = <u>8 г</u>
CH₃-CH₂-CH₂-COOH + CH₃-CH₂-CH₂OH -->
CH₃-CH₂-CH₂-C-O-O- CH₂-CH₂-CH₃ + H₂O
Na2So3+ 2Hcl=2NaCl+So2(стрелка вниз)+H2O