Even before modern observations provided evidence that Supports the Theory of Plate Tectonics, people developed
theories that the continents were once joined together. Using
only maps, they observed that -
A
most of the larger land masses are in the Northern
Hemisphere
continents with the most moderate climates were
located near the Equator.
the shapes of continents appeared to allow them to fit
together
c.
D
the oceans have decreased in size throughout the
history of Earth

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%

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.