Which of the following measurements would be expected to contain the greatest number of significant figures? Group of answer choices

the volume of a marble using a string and a metric ruler that measures to the ones place

the mass of a marble on a centigram balance

the volume of a marble by water displacement in a 50 mL beaker

the volume of a marble by water displacement using a 10 mL graduated cylinder

trigonal pyramidal

tetrahedral

trigonal planar

bent

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%