Question

practice: what is a mole?
in a 1.5 mole sample of water, h₂o, how many particles are present?
in the first box select the correct amount, in the second box select the correct unit
image of a diagram, omitted
options for amount: 3.00×10²⁴, 2.49×10⁻⁴⁴, 9.03×10²³, 4.01×10²³
options for unit: atoms, formula units, molecules, moles

Explanation:

Step1: Recall Avogadro's number

Avogadro's number is \( 6.02 \times 10^{23} \) particles per mole. For a substance like water (\(H_2O\)), the particles are molecules.

Step2: Calculate the number of particles

We have 1.5 moles of \(H_2O\). The number of molecules is moles multiplied by Avogadro's number: \( 1.5 \, \text{mol} \times 6.02 \times 10^{23} \, \text{molecules/mol} \).
\[
1.5 \times 6.02 \times 10^{23}= 9.03\times 10^{23}
\]
And the unit for water particles (molecules) is "molecules".

Answer:

First box: \( 9.03 \times 10^{23} \), Second box: molecules