2Na+2HNO3(конц.)=2NaNO3 + H2
₂₅₆Md
p = 101
n = 256 - 101 = 155
e = 101
<em>2KMnO4 = K2MnO4 + MnO2 + O2</em>
<em><span>2Hg + O2 = 2HgO</span></em>
<em><span>2HgO = 2Hg + O2</span></em>
<em>2Са+О2 = 2СaO</em>
<span>2NH</span>4<span>Cl+ Ca(OH)</span>2<span> = 2NH</span>3<span> +H</span>2<span>O; Mr(NH</span>4<span>Cl)=53,5 </span>
<span>20Х, 98% </span>
<span>NH</span>4<span>Cl +0,5Са(ОH)</span>2<span> = NH</span>3<span> +0,5H</span>2<span>O </span>
<span>53,522,4</span>