The mass of a sulfur atom is 32.0 u, and the mass of a fluorine atom is 19.0 u. what is the mass of a mole of sulfur hexafluoride (uf.)

The mass of sulfur hexafluoride is 146 u.

Explanation:

Mass of a mole of a substance is defined as the molar mass of that substance.

It is defined as the sum of every component each multiplied by the times they appear in that substance.

We are given:

Mass of sulfur atom = 32.0 u

Mass of fluorine atom = 19.0 u

The chemical formula for sulfur hexafluoride is

So, the molar mass of

Hence, the mass of sulfur hexafluoride is 146 u.

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue

d₁ = displacement of tern from arctic to antarctic = 11000 miles

d₂ = displacement of tern from antarctic to arctic =   - 11000 miles

d = total displacement for the journey

total displacement for the journey is given as

d = d₁ + d₂

d = 11000 + (-11000)

d = 0 miles

t₁ = time of travel from arctic to antarctic = 3 months = 3 x 30 days = 90 days

t₂ = time of travel from antarctic to arctic = 3 months = 3 x 30 days = 90 days

t = total time of travel

total time of travel is given as

t = t₁ + t₂

t = 90 + 90

t = 180 days

average velocity is given as

average velocity = total displacement/ total time

v = d/t

v = 0/180

v = 0 miles/day