A 125 μm film of rubber having an area of 0.6 m2 separates air from pure O2, with both gases at 1 atm and 298K. If oxygen has a diffusion coefficient in rubber of 0.21 × 10-9 m2 /s, calculate the mass flowrate (mg/min) of oxygen through the surface. Plot the concentration profile as a function of z. (cA vs. z, where A = O2).

In an exothermic reaction the bonding energy of the product is: less than the reactants same as the reactants greater than the reactants dependent upon the presence of a catalyst

Water is initially present in a state where its molecules are far apart. during a change of state, its molecules slow down. which change of state has most likely taken place? from a gas to a liquid from a liquid to a gas from a solid to a liquid from a gas to a plasma

How does a catalyst increase the speed of a reaction? a. the catalyst eliminates the activated complex stage, allowing products to form immediately. b. the catalyst lowers the energy level of the reactants, making it easier for them to react. c. the catalyst makes it easier for the activated complex to form, lowering the activation energy. d. the catalyst raises the energy level of the products, making the reaction finish sooner. reset next