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Rashid [163]
3 years ago
6

Which of the following elements can form diatomic molecules held together by triple covalent bonds?

Chemistry
2 answers:
Art [367]3 years ago
6 0
Nitrogen can form a diatomic molecule held together by triple bonds.
ELEN [110]3 years ago
3 0

Answer;

Nitrogen

Explanation;

-Nitrogen is the element that may form diatomic molecules held together by triple covalent bonds.

-Nitrogen is an element that occurs as a diatomic molecule in its gaseous state. This element only exists in the diatomic form with triple bonds between the two atoms. Due to is small size and being non polar, it lacks inter-molecular forces and thus it is gaseous in nature.

-Other elements that are diatomic in their gaseous states includes; hydrogen, oxygen, chlorine, bromine, iodine and fluorine.


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If the pka of hcho2 is 3.74 and the ph of an hcho2/nacho2 solution is 3.89, it means that
Andrei [34K]

Hi, the question has some missing part. The complete question should be " If the pK_{a} of HCHO_{2} is 3.74 and the pH of an HCHO_{2}/NaCHO_{2} solution is 3.89, it means that -

(a) [HCHO_{2}]=[NaCHO_{2}]

(b) [HCHO_{2}]> [NaCHO_{2}]

(c) [HCHO_{2}]<  [NaCHO_{2}]

Which of the options are true?"

Answer: Option (c) is true.

Explanation:

HCHO_{2}/NaCHO_{2} is an weak acid-conjugate base buffer. Hence, in accordance with Henderson-Hasselbalch equation-

                  pH=pK_{a}(HCHO_{2})+log(\frac{[CHO_{2}^{-}]}{[HCHO_{2}]})

Here, pH = 3.89, pK_{a} of HCHO_{2} = 3.74

So, 3.89=3.74+log(\frac{[CHO_{2}^{-}]}{[HCHO_{2}]})

or, \frac{[CHO_{2}^{-}]}{[HCHO_{2}]} = 1.41 (>1)

So,  [CHO_{2}^{-}]> [HCHO_{2}]

or, [NaCHO_{2}]> [HCHO_{2}]

Hence, option (c) is correct.

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