Question:
The visible universe is estimated to contain $10^{22}$ stars. How many moles of stars are present in the visible universe?
Solution:
No. of stars present in visible universe $=10^{22}$
No. of moles of stars present $=\frac{10^{22}}{6.022 \times 10^{23}}=0.0166 \mathrm{~mol}$.