The reaction is second order in and has a rate constant of 0.0197 at 25.0 . A reaction vessel initially contains 250.0 of 0.118 which is allowed to react to form the gaseous product. The product is collected over water at 25.0 . How much time is required to produce 146.0 of the products at a barometric pressure of 753.7 . (The vapor pressure of water at this temperature is 23.8 .