Question

calculate the number of moles nacl in 1.69 x 10^{25} formula units nacl.

Explanation:

Step1: Recall Avogadro's number

Avogadro's number \(N_A = 6.022\times10^{23}\text{ formula units/mol}\)

Step2: Use the formula \(n=\frac{N}{N_A}\)

Here \(N = 1.69\times 10^{25}\text{ formula units}\) and \(N_A=6.022\times10^{23}\text{ formula units/mol}\)

$$n=\frac{1.69\times 10^{25}}{6.022\times10^{23}}$$

$$n=\frac{1.69}{6.022}\times10^{25 - 23}$$

$$n\approx0.281\times10^{2}$$

$$n = 28.1\text{ mol}$$

Answer:

\(28.1\text{ mol}\)