Question

How many moles of cesium (Cs) atoms are in 675 g Cs?

Answer 1

well you need to look up the molar mass of Cs on the periodic table and then multiply the number of grams times (1/molar mass) of Cs

\[\cancel\grams\ Cs*(\frac{ moles }{ \cancel\grams_{molar~mass} } )= moles~Cs\]

Answer 2

well easy way to remember this is
no. of moles = mass divided by the molar mass
if no. of moles = n
mass =m
molar mass = M
\[n= \frac{ m }{ M }\]

Answer 3

The units are as follows
no. of moles is from mol
mass is from grams (g)
molar mass is from grams per moles (gmol^-1)