1 Answer

Andrei Catinean · Answer 1 · 2021-05-17T01:38:56+0000

1. d.4.125 x 10²⁴ atoms

2. c. 487.73 g

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 :

$\tt N=7* 6.02* 10^(23)\\\\N=4.215* 10^(24)$

2. 2.5 moles of Pt, so n=2.5, the mass of Pt(MW=195,084 g/mol) :

$\tt mass=mol* MW\\\\mass=2.5* 195,084\\\\mass=487.73~g$

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