The most valuable energy stock traded on the U.S. exchanges, ExxonMobil (NYSE: XOM), has a $392.2 billion market cap -- well ahead of second-place Chevron (NYSE: CVX) with its $268.3 billion market cap. There's a lot to like about both of these companies, but given the lead ExxonMobil has, I'm going to focus on why it deserves to be worth $500 billion today, and why it could reach a $1 trillion valuation within the next four years.

We'll also discuss the strength of ExxonMobil's dividend, which at current share prices yields 3.9%. Here's why the dividend stock is worth buying now.

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Source Fool.com