I WILL NAME YOU BRAINLIEST

Another student uses Graham’s Law to identify an unknown gas. The student measured the distance that Cl2(g) traveled to be 5.0cm and the unknown gas measured to 29.8cm. Calculate the molar mass of the unknown gas. The molar mass matches which of the unknown gases: H2, O2, N2, or F2?

answersilicon (si); oxygen (o);

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.