Taking into account the definition of Avogadro's number and molar mass, 4.806 grams of water are present in 1.61×10²³ molecules.
Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.
The molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.
Taking into account the definition of Avogadro's Number, you can apply the following rule of three: if 6.023×10²³ molecules are contained in 1 mole of water, then 1.61×10²³ molecules are contained in how many moles of water?
amount of moles of water= (1.61×10²³ molecules× 1 mole)÷ 6.023×10²³ molecules
amount of moles of water= 0.267 moles
Now, taking into account the definition of molar mass, and knowing that the molar mass of water is 18 g/mole, you can apply the following rule of three: If by definition of molar mass 1 mole of the compound contains 18 grams, 0.267 moles of the compound contains how much mass?
[tex]mass= \frac{0.267 molesx 18 grams}{1 mole}[/tex]
mass= 4.806 grams
Finally, 4.806 grams of water are present in 1.61×10²³ molecules.
Learn more about
Avogadro's Number:
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molar mass:
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