# How many molecules are in 0.400 moles of N_2O_5?

Jan 20, 2016

$\text{0.400 mol N"_2"O"_5}$ contains $\text{2.41 molecules N"_2"O"_5}$.
$1 \text{mole N"_2"O"_5"="6.022xx10^23"molecules N"_2"O"_5}$
To determine the number of molecules of $\text{N"_2"O"_5}$ in the given number of moles, multiply the given moles times $6.022 \times {10}^{23} \text{molecules/mol}$.
0.400cancel("molN"_2"O"_5)xx(6.022xx10^23"molecules N"_2"O"_5)/(1cancel("mol N"_2"O"_5))="2.41xx10"^23 "molecules N"_2"O"_5"