Helium balloons! Fun at a party, But do you know one chemical property of helium? Helium is an odorless, colorless gas at room
temperature. It is less dense than air. That's why helium balloons float. It is a non-reactive gas, a member of the Noble gas
family. Its melting point is -2722 °C and its boiling point is -268.93 °C
Consider the paragraph above. What is one chemical property of helium?
A)
colorless
non-reactive
less dense than air
D)
boiling point is -268.93 °C
Shiny

answer is: empirical formula is tl₂o. if we use 100 grams of compound, tha:

m(tl) = 96.2%  · 100 g ÷ 100%.

m(tl) = 96.2 g.

n(tl) = m(tl)  ÷ m(tl). n(tl) = 96.2 g  ÷ 204.4 g/mol.

n(tl) = 0.47 mol. m(o) = 3.77 g. n(o) = m(o)  ÷ m(o). n(o) = 3.77 g  ÷ 16 g/mol. n(ag) = 0.235 mol. n(tl) . n(o) = 0.47 mol : 0.235 mol /0.235. n(tl) . n(o) = 2 : 1.

m(tl₂o) = 204.4 g/mol  · 2 + 16 g/mol = 424.8 g/mol.

m(compound) = 456. 8 g/mol - 424.8 g/mol = 32 g/mol ( 2 oxygens); tl₂o₃.