Answer:
0.271 × 10²³ particles
Explanation:
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,
18 g of water = 1 mole = 6.022 × 10²³ molecules of water
1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen
For 4.50 g of CaCO₃:
100.1 g of CaCO₃ = 1 mole of CaCO₃ = 6.022 × 10²³ particles of CaCO₃
4.5 /100.1 = 0.045 mol
Particles in 0.045 mol:
0.045 ×6.022 × 10²³ particles
0.271 × 10²³ particles
