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timurjin [86]
3 years ago
13

Plz help ......Na+ has completely filled k and L shells . explain​

Chemistry
1 answer:
inessss [21]3 years ago
5 0

Explanation:

Na represents the neutral element; Sodium. Because of it's atomic number of 11, It has 11 electrons.

Na+ on the other hand represents a cation. The sodium ion has lost an electron, hence the total number of electrons it has = 10.

The K and L shells each have maximum number of electrons they can accommodate. This is given by the formular; 2n^2

K shell = 2 (1)^2 = 2 electrons

L shell = 2 (2)^2 = 8 electrons

Seeing as Na+ has 10 electrons, It completely filled the K and L shells ( 2 + 8 = 10 )

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N76 [4]
You have already gotten the balanced equation. And the ratio of mol number of reactants and production is the ratio of coefficient. So there is 6.4/8*11=8.8 mol oxygen needed. The mass is 8.8*32=281.6 g.
6 0
3 years ago
Acetone is one of the most important solvents in organic chemistry. It is used to dissolve everything from fats and waxes to air
Yanka [14]

Answer: a. 79.6 s

b. 44.3 s

c. 191 s

Explanation:

Expression for rate law for first order kinetics is given by:

t=\frac{2.303}{k}\log\frac{a}{a-x}

where,

k = rate constant  

t = age of sample

a = let initial amount of the reactant  

a - x = amount left after decay process  

a) for completion of half life:

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

t_{\frac{1}{2}}=\frac{0.693}{k}

t_{\frac{1}{2}}=\frac{0.693}{8.7\times 10^{-3}s^{-1}}=79.6s

b) for completion of 32% of reaction  

t=\frac{2.303}{k}\log\frac{100}{100-32}

t=\frac{2.303}{8.7\times 10^{-3}}\log\frac{100}{68}

t=44.3s

c) for completion of 81 % of reaction  

t=\frac{2.303}{k}\log\frac{100}{100-81}

t=\frac{2.303}{8.7\times 10^{-3}}\log\frac{100}{19}

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4 0
2 years ago
Identify the effect of increasing acidity on the solubility of the given compounds.
Ilia_Sergeevich [38]

All the given compounds are basic on acidifying their solubility increases.

<u>Explanation:</u>

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3 years ago
What is the mass in grams of 2.00 10 5 atoms of naturally occurring neon
lesantik [10]

Answer:

2.00X10^5 x 20gNe/6.02x10^23=6.46x10^-18 but books answer is 797.

Explanation:

3 0
2 years ago
What is the velocity of a 0.5-kg ball<br> that has a momentum of 3 kg.m/s?
maria [59]

Answer:

6m/s

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