1. d.4.125 x 10²⁴ atoms
2. c. 487.73 g
<h3>Further explanation </h3>
The mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
1. 7 moles of phosphorus, so n=7, then number of atoms :
2. 2.5 moles of Pt, so n=2.5, the mass of Pt(MW=195,084 g/mol) :