Answer to Question #133335 in Chemistry for jannaaaaaaaaaa

Question

1) Calculate the number of moles of atoms contained in 2.35grams Lithium?

Answer 1

Solution:

Mole: the amount of a substance that contains 6.02×10²³ respective particles of that substance.

Moles of lithium = Mass of lithium / Molar mass of lithium

The molar mass of lithium is 6.941 g/mol.

Thus:

Moles of lithium = (2.35 g) / (6.941 g/mol) = 0.338 mol = 0.34 mol

The number of atoms of lithium = Moles × N_a = 0.34 mol × 6.02×10²³ = 2.047×10²³ atoms of lithium

Answer: 0.34 mol is the number of moles of lithium.

The number of atoms of lithium is 2.047×10²³ atoms.