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How many moles are in 1.9 x 10^25 formula units of NaCl?

A. 3.2 moles
B. 5.6 moles
C. 6.02 moles
D. 9.02 moles

1 Answer

7 votes

Final answer:

To find the number of moles in 1.9 x 10^25 formula units of NaCl, divide the number of units by Avogadro's number, which gives approximately 3.2 moles. The correct answer is A. 3.2 moles.

Step-by-step explanation:

To determine how many moles are in 1.9 x 1025 formula units of NaCl, we can use Avogadro's number, which is 6.022 x 1023 formula units per mole. This is the most important conversion factor in chemistry for converting between particles and moles. So, the calculation would look as follows:

Number of moles = (Number of formula units) / (Avogadro's number)

Number of moles = 1.9 x 1025 / 6.022 x 1023

This gives us approximately 3.2 moles of NaCl. Therefore, the correct answer is A. 3.2 moles.

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