Question

calculate the no. of moles in 3.91 x 10¹⁹ atoms of magnesium​

Answer 1

1 MOLE OF MAGNESIUM CONTAINS 6.022×10²³ ATOMS

USING UNITARY METHOD:,

:)6.022×10²³ atoms = 1 mole

:) 1 atom = 1/6.022×10²³ mole

:)So,3.91×10¹⁹ atoms=3.91×10¹⁹/6.022×10²³

=6.49×10^-⁵ mole