Answer
To calculate the number of atoms, molar mass is multiplied with Avogadro's number
(a) 1.44 x 6.022 x $10^{23}$ = 8.67 x $10^{23}$ atoms
(b) 9.77 x 6.022 x $10^{23}$ = 5.88 x $10^{24}$ atoms
(c) 0.099 x 6.022 x $10^{23}$ = 6.0 x $10^{22}$ atoms
Work Step by Step
To calculate the number of atoms, molar mass is multiplied with Avogadro's number
(a) 1.44 x 6.022 x $10^{23}$ = 8.67 x $10^{23}$ atoms
(b) 9.77 x 6.022 x $10^{23}$ = 5.88 x $10^{24}$ atoms
(c) 0.099 x 6.022 x $10^{23}$ = 6.0 x $10^{22}$ atoms