Answer:
Step-by-step explanation:
Given data:
Number of particles of phosphorous = 1.2 × 10²⁵
Number of moles = ?
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.
Number of particles of phosphorous = 1.2 × 10²⁵ particles
1 mole = 6.022 × 10²³ particles
1.2 × 10²⁵ particles × 1 mole / 6.022 × 10²³ particles
0.1993 × 10² mol
19.93 mole
Q 3:
Given data:
Number of moles of calcium = 0.630 mol
Number of particles = ?
Solution:
The number 6.022 × 10²³ is called Avogadro number.
18 g of water = 1 mole = 6.022 × 10²³ molecules of water
1.008 g of hydrogen = 1 mole = 6.022 × 10²³ particles of hydrogen
For 0.63 moles:
1 mole = 6.022 × 10²³ particles
0.63 mol × 6.022 × 10²³ particles / 1 mol
3.79 × 10²³ particles
Q 4:
Given data:
Number of moles = 4 mol
Number of particles = ?
Solution:
The number 6.022 × 10²³ is called Avogadro number.
18 g of water = 1 mole = 6.022 × 10²³ molecules of water
1.008 g of hydrogen = 1 mole = 6.022 × 10²³ particles of hydrogen
For 4 moles:
1 mole = 6.022 × 10²³ particles
4 mol × 6.022 × 10²³ particles / 1 mol
24 × 10²³ particles
2.4 × 10²⁴ particles