Answer:
2.71 × 10²⁰ molecules
Explanation:
Given data:
Mass of water = 8.050 × 10³ g
Number of molecules = ?
Solution;
First of all we will calculate the number of moles of water,
Number of moles = mass/molar mass
Number of moles = 8.050 × 10³ g / 18 g/mol
Number of moles = 0.45 × 10³ mol
1 mole contain 6.022 × 10²³ molecules,
0.45 × 10³ mol × 6.022 × 10²³ molecules / 1 mol
2.71 × 10²⁰ molecules
The number 6.022 × 10²³ is called 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.
