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solong [7]
3 years ago
11

Which of the following elements has properties different than the rest?

Chemistry
1 answer:
hjlf3 years ago
7 0
The correct answer is:  [D]:   "S"  (sulfur).
___________________________________________________
<u>Note</u>:  The other answer choices:

[A]:  "K" (potassium) ; 
[B]:  "Na" (sodium) ; 
[C]  "Mg" (magnesium) ; 
___________________________________________________
are all metals.
___________________________________________________
Answer choice: [D]:  "S" (sulfur) ; is NOT a metal; and may exist in gaseous form.
___________________________________________________
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The relative atomic mass of Chlorine is 35.45. Calculate the percentage abundance of the two isotopes of Chlorine, 35Cl and 37Cl
nata0808 [166]

Answer:

35Cl = 75.9 %

37Cl = 24.1 %

Explanation:

Step 1: Data given

The relative atomic mass of Chlorine = 35.45 amu

Mass of the isotopes:

35Cl = 34.96885269 amu

37Cl = 36.96590258 amu

Step 2: Calculate percentage abundance

35.45 = x*34.96885269 + y*36.96590258

x+y = 1  x = 1-y

35.45 = (1-y)*34.96885269 + y*36.96590258

35.45 = 34.96885269 - 34.96885269y +36.96590258y

0.48114731 = 1,99704989‬y

y = 0.241 = 24.1 %

35Cl = 34.96885269 amu = 75.9 %

37Cl = 36.96590258 amu = 24.1 %

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ammonia gas is used as refrigerant 0.474 atm. Pressure is required to change 2000 cm3 sample of ammonia initially at 1.0 atm to
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Answer: The pressure required is 0.474 atm

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The equation is,

{P_1V_1}={P_2V_2}

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Now put all the given values in the above equation, we get:

{1.0\times 2000}={P_2\times 4200}

P_2=0.474atm

The pressure required is 0.474 atm

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