A buffer solution is prepared by dissolving 0.100 moles of methylamine (CH3NH2) and 0.06 moles of methylammonium chloride (CH3NH3Cl) in 0.250
L of solution. Calculate the pH of this solution after 0.200 moles of HCl has
been added. Kb = 4.38 x 10-4 for methylamine.

Problem page gaseous ethane reacts with gaseous oxygen gas to produce gaseous carbon dioxide and gaseous water . if of water is produced from the reaction of of ethane and of oxygen gas, calculate the percent yield of water. be sure your answer has the correct number of significant digits in it.

Can someone me with these questions plz.

Match term definition ellipse a) diagonal cross section of a cylinder circle b) diagonal cross section through the widest part of a sphere sphere c) cross section parallel to the base of a cone great circle d) shape created when a semi-circle is rotated around the y-axis triangle e) perpendicular cross section of a cone