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chubhunter [2.5K]
3 years ago
6

Given the following list of atomic and ionic species, find the appropriate match for questions 2-4. Please Explain.

Chemistry
1 answer:
OleMash [197]3 years ago
4 0

Answer:

2. (C) K⁺; 3. (E) Hg⁺; 4. Hg⁺

Explanation:

We must first write the electron configurations of the different species.

(A) Fe²⁺

Fe:     [Ar]4s²3d⁶

Fe²⁺: [Ar]3d⁶

When removing electrons from a transition metal ion, you remove the s electrons first.

(B) Cl

Cl: [Ne]3s²3p⁵

(C) K⁺

K:   [Ar]4s

K⁺: [Ar]

(D) Cs

Cs: [Xe]6s

(E) Hg⁺

Hg:   [Xe]6s²4f¹⁴5d¹⁰

Hg⁺: [Xe]6s4f¹⁴5d¹⁰

2. K⁺ has a noble gas configuration

3. Hg⁺ has electrons in f orbitals.

4. The electron configuration of Au is [Xe]6s4f¹⁴5d¹⁰, not [Xe]6s²4f¹⁴5d⁹, because a filled d subshell is more stable than a filled s subshell.

Thus, Hg⁺ is isoelectronic with Au.

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rjkz [21]

Answer:

                       1.66 × 10⁻¹⁸  Moles

Explanation:

                     As we know one mole of any substance contains 6.022 × 10²³ particles (atoms, ions, molecules or formula units). This number is also called as Avogadro's Number.

The relation between Moles, Number of Atoms and Avogadro's Number is given as,

             Number of Moles  =  Number of Atoms ÷ 6.022 × 10²³ Atoms/mol

Putting values,

              Number of Moles  =  1.0 × 10⁶ Atoms ÷ 6.022 × 10²³ Atoms/mol

              Number of Moles  =  1.66 × 10⁻¹⁸  Moles

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3 years ago
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the chemical compound C2F4 is used to make PTEE (Teflon). How manyC2F4 molecules are in 485 kilograms of this material?
monitta

Answer:

molecules=2.92x10^{27}moleculesC_2F_4

Explanation:

Hello,

In this case, we use the Avogadro's number to compute the molecules of C2F4 whose molar mass is 100 g/mol contained in a 485-kg sample as shown below:

molecules=485kgC_2F_4*\frac{1000gC_2F_4}{1kgC_2F_4} *\frac{1molC_2F_4}{100gC_2F_4}*\frac{6.022x10^{23}molecules C_2F_4}{1molC_2F_4}  \\\\molecules=2.92x10^{27}moleculesC_2F_4

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