4Zn + 9HNO3 = 4Zn(NO3)2 + NH3 + 3H2O
MCH3OOH=240*10/100=24 г
nCH3COOH=24/Mr(60)=0,4 моль
CH3OOH+NaOH=CH3COONa+H2O
nCH3COONa=nCH3COOH=0,4 моль
mCH3COONa=0,3*Mr(59+23=82)=32,8г. масса соли
А) C + K2Cr2O7 + H2SO4 -> CO2 + Cr2(SO4)3 + K2SO4 + H2O
<span><span>3 <span>C0</span></span> + <span>2 <span>K2Cr2VIO7</span></span> + <span>8 <span>H2SO4</span></span> → <span>3 <span>CIVO2</span></span> + <span>2 <span>Cr2III<span>(SO4)</span>3</span></span> + <span>2 <span>K2SO4</span></span> + <span>8 <span>H2<span>O
</span></span></span></span><span>C0</span> - <span>4e-</span> → <span>C<span>IV
</span></span><span>CrVI</span> + <span>3e-</span> → <span>Cr<span>III</span></span>