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Volgvan
3 years ago
7

Hydrogen and chlorine atoms react to form a simple diatomic molecule in a 1:1 ration, that is HCl. The percent isotopic abundanc

es of the chlorine isotopes 35Cl and 37Cl are 75.77% and 24.23%, respectively. The percent isotopic abundances of the hydrogen isotopes are 2H and 3H are 0.015% and 0.001%. (a) How many different HCl molecules are possible, and what are their mass numbers
Chemistry
1 answer:
Sergio [31]3 years ago
6 0

Answer:

Four different HCl molecules are possible.

  1. Mass of ^{2}H^{35}Cl  = 37 amu
  2. Mass of ^{3}H^{35}Cl =  38 amu
  3. Mass of ^{2}H^{37}Cl = 39 amu
  4. Mass of ^{3}H^{37}Cl = 40 amu

Explanation:

Mass of 2-H isotope = 2 amu

Mass of 3-H isotope = 3 amu

Mass of 35-Cl isotope = 35 amu

Mass of 37-Cl isotope = 37 amu

Different HCl molecules possible are:

1) ^2H+^{35}Cl\rightarrow ^{2}H^{35}Cl

Mass of ^{2}H^{35}Cl = 2 amu + 35 amu = 37 amu

2)  ^3H+^{35}Cl\rightarrow ^{3}H^{35}Cl

Mass of ^{3}H^{35}Cl = 3 amu + 35 amu = 38 amu

3) ^2H+^{37}Cl\rightarrow ^{2}H^{37}Cl

Mass of ^{2}H^{37}Cl = 2 amu + 37 amu = 39 amu

4) ^3H+^{37}Cl\rightarrow ^{3}H^{37}Cl

Mass of ^{3}H^{37}Cl = 3 amu + 37 amu = 40 amu

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Stolb23 [73]

Answer:

a) in pure water:

⇒ S (25°C) Ni(OH)2 = 2.0 E-5 M

b)  in 0.013 M NaOH:

⇒ S = 9.467 E-11 M

Explanation:

a) Ni(OH)2 ↔ Ni2+  +  2OH-

  S                S               2S

⇒ Ksp = [ Ni2+ ] * [ OH- ]² = 1.6 E-14.....Ksp value comes from the literature

⇒  Ksp = S * 2S² = 1.6 E-14

⇒ 2S³ = 1.6 E-14

⇒ S = ∛( 1.6 E-14 / 2 )

⇒ S = 2.0 E-5 M

b)  NaOH ↔   Na+  +  OH-

 0.0130 M    0.013     0.013

Ni(OH)2 ↔  Ni2+   +    2OH-

   S               S          2S + 0.0130

⇒ Ksp = [ Ni2+ ] * [ OH- ]²

⇒ Ksp = S * (2S + 0.0130 )² = 1.6 E-14

Due to the small value of the Ksp it can be assumed that "s" is a very small number, so "2s" can be neglected when added to 0.0130.

⇒ 1.6 E-14 = S * ( 0.0130 )²

⇒ S = 9.467 E-11 M

4 0
3 years ago
How do the number of electrons in the second energy shell of an atom change going across period 2 in the periodic table?
KiRa [710]

How do the number of electrons in the second energy shell of an atom change going across period 2 in the periodic table?

The answer is: A. The number of electrons increases by 1, from left to right.

B is wrong because atoms in period 2 DO have a second energy shell. For C, the number of electrons in the second energy shell is NOT full. For D, it is wrong to state that the number of electrons increases by 1, from right to left.

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4 years ago
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Answer:

See explanation

Explanation:

Now , we have the equation of the reaction as;

2H2S(g) + 302(g)------->2SO2(g) + 2H2O(g)

This equation shows that SO2 gas is produced in the process. Let us recall that this same SO2 gas is the anhydride of H2SO4. This means that it can dissolve in water to form H2SO4

So, when SO2 dissolve in rain droplets, then H2SO4 is formed thereby lowering the pH of rain water. This is acid rain.

4 0
3 years ago
When a teacher dilutes 50 mL of 2.0 M NaOH to 0.50 M, what volume of NaOH results?
JulijaS [17]

Answer:

= 200 mL

Explanation:

Using the dilution formula;

M1V1 = M2V2 ;

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M1 = 2.0 M

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3 years ago
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hichkok12 [17]

Answer: The electron configuration of carbon atom is written as 1s²,2s², 2p².

Explanation:

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L: 2n² = 2× 2² = 8

These shells are further subdivided into subshells. There are 4 subshells, s, p, d, and f. Each subshell can hold a different number of electrons.

This electron configuration of carbon can be written as 1s² 2s² 2p² where 1s, 2s, and 2p are the occupied subshells, and the superscript "2" is the number of electrons in each of these subshells.

4 0
3 years ago
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