(Reuters) -Chevron said on Thursday it was expecting a loss of $200 million to$400 million in the third quarter due to the impact related to the acquisition of Hess. Chevron closed its $55 billion buyout of Hess in July after winning a landmark legal battle against larger rival Exxon Mobil to gain access to the largest oil discovery in decades. Excluding severance charges and other costs related to the$55 billion transaction, the U.S. energy major expects an impact of $50 million to$150 million on adj ...