Question

how many formula units are in 3.0 moles of sb2s3?
? × 10^? formula units of sb2s3
remember: 1 mole = 6.02 × 10^23 formula units
enter the coefficient in the green box and the exponent in the yellow box.

Explanation:

Step1: Use Avogadro's number formula

Formula units = moles × Avogadro's number. Given moles = 3.0, Avogadro's number \(N_A=6.02\times10^{23}\) formula units/mole.
So, formula units \(=3.0\times6.02\times10^{23}\)

Step2: Calculate the coefficient and exponent

\(3.0\times6.02 = 18.06\). In scientific notation, \(18.06\times10^{23}=1.806\times 10^{24}\) (rounded to two significant figures as 3.0 has two significant figures), so it can be written as \(1.8\times10^{24}\)

Answer:

Coefficient: \(1.8\), Exponent: \(24\)