What value is the closest to the atomic mass of cerium?

isotope percent abundance
136ce 0.185%
138ce 0.251%
140ce 88.450%
142ce 11.114%

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.

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?

Awoman's basketball has a circumference between 28.5 and 29.0 inches and a maximum weight of 20 ounces (two significant figures). what are these specifications in units of centimeters and grams?