How many grams are in 1.96 x 10^-4 mol of C2H4O2?

Iknow #2 is d. i just need to know why

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.

In what environment would mineral formation caused by high pressures and high temperatures most likely occur?