Submitted by reuters8361 in business
Exxon Mobil <a href="https://www.reuters.com/markets/companies/XOM.N" target="_blank">(XOM.N)</a> is expected to say on Wednesday it will buy U.S. rival Pioneer Natural Resources <a href="https://www.reuters.com/markets/companies/PXD.N" target="_blank">(PXD.N…