.250 moles of H2O to molecules

1.51 × 10²³ molecules

Explanation:

Given data:

Number of moles of water = 0.250 mol

Number of molecules of water = ?

Solution:

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.

For example,

1 mole = 6.022 × 10²³ molecules of water

0.250 mol × 6.022 × 10²³ molecules / 1 mol

1.51 × 10²³ molecules

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.