3.) A sample of argon goes from 500 K to 350 K and its pressure changes from 280 kPa to 380 kPa. If the
initial volume is 18 dms, what is the final volume?

4.) A sample of neon experiences a pressure drop from 75 kPa to 53 kPa. The temperature increases from
27°C to 93°C. If the initial volume is 12 L, what is the final volume?

5.) The volume of a sample of helium increases from 5 L to 25 L and its temperature drops from 2000 K to
1750 K. If the initial pressure is 1500 mm Hg, what is the final pressure?

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".

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answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.