3. Living cells are classed as either prokaryotic or eukaryotic. Which of the following characteristic(s) identify eukaryotic cells? Select all that apply. mostly single-celled organisms
are the smallest unit of living matter
✓ contain cytoplasm
are produced by division of another cell
comprise most multi-celled organisms
contain DNA
have membrane-bound organelles
have a nucleus

The correct answer is -

Explanation:

The cell can be either prokaryotic or eukaryotic. Eukaryotic cells are the cell known as true cells as they have a true nucleus present and the main feature to identify a eukaryotic cell.

Other than this the linear DNA and double membrane bound organelles are characterstic feautre of these cells and they compramise mostly of multicellular organisms.

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%