Question

1. calculate the number of moles in 3.79×10²³ molecules carbon dioxide.

0.630 mol
0.630×10²³ mol
0.630×10²⁴ mol
22.8 mol
clear all

Explanation:

Step1: Recall Avogadro's number

Avogadro's number $N_A = 6.022\times 10^{23}\text{ molecules/mol}$.

Step2: Use the mole - molecule conversion formula

The number of moles $n=\frac{N}{N_A}$, where $N = 3.79\times 10^{23}$ molecules. So $n=\frac{3.79\times 10^{23}}{6.022\times 10^{23}}$.

Step3: Calculate the value of n

$n=\frac{3.79}{6.022}\approx0.630$ mol.

Answer:

0.630 mol