Answer:
no. of molecules of salt = 5.046 x 10²²
Explanation:
Data given:
Volume of the Solution = 27 L
Molarity of the Solution = 0.003
Number of molecules of salt = ?
Solution:
First find number of moles of salt
Formula used
Molarity = moles of solute / L of solution
Rearrange the above equation
moles of solute = Molarity x L of Solution
Put values in above equation
moles of solute = 0.003 x 27 L
moles of solute = 0.081 moles
Now we can find the number of molecules of salt
Formula used to find no. of molecules
no. of moles = no. of molecules / Avogadro's number
Avogadro's number = 6.23 x 10²³
Now rearrange the above equation
no. of molecules = no. of moles x Avogadro's number . . . . . . . (1)
Put values in Equation 1
no. of molecules = 0.081 moles x 6.23 x 10²³
no. of molecules = 5.046 x 10²²
So,
no. of molecules of salt = 5.046 x 10²²
