While performing an experiment involving a reaction between two chemicals, the scientist observes that the reaction container has become warm. the observation is an example of: qualitative data quantitative data both qualitative and quantitative data the observation is not considered data

If he measures "How much warmer [which he should]," then he would be measuring quantity and B would be the answer.

Since he is only observing that the reaction container has become warmer, then qualitative data is all that he is measuring. The answer is A

C is not true "How much warmer" is not answered.

The observation is not a number but  it is a property. It is qualitative as color would be. (If a reaction changes color it would be qualitative).

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%

there is none because earth is stationary and flat.