025 grams of NaCl is dissolved to make 005ml of solution 025

Solution

Answer:

We need to calculate how many moles of NaCl are there in 0.25 grams.

So,

Number of moles = mass / molar mass
Molar mass of NaCl = 58.44
Number of moles = 0.25 / 58.44 = 0.00427 moles

So,

0.25 g of NaCl contains 0.00427 moles of NaCl.

Now,
Concentration = moles / volume
Therefore,

Concentration = 0.00427 / 0.05

= 0.0855 moles / mL