Question

If 2 g NaOH is dissolve in water to make solution upto 250 cm3. Give molarity of the solution.
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Answer 1

Answer:

0.200 mol/L or 0.200 M

Explanation:

Find the gram formula mass (GFM) of NaOH by adding up the gram formula masses of each element (Na, O, and H):

GFM=(22.99g+16.00g+1.008g)/mol NaOH=39.998g/mol NaOH

There is 1cm³ per mL.

There are 1000mL per L.

Use these facts to convert g/cm³ to mol/L.

(2g NaOH/250cm³)(1cm³/1mL)(1000mL/L)(1 mol NaOH/39.998g)=0.200 mol/L

M=mol/L

The answer is 0.200 mol/L or 0.200 M.