Answer
a) $0.696\ mol $
b) $7.38\times10^{-3}\ mol $
c) $1.7\times10^{-5}\ mol $
d) $7.49\times10^{-3}\ mol $
Work Step by Step
Atomic weights: $Na: 22.990u,\ Sn: 118.71u,\ Pt: 195.08u,\ Xe: 131.29u$
a) $16.0\ g \div 22.990\ g/mol = 0.696\ mol $
b) $0.876\ g \div 118.71\ g/mol = 7.38\times10^{-3}\ mol $
c) $0.0034\ g \div 195.08\ g/mol = 1.7\times10^{-5}\ mol $
d) $0.983\ g \div 131.29\ g/mol = 7.49\times10^{-3}\ mol $
