Answer:
2.0×10⁻⁶ mol
Prefix = (2)
exponent = (-6)
Explanation:
Given data:
Number of molecules of water = 1.23×10¹⁸ molecules
Number of moles of water = ?
Solution:
Avogadro number:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ molecules of water
1.23×10¹⁸ molecules × 1 mol / 6.022 × 10²³ molecules
0.20×10⁻⁵ mol
2.0×10⁻⁶ mol
Prefix = (2)
exponent = (-6)
