Which term describes technology that operates on an atomic level

I think it’s Nanoscale :)) I’m 99% sure it is

The correct answer is nanoscale.

Explanation:

A branch of nanotechnology that utilizes standard size apparatuses to produce basic compositions and tools with dimensions on the range of few nanometers or even less, that is, 1 nm is equivalent to a billionth of a meter, that is, it operates at an atomic level. It has an application in sanitation, water purification, medicine, agriculture, and others.

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%