A 0.1401 g sample of pure carbonate was dissolved in 50.00 mL of 0.1140 M HCl and boiled to eliminate CO2. Back-titration of the excess HCl required 24.21 ml of 0.09802 M NaOH. Identify the carbonate, i. e. X in X(CO3)n.

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.

c8h10 is your answerr

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.