The given question is incomplete. the complete question is : If 5.15 g
is dissolved in enough water to make exactly 323 ml of solution, what is the molar concentartion of nitrate ion.
Answer: The molar concentartion of nitrate ion is 0.195.
Explanation:
Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution.
Given : 5.15 g of
is dissolved
Volume of solution = 323 ml
where,
n= moles of solute
= volume of solution = 323 ml

As 1 M of
gives 3 M of
ions.
Thus 0.065 M of
gives =
of
ions.
The molar concentartion of nitrate ion is 0.195.
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6.022 × 10^23 × 1.45 × 10^24 = 8.7319 × 10^47
Answer: I think it's D
Explanation: None of the other options are true.