Question

question 5 (2 points)
how many moles are in 1.40x10^22 formula units of crbr3?
note: if your answer is in scientific notation, use e for x10. (avagadro’s number would be 6.02e23)
answer: ______ moles (3 significant figures)
blank 1:

Explanation:

Step1: Recall mole - formula unit relationship

The relationship between the number of formula units ($N$), the number of moles ($n$), and Avogadro's number ($N_A$) is $n=\frac{N}{N_A}$.

Step2: Substitute the given values

We are given $N = 1.40\times10^{22}$ formula units and $N_A=6.02\times 10^{23}\text{ formula units/mol}$. So, $n=\frac{1.40\times 10^{22}}{6.02\times 10^{23}}$.

Step3: Calculate the number of moles

$n=\frac{1.40}{6.02}\times10^{22 - 23}\approx0.233\times10^{- 1}=0.0233\text{ mol}$.

Answer:

$0.0233$