Question

how many atoms are there in 1.2 moles of carbon? (a) 18.02 (b) 6.62 x 10^34 (c) 6.022 x 10^23 (d) 7.23 x 10^23

Explanation:

Step1: Recall Avogadro's number

Avogadro's number ($N_A$) is $6.022\times 10^{23}$ atoms/mol.

Step2: Use the formula for number of atoms

The number of atoms ($N$) in a given number of moles ($n$) is $N = n\times N_A$. Here, $n = 1.2$ moles. So $N=1.2\times6.022\times 10^{23}$.

Step3: Calculate the result

$1.2\times6.022\times 10^{23}=7.2264\times 10^{23}\approx7.23\times 10^{23}$ atoms.

Answer:

$7.23\times 10^{23}$