Beta blockers are drugs that are used to manage hypertension. It is important for doctors to know how rapidly a beta blocker is eliminated from the body. A certain beta blocker is eliminated in a first-order process with a rate constant of 7.6 * 10^–3 min^–1 at normal body temperature (37°C). A patient is given 20. mg of the drug. What mass of the drug remains in the body 5.0 h after administration?