Yes you can:
HTML
<div class="nav">
<ul>
<li><a href="#">Presenting</a></li>
<li><a href="#">Services</a></li>
<li><a href="#">Telecoms</a></li>
<li><a href="#">Working With Us</a></li>
<li><a href="#">Contact Us</a></li>
</ul>
</div>
CSS
.nav{
display:table;
width:100%;
}
.nav ul{
display:table-row;
margin:0;
padding:0;
list-style:none;
}
.nav ul li{
display:table-cell;
}
.nav ul a{
padding:5px 14px;
display:block;
}
It will justify your li to the whole width of div. Try my example on your code