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3 years ago

Explain why the quantum number set (2, 1, -2, -1/2) is not possible for an electron in an atom.

1 answer:

3 0

" n " is called principle quantum number. Here , n = 2 which means , number of shells = 2 .: l ( azimuthal quantum no: ) / ( n - 1 ) = 0 , 1 & m ( magnetic quantum number ) = -1 , 0 , +1 ..... s ( spin quantum number ) = ± 1/2 ..... Coming to this question , here n = 2 .... l = 1 ( possible ) ..... ml = -2 [ not possible , because it can only be a number from this set ( -1 , 0 , +1 ) ] ..... .: this set is not possible

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The standard cell potential (E°cell) for the reaction below is +0.63 V. The cell potential for this reaction is __________V when

Elodia [21]

Answer: The cell potential of the above reaction is 0.52 V

Explanation:

The given chemical equation follows:

$Pb^{2+}(aq.)+Zn(s)\rightarrow Zn^{2+}(aq.)+Pb(s)$

Oxidation half reaction: $Zn(s)\rightarrow Zn^{2+}(aq.)+2e^-$

Reduction half reaction: $Pb^{2+}(aq.)+2e^-\rightarrow Pb(s)$

To calculate the EMF of the cell, we use the Nernst equation, which is:

$E_{cell}=E^o_{cell}-\frac{0.059}{n}\log \frac{[Zn^{2+}]}{[Pb^{2+}]}$

where,

$E_{cell}$ = electrode potential of the cell = ? V

$E^o_{cell}$ = standard electrode potential of the cell = 0.63 V

n = number of electrons exchanged = 2

$[Zn^{2+}]=1.0M$

$[Pb^{2+}]=2.0\times 10^{-4}M$

Putting values in above equation, we get:

$E_{cell}=0.63-\frac{0.059}{2}\times \log(\frac{1.0}{2.0\times 10^{-4}})\\\\E_{cell}=0.52V$

Hence, the cell potential of the above reaction is 0.52 V

7 0

3 years ago

Which property of the isotopes must be different?

Inessa [10]

Answer:

the mass number, trust me

8 0

3 years ago

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What is a solution? Are all mixtures solutions? Are all solutions mixtures?

olga2289 [7]

A solution is when you have two or more substances (a solvent and solutes) mixed together, and you can't tell its components apart just by looking at it or under a microscope (it's homogeneous). All solutions are mixtures, but not all mixtures are solutions because mixtures can be heterogeneous.

5 0

3 years ago

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NEED HELP ASAPPP What is the number of beryllium atoms in 78.0g of Be?

polet [3.4K]

Answer: number of atoms is 5.21 · 10^24

Explanation: Atomic mass of Be is 9.012 g/mol.

Number of moles n = m/M = 78.0 g / 9.012 g/mol =

Multiply this with Avogadro number Na = 6.022*10^23 1/mol

4 0

3 years ago

if 11.74 liters of gas at STP are pumped into a basketball, how many moles of gas are in the basketball? assume the basketball w

ser-zykov [4K]

Answer:

0.52 mol

Explanation:

Using the general gas equation formula:

PV = nRT

Where;

P = pressure (atm)

V = volume (Liters)

n = number of moles (mol)

R = gas law constant (0.0821 Latm/molK)

T = temperature (K)

At STP (standard temperature and pressure), temperature of a gas is 273K, while its pressure is 1 atm

Using PV = nRT

n = PV/RT

n = (1 × 11.74) ÷ (0.0821 × 273)

n = 11.74 ÷ 22.41

n = 0.52 mol

There are 0.52 moles in the basketball

6 0

3 years ago