An insulated rigid tank initially contains 1.4 kg of saturated liquid water at 200 oc and air. at this state, 25% of tank volume is occupied by water and the rest is air. heat is, then, added by an electric resistor until saturated vapor is observed after 20 min. determine, a) total tank volume b) final temperature c) the power rating of the resistor

why do the isotopes of a particular element behave differently in nuclear reactions but the same in chemical reactions? chemical reactions involve changes to electrons in an atom; isotopes do not differ in electrons, and so they react the same way during chemical changes.

he uptake of drugs from the intestine is often strongly influenced by diffusion. for example, consider a water-insoluble steroid for treating inflammation that is solubilized in aggregates of detergent molecules, called micelles. these micelles, aggregates of 80 soap molecules, have a molecular weight of 24,000, a diameter of 2.6 nm, and a charge of -27. the positively charge ions (counterions) in this system are na".