Stare diffusion and reaction. solute a is diffusing at unsteady state into a semi-infinite medium of pure b and undergoes a first-order reaction with b. sol- ute a is dilute. calculate the concentration cat points z = 0.4, and 10 mm from the surface for 1 x 10's physical property data are d. 1 x 10 ml = 1 x 10 cx0 = 10 kg molím'. also calculate the kg mol absorbed/m.

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

When the chemicals iron sulfide (fes) and hydrochloric acid (hcl) are combined, bubbles appear from the mixture. 1. does the appearance of bubbles indicate a physical or chemical change? 2. why do the bubbles indicate this change? 3. what property is this?

Listenbase your answer to the question on the information below.nuclear radiation is harmful to living cells, particularly to fast-growing cells, such as cancer cells and blood cells. an external beam of the radiation emitted from a radioisotope can be directed on a small area of a person to destroy cancer cells within the body.cobalt-60 is an artificially produced radioisotope that emits gamma rays and beta particles. one hospital keeps a 100.0-gram sample of cobalt-60 in an appropriate, secure storage container for future cancer treatment.which choice represents the correct product for the beta decay of the co-60? fe-60ni-60fe-61ni-61