Question

if i add 2 moles of NaCL into 100ml of h2o calculate concentration of solution?​

Answer 1

Answer:

Divide the mass of the solute by the total volume of the solution. Write out the equation C = m/V, where m is the mass of the solute and V is the total volume of the solution. Plug in the values you found for the mass and volume, and divide them to find the concentration of your solution.

Calculating Molarity Given Moles and Volume

First, we must convert the mass of NaCl in grams into moles. We do this by dividing by the molecular weight of NaCl (58.4 g/mole). Then, we divide the number of moles by the total solution volume to get concentration. The NaCl solution is a 0.1 M solution.

Solution

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Correct option is B)

100 mL of 2 M solution will contain

1000mL/L

100mL

×2mol/L=0.2 moles of NaCl

The atomic masses of Na and Cl

2

are 23 g/mol and 35.5 g/mol respectively.

The molar mass of NaCl=23+35.5=58.5 g/mol

0.2 moles of NaCl corresponds to

0.2×58.5=11.7 grams