When vinegar and baking soda react, the mixture becomes cold to the touch and a gas and a new liquid substance are formed. Which best describes what is occurring in the reaction? The reaction is chemical and endothermic. The reaction is chemical and exothermic. The reaction is non-chemical and endothermic. The reaction is non-chemical and exothermic.

The reaction is chemical and endothermic.

Explanation:

The process taking place is a chemical reaction and is exothermic because endothermic means it is making things colder while releasing heat.

1. for the first question, we must find the mass of the anhydrous salt, mgso₄. the molar mass for mgso₄·7h₂o is 246.47 g/mol, while that of mgso₄ is 120.37 g/mol.7.834 g mgso₄·7h₂o * 1 mol mgso₄·7h₂o/246.47 g * 1 mol mgso₄/1 mol mgso₄·7h₂o * 20.37 g mgso₄/mol = 0.647 g mgso₄

2. mass of water = mass of sample - mass of anhydrous salemass of water = 7.834 - 0.647 = 7.19 gpercent water in hydrate = 7.19/7.834 * 100 = 91.74%

i think   the answer is c hope i'm right