Scelta multipla
What is the significance of Avogadro's number? Avogadro's number is the number of -
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2. Atoms & Elements
Mole Concept
Scelta multipla
A sample contains 0.25 mol of NaCl. How many formula units of NaCl are present in the sample?
A
2.41 × 10^{22} formula units
B
3.01 × 10^{24} formula units
C
6.02 × 10^{22} formula units
D
1.51 × 10^{23} formula units
Guida verificata passo dopo passo1
Understand that the problem asks for the number of formula units in a given amount of moles of NaCl. A formula unit refers to the simplest ratio of ions represented in an ionic compound, here NaCl.
Recall Avogadro's number, which is the number of particles (atoms, molecules, or formula units) in one mole of a substance. Avogadro's number is \(6.02 \times 10^{23}\) formula units per mole.
Set up the relationship between moles and formula units using Avogadro's number: \(\text{Number of formula units} = \text{moles} \times 6.02 \times 10^{23}\) formula units/mole.
Substitute the given amount of moles (0.25 mol) into the equation: \(\text{Number of formula units} = 0.25 \times 6.02 \times 10^{23}\) formula units.
Perform the multiplication to find the total number of formula units in the sample.
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