8. A 50.0 mL 0.05 mol/l solution of sodium cloride (NaCl) was mixed with 100.0 mL of 0.02 mol/l NaCl solution. What is the mass percent of NaCl in the final solution?
Assume the volumes are additive and their densities 21 g/mL. The molar mass of
NaCl is 58.5 g/mol. (10 points)

Explanation:

Data:

Solution 1: V₁ =   50.0 mL; c₁ = 0.05 mol·L⁻¹

Solution 2: V₂ = 100   mL; c₂ = 0.02 mol·L⁻¹

NaCl         :   ρ =     2.1 g/mL  

1. Solution 1

(a) Moles of NaCl

(b) Mass of NaCl

(c) Volume of NaCl

(d) Volume of water

V = 50.0 mL - 0.070 mL = 49.9 mL

(e) Mass of water

2. Solution 2

(a) Moles of NaCl

(b) Mass of NaCl

(c) Volume of NaCl

(d) Volume of water

V =100 mL - 0.055 mL = 100 mL

(e) Mass of water

3. Combined solutions

(a) Mass of NaCl

Mass of NaCl = 0.015 g + 0.012 g = 0.018 g

(b) Mass of water

Mass of water = 49.9 g + 100 g = 150 g

(c) Mass percent

explanation: it gains negative electrons, therefore becoming negatively charged. as charge cannot be created, nor destroyed, only transferred, this leaves the wool positive. now that they have opposite charges, the two items attract.

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be