Question

an atom of magnesium weighs 3.98 into 10-²³gram calculate the number of atoms in 12 gram of magnesium​

Answer 1

Answer:

An atom of magnesium contains = 6.022×1023 atoms

3.98×10-23 g of magnesium contains = 1 atom of magnesium

12 g of magnesium contains = 13.98×10−23×12 = 3.01×1023 atoms of magnesium

Answer 2

The mass of one atom of an element,

A=3.98×10

−23

g

We know, 1 mole of an atom is 6.023×10

23

atoms.

1 mole of an atom = its atomic weight

∴ Atomic weight of element A=3.98×10

−23

×6.023×10

23

=23.97g≈24g