# Question e0b23

May 14, 2015

That many molecules will have a mass of 88.02 g.

$N$ is just a notation used for Avogadro's number, which represents the number of molecules present in 1 mole of a substance. In your case,

$N = 6.022 \cdot {10}^{23} \text{molecules}$ $C {O}_{2}$

Since you have to calculate the mass of 2N molecules, which is equivalent to having 2 moles of $C {O}_{2}$, you'll get

2cancel("moles"CO_2) * "44.01 g"/(1cancel("mole"CO_2)) = "88.02 g"

which is equivalent to

2cancel("N molecules"CO_2) * "44.01 g"/(cancel(N" molecules"CO_2)) = "88.02 g"#