A compound named for its lack of this substance is produced by the condensation of two carboxylic acids. On a phase diagram for this molecule, the lower part of the solid-liquid boundary has negative slope. Twenty-three molecules of this substance surround four molecules of methane to form a clathrate. This molecule has an unusually small bond angle of 104.5 degrees, since it has two lone pairs on its central atom. Reagen
A compound named for its lack of this substance is produced by the condensation of two carboxylic acids. On a phase diagram for this molecule, the lower part of the solid-liquid boundary has negative slope. Twenty-three molecules of this substance surround four molecules of methane to form a clathrate. This molecule has an unusually small bond angle of 104.5 degrees, since it has two lone pairs on its central atom. Reagents dissolved in it are indicated by the letters "aq" in parentheses. The calorie was defined in terms of this compound's unusually high specific heat, which is due to hydrogen bonding. For 10 points, name this compound with chemical formula H2O. 
A compound named for its lack of this substance is produced by the condensation of two carboxylic acids.
water [or dihydrogen monoxide; or oxidane; or H2O before it is read] 