What volume of a 1.2 M solution of Na2CO3 can be made from 800 ml. of a 1 point
4.2 molar solution of this solute? (answer in Liters)

V₂ = 2.8 L

Explanation:

Given data:

Initial volume = 800 mL ( 800/1000 = 0.8 L)

Initial molarity = 4.2 M

Final volume = ?

Final molarity  = 1.2 M

Solution:

Formula:

M₁V₁ = M₂V₂

M₁ = Initial molarity

V₁ = Initial volume

M₂ = Final molarity

V₂= Final volume

M₁V₁ = M₂V₂

4.2 M × 0.8 L  = 1.2 M× V₂

3.36 M.L =  1.2 M× V₂

V₂ = 3.36 M.L/1.2 M

V₂ = 2.8 L

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.