2 years ago

On the periodic table, what is used to determine the order of elements? (Use your own words? Help please!!!

2 answers:

5 0

in periodic table, elements are arranged according to atomic number; beginning with Hydrogen at 1, Helium at 2 n so on. atomic number represents the no. of proton or electron each neutral element has.

Angelina_Jolie [31]2 years ago

4 0

Elements are listed in order of increasing atomic number from the left to the right.

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A chemist must dilute of aqueous aluminum chloride solution until the concentration falls to . He'll do this by adding distilled

marshall27 [118]

Answer:

0.257 L

Explanation:

The values missing in the question has been assumed with common sense so that the concept could be applied

Initial volume of the AICI3 solution $=23.1 \mathrm{mL}$

Initial Molarity of the solution $=833 \mathrm{mM}$

Final molarity of the solution $=75.0 \mathrm{mM}$

Final volume of the solution $=?$

From Law of Dilution, $M_{f} V_{f}=M_{i} V_{i}$

$\Rightarrow V_{f}=\frac{M_{i} V_{i}}{M_{f}}=\frac{833 \mathrm{mM} \times 23.1 \mathrm{mL}}{75.0 \mathrm{mM}}=256.564 \mathrm{mL}=0.256564 \mathrm{L}=0.257 L$