Question

A helium balloon contains 0.38{\rm g} of helium.
Given the molecular weight of helium is 4.0 \rm g/mol, how many moles of helium does it contain?

Express your answer using two significant figures.

Answer 1

\[
\text{nbumber of moles}=\frac{\text{amount of substance in grams}}{\text{molecular weight expressed in grams}}
\]

Answer 2

\[={.38\over4.0}\approx0.095\rm{moles}\]

Answer 3

thanks!!!!!
that helps out a lot!!

Answer 4

you are welcome