I'd like to design a chapter heading similar to the one in the picture below. I like to put a line between the number and the chapter name and also align the the chapter name to the left. I'm using the document class book. Any ideas how to do it?

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By chapter name do you mean the word ‘chapter’ or the chapter title? The picture is aligned on the right. So?… –  Bernard Jul 17 '14 at 10:17

You can build your own chapterstyle with the titlesec package:

\documentclass{report}
\usepackage[explicit]{titlesec}
\usepackage{lipsum}
\usepackage{type1cm}
\usepackage{xcolor}

\titleformat{\chapter}[display]
{\normalfont\Large\rmfamily}
{\sffamily\flushright\fontsize{60}{0}\textbf{\textcolor{black!20}{{\Huge\chaptername}~\thechapter\vskip0pt\rule{\textwidth}{2pt}}}}{0pt}
{\flushleft\fontsize{30}{0}{#1}\vskip60pt}
\titlespacing*{\chapter}
{0pt}{-40pt}{0pt}

\begin{document}
\chapter{Enjoy the whitespace}

\lipsum[1]
\end{document}


The type1cm package is required for the font size.

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type1cm is required if you use computermodern. If you use another font that exists in type1 or opentype format, you don't need it. –  Bernard Jul 17 '14 at 10:54
Thanks a lot Bernard! Good one! Two questions: 1) Where in the codes I can play around with the spacing before after the line? 2) How can I add "CHAPTER" before one? With a smaller size ... –  LatexQuest Jul 17 '14 at 11:49
To change the spacing before the line you can simply change the value of \vskip0pt\rule... to any other value. If you want to change the space after you have to change the ...}}}{0pt} at the end of the line –  SLx64 Jul 17 '14 at 11:54
I have edited my answer for your second question. –  SLx64 Jul 17 '14 at 11:57
Thanks a lot! It's perfect! –  LatexQuest Jul 17 '14 at 12:14