Which of the units listed below are smaller than a gram? Select all that apply. ug
ng
mg
kg

µg

ng

mg

Explanation:

1 kilogram(kg)=1 000 g

1 gram(g)=1 g

1 milligram(mg)=0.001 g

1 microgram(µg)=0.000 001 g

1 nanogram(ng)=0.000 000 001 g

step-by-step explanation:

whole numbers, zero or greater

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%