Given each of the following sets of values for an ideal gas, calculate the unknown quantity. a) P = 773 mm Hg; n = 0.240 mol; T = 25 C. What is the volume (in L)?

b) V = 635 mL; n = 0.0947 mol; T = 309 K. What is the pressure (in mm Hg)?

c) P = 727 mm Hg; V = 13.3 L; n = 0.393 mol. What is the temperature (in K)?

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

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.

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