Question

how many moles of water, h₂o, contain 2.0 × 10²² molecules of water? (see the
express the quantity in moles to two significant figures.
view available hint(s)
hint 1. tips for calculations involving scientific notation
hint 2. how to approach the problem
hint 3. state the given and needed quantities
hint 4. identify the conversion factor using avogadros number
hint 5. set up the problem to calculate the number of moles of h₂o

Explanation:

Step1: Recall Avogadro's number

Avogadro's number is $6.022×10^{23}$ molecules/mol.

Step2: Calculate moles of water

Moles = Number of molecules / Avogadro's number
$n = \frac{2.0×10^{22}}{6.022×10^{23}}$

Step3: Simplify the expression

$n ≈ \frac{2.0×10^{22}}{6.0×10^{23}} ≈ 0.033$ (rounded to two significant figures)

Answer:

0.033