What is the mass of $4.75 * 10^21$ platinum atoms?

Question

33606 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2016-02-13T17:27:52

$1.54g$

$6.023xx10^23$ Pt atoms constitutes $1$ mole of Pt.

Hence, by ratio and proportion, $4.75xx10^21$ atoms constitutes $0.0078864$ moles.

Hence the mass will be the product of the moles with the molar mass,

$m=nxxM_r$

$=0.0078864molxx195.1g//mol$

$=1.54g$ .

What is the mass of 4.75 * 10^214.75 * 10^21 platinum atoms?