Chapter 2 Atoms, Molecules, and Ions - Study Questions - Page 95c: 63

a) $1.9998\ mol $ b) $0.0017\ mol $ c) $2.1\times10^{-5}\ mol $ d) $0.250\ mol $

Atomic weights: $Cu: 63.546u,\ Li: 6.94u,\ Am: 243u,\ Al: 26.982u$ a) $127.08\ g \div 63.546\ g/mol = 1.9998\ mol $ b) $0.012\ g \div 6.94\ g/mol = 0.0017\ mol $ c) $5.0\times10^{-3}\ g \div 243\ g/mol = 2.1\times10^{-5}\ mol $ d) $6.75\ g \div 26.982\ g/mol = 0.250\ mol $