## Essential University Physics: Volume 1 (3rd Edition)

To determine the number of Hydrogen atoms: $N=\frac{4cm}{0.1nm}$ $N=\frac{4\times 10^{-2}m}{0.1\times 10^{-9}m}$ $N=\frac{4\times 10^{-2}m}{1\times 10^{-10}m}$ $N=4\times 10^8atoms$
To determine the number of Hydrogen atoms: $N=\frac{4cm}{0.1nm}$ $N=\frac{4\times 10^{-2}m}{0.1\times 10^{-9}m}$ $N=\frac{4\times 10^{-2}m}{1\times 10^{-10}m}$ $N=4\times 10^8atoms$