An isotope has 2 naturally occurring isotopes . X-107 has an abundance of 51.82% and a mass of 106.9 amu. X-109 has a relative abundance of 48.18% and a mass of 108.9 amu. Calculate the atomic mass. Identify the unknown element . Show work

How have the greenhouse gasses increased from the year 2000 to 2018

Acontrol during an experiment. might change remains constant does not exist does change

Phosphoric acid is a triprotic acid ( =6.9×10−3 , =6.2×10−8 , and =4.8×10−13 ). to find the ph of a buffer composed of h2po−4(aq) and hpo2−4(aq) , which p value should be used in the henderson–hasselbalch equation? p k a1 = 2.16 p k a2 = 7.21 p k a3 = 12.32 calculate the ph of a buffer solution obtained by dissolving 18.0 18.0 g of kh2po4(s) kh 2 po 4 ( s ) and 33.0 33.0 g of na2hpo4(s) na 2 hpo 4 ( s ) in water and then diluting to 1.00 l.