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Leya [2.2K]
3 years ago
13

We call the elements in the blocks of periods 4-7 and groups 3-12 the

Chemistry
1 answer:
d1i1m1o1n [39]3 years ago
7 0
The elements in the blocks of period 4-7 and group 3-12 in the periodic table are in the d-block and d-block elements  are known as transition metals or transition elements.
Arsenic is a metalloid and it has four electron shells and five valence electrons.
the s and p orbital of Arsenic have 2 and 3 electrons respectively and which makes five valence electrons.



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Answer;

30 atoms

Explanation;

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The equation for the reaction would be;

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How many liters are in a .00813M solution that contains 1.55 g of KBr?
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Answer:

                      1.602 L (or) 1602 mL

Explanation:

             Molarity is the amount of solute dissolved per unit volume of solution. It is expressed as,

                         Molarity  =  Moles / Volume of Solution    ----- (1)

Rearranging above equation for volume,

                         Volume of solution  =  Moles / Molarity    -------(2)

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First calculate Moles for given mass as,

                   Moles  =  Mass / M.mass

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Now, putting value of Moles and Molarity in eq. 2,

                         Volume of solution  =  0.0130 mol / 0.00813 mol.L⁻¹

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or,

                         Volume of solution  =  1602 mL

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