PLS HELP ANSWER This question is long and i suck at chemistry Select all correct names for the compounds.

2 particles of ribidium nitrate react with 1 particle of beryllium fluoride to form 1 particles of beryllium natrate and 2 particles of ribidium fluoride.
2 (a-c) + 1 (d-f) --> 1 (g-i) + 2 (j-l)

a. RbNO3
b. RbNO2
c. RhNO3
d. BeF
e. BeF2
f. BeFl
g. BeNO3
h. Be(NO3)2
i. Be(NO2)2
j. RbF
k. Rb2F
l. RbFl

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.