mass is a measure of the mass of one atom of a particular element. What two words complete the sentence?

In the reaction between a crushed antacid tablet and vinegar what gas is emitted

Sodium nitrite (nano2) reacted with 2−iodooctane to give a mixture of two constitutionally isomeric compounds of molecular formula c8h17no2 in a combined yield of 88%. draw reasonable structures for these two isomers. click the "draw structure" button to launch the drawing utility. place the two compounds in the appropriate boxes below.

Which statement best describes the function of enzymes?