Question

how many atoms are contained in 97.6g of platinum

Answer 1

Molar mass of platinum is = 195.084 g
195.084 g of platinum contains = 6.022$\times$10²³ atoms
97.6 g of platinum contains = $\frac{6.022\times {10}^{23}}{195.084}\times 97.6$
Number of atoms in 97.6 g of platinum = 3.012$\times$10²³ atoms