Two Phosphoric Acid Molecules Can Combine to Make Pyrophosphoric Acid

question 36

Multiple Choice

Two phosphoric acid molecules can combine to make pyrophosphoric acid and another molecule as shown here. The pyrophosphoric acid molecule is a phosphoester and is a structural element in the ADP/ATP metabolic energy system. What molecule is represented by the question mark in the structural reaction equation below?

• A) O₂
• B) OH^-
• C) H₂O
• D) PO
• E) H₂

---

Definitions:

Spread

The difference between two prices, rates, or yields, often referring to the gap between bid and ask prices of a security.

Underwriters' Buying Price

The price at which underwriters purchase securities from the issuer before selling them to the public.

Offering Price

The price at which new shares are offered to the public by an issuer or an underwriter in initial public offerings or secondary offerings.

Dilution

Loss in existing shareholders’ value, in terms of either ownership, market value, book value, or EPS.