Which best describes the convection currents in Earth’s mantle? They transfer potential energy away from Earth’s core toward its crust.
They transfer thermal energy away from Earth’s core toward its crust.
They transfer chemical and thermal energy in a circular pattern.
They transfer chemical and potential energy in a circular pattern.

(B) They transfer thermal energy away from Earth’s core toward its crust.

Explanation:

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B. They transfer thermal energy away from Earth's core toward it's crust.

Explanation:

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%