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labwork [276]
3 years ago
10

How many elements have been discovered? A. 110 B. less than 110 C. more than 110

Chemistry
2 answers:
riadik2000 [5.3K]3 years ago
8 0
There are 115 known elements as of today (Feb. 13, 2016)

so, 'C' is the correct answer
Ivenika [448]3 years ago
6 0
C. more than 110. We have 115 elements known for Feb 2016.
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what is the concentration of a dextrose solution prepared by diluting 14 ml of a 1.0 m dextrose solution to 25 ml using a 25 ml
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The concentration of a dextrose solution prepared by diluting 14 ml of a 1.0 M dextrose solution to 25 ml using a 25 ml volumetric flask is 0.56M.

Concentration is defined as the number of moles of a solute present in the specific volume of a solution.

According to the dilution law, the degree of ionization increases on a dilution and it is inversely proportional to the square root of concentration. The degree of dissociation of an acid is directly proportional to the square root of a volume.

M₁V₁=M₂V₂

Where, M₁=1.0M, V₁=14ml, M₂=?, V₂=25ml

Rearrange the formula for M₂

M₂=(M₁V₁/V₂)

Plug all the values in the formula

M₂=(1.0M×14 ml/25 ml)

M₂=14 M/25

M₂=0.56 M

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