<span><span><span>3C2H</span><span><span>2 </span><span><span><span><span /><span /></span></span></span><span> </span></span><span>C6H6</span></span></span>
<span><span>X--------------62,4г</span></span>
<span /><span><span>3х26---------78</span></span>
<span><span>Х<span>=62,4</span>г</span></span>
<span /><span><span><span>62,4г----------100</span>%</span></span>
<span /><span><span><span>х-----------------80% х</span><span>=49.92</span>г</span>
</span>