Answer to Question #165255 in Chemistry for Armando

Question

Convert 3.25x10⁵ grams Pb into molecules

Answer 1

Solution:

Moles of Pb = Mass of Pb / Molar mass of Pb

The molar mass of Pb is 207.2 g mol^-1.

Hence,

Moles of Pb = 3.25×10⁵ g / 207.2 g mol^-1 = 1568.533 mol

Moles of Pb = 1568.533 mol

One mole of any substance contains 6.022×10²³ atoms/molecules.

Hence,

Pb molecules = (1568.533 mol of Pb) × (6.022×10²³ molecules / 1 mol) = 9.446×10²⁶ Pb molecules

9.446×10²⁶ Pb molecules = 9.45×10²⁶ Pb molecules

Answer: 9.45×10²⁶ Pb molecules are present in 3.25x10⁵ grams Pb.