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kirill [66]
3 years ago
15

Which of the following describes the element Kr? Choose all that apply. (A) belongs to a group consisting entirely of gases form

s a basic solution in water. (B) is very reactive as a metal. (C) is one of the group of the least reactive elements. (D) reacts vigorously with alkali metals to form salts. (E) consists of diatomic molecules in elemental form.
Chemistry
1 answer:
Alexxx [7]3 years ago
3 0

Answer:

The correct answer is option C.

Explanation:

Kr is the symbol of a noble gas named krypton.It belongs to the group 18 of the periodic table in which all the elements are less reactive.

These noble gases are highly inert and less reactive due to:

  • Completely filled ns^2np^6 electronic configuration in their valence shell.
  • High ionization enthalpies.
  • Positive value of electron gain enthalpy.
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Empirical formula is the simplest ratio of components making up a compound.

The percentage composition of each element has been given

therefore the mass present of each element in 100 g of compound is

                      B                                   N                         H

mass          40.28 g                         52.20 g                 7.53 g

number of moles  

                 40.28 g / 11 g/mol      52.20 g / 14 g/mol    7.53 g / 1 g/mol

                = 3.662 mol                  = 3.729 mol             = 7.53 mol

divide the number of moles by the least number of moles, that is 3.662

                3.662 / 3.662              3.729 / 3.662              7.53 / 3.662

               = 1.000                           = 1.018                        = 2.056

the ratio of the elements after rounding off to the nearest whole number is

B : N : H = 1 : 1 : 2

therefore empirical formula for the compound is B₁N₁H₂          

that can be written as BNH₂    

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B 1.23 g/cc

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