Question

1-which one of the following contain only element
a)air ,water ,oxygen
b)hydrogen, oxygen ,brass c)air ,water,fire earth
d) calcium, sulphur ,carbon
2- if one mole of carbon contain atom what is the number of atom conatin in 12g of Mg
a)X b)0.5X c)2X d)1.5X ​

Answer 1

Answer:

1.nothing 2 nothing pls mark me as hero

Answer 2

Explanation:

2 ans

6.022

The value of mole is equal to the number of atoms in exactly 12 g of pure carbon 12. 12.00g c-12 =1 mole c-12 atoms=6.022×1023 atoms.The number of particles in 1 mole is called Avogadro's number(6.0221421×1023).