Question

How many grams are in 0.040 moles zirconium (Zr)? Only 2 significant numbers?

Answer 1

Mass of Zirconium (Zr) in 0.040 moles : 3.6 g

Further explanation

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

Moles can also be determined from the amount of substance mass and its molar mass

`\tt n(mol)=(m(mass))/(MW(molecular~weight))`

moles of Zirconium : 0.04

mass of Zirconium (MW=91,224 g/mol) :

`\tt mass=mol* MW\\\\mass=0.04* 91,224\\\\mass=3.6~g`