Which describes an isotope of lodine? a. It can be divided into smaller particles that reta in all the properties of iodine.
b. It can have the same protons but different mass and neutrons.
c. It does not possess all the properties of a larger quantity of iodine.
d. It has an atomic number of 127

Estimate the molar mass of the gas that effuses at 1.6 times the effusion rate of carbon dioxide.

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.

How many moles are in 123.0 grams of kclo4?