How many moles are 2.50x10^21 atoms of silicon?

Explanation:

To find the number of moles of a substance given it's number of entities we use the formula

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question

N = 2.50 × 10²¹ atoms of silicon

So we have

We have the final answer as

Hope this helps you

a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.