Question

The visible universe is estimated to contain 10 22 stars. How many moles of stars are present in the visible universe?

Answer 1

1 Mole of stars = 6.022×10^23 stars
x moles of star = 10^22 stars

6.022×10^23/1 = 10^22/x
x = (1/6.022)×(10^22/10^23)
x = 0.166 × 1/10
x = 0.016 moles

Hence there are 0.016 moles of stars present in visible universe.

Answer 2

To find the number of moles in 90 gram of water