31. Which of the following behaves as acid only? A. HCO3-
B. NH4+
C. HSO4-
D. CH3COO-

Chlorophyll a had the molecular formula c55h72mgn4o5 how many atoms are in this molecule

Choose all the answers that apply. fluorine (f) has an atomic number of 9 and an atomic weight of 18.99. fluorine has a. 9 protons b. 10 neutrons c. 18 electrons d. an atomic mass of 19 e. at least one isotope

The vapor pressure of ethanol is 1.00 × 102 mmhg at 34.90°c. what is its vapor pressure at 61.61°c? (δhvap for ethanol is 39.3 kj/mol.)