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bija089 [108]
3 years ago
7

How are elements that are gases at room temperature designated in the periodic table

Chemistry
1 answer:
Ira Lisetskai [31]3 years ago
4 0

5= Elemental hydrogen, nitrogen, oxygen, fluorine and chlorine are all gases at room temperature,

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One mole of which substance contains a total of 6.02 x 1023 atoms? (I need help please.)
Korolek [52]

Answer:

Oxygen

Explanation:

One mole of atoms of oxygen has a mass of 16 g, as 16 is the atomic weight of oxygen, and contains 6.02 X 1023 atoms of oxygen.

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The sum of two numbers is 54 one exceed the other by 14 find the number​
Aneli [31]

Answer:

x=34

y=20

Explanation:

let the first number be 'x'

let the second number be 'y'

Equation 1:-

x + y = 54

Equation 2:-

x = y + 14  (Since one exceeds the other by 14)

Substituting Equation 2 in Equation 1:-

(y + 14) + y = 54

=> y + 14 + y = 54

=> 2y + 14 = 54

=> 2y = 54 - 14

=> 2y = 40

=> y = 40/2

=> y = 20

Now in Equation 1:-

x + y = 54

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x + 20 = 54

x = 54 - 20

x = 34

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3 years ago
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