Answer
a) $1.595 moles Cr$
b) $9.15\times10^{18} atoms Fe$
c) $2.198\times10^{22} atoms Ti$
d) $ 0.181 moles Hg$
Work Step by Step
Using Avagadro's Number, we can simply convert between atoms and moles as shown below:
a) $9.61\times10^{23} atoms Cr \times\frac{1 mole}{6.023\times10^{23} atoms} = 1.595 moles Cr$
b) $1.52\times10^{-5} moles Fe\times\frac{6.023\times10^{23} atoms}{1 mole} = 9.15\times10^{18} atoms Fe$
c) $0.0365 moles Ti\times\frac{6.023\times10^{23} atoms}{1 mole} = 2.198\times10^{22} atoms Ti$
d) $1.09\times10^{23} atoms Hg \times\frac{1 mole}{6.023\times10^{23} atoms} = 0.181 moles Hg$
