The density of water is 1 g/cm3. Brent used the following method to convert 1 g/cm3 to kg/m3. (1 kg = 1,000 g and 1 m = 100 cm)
What is the error in Brent's conversion method?

A - 1 kg should be written as 1 g.
B - (1 m)3 should be written as (1 cm)3.
C - 1,000 kg should be written as 1,000 g.
D - (100 cm)3 should be written as (100 m)3.

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%