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

1 Answer
Trevor Ryan.
Feb 13, 2016

#1.54g#

Explanation:

#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#.

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