8.88 A major challenge in implementing the "hydrogen econ-omy" is finding a safe, lightweight, and compact way of stor-ing hydrogen for use as a fuel. The hydrides of light metalsare attractive for hydrogen storage because they can store ahigh weight percentage of hydrogen in a small volumeexample, NaAlH4 can release 5.6% of its mass as H2 upondecomposing to NaH(s), Al(s), and H2(g). NaAlH4 pos-sesses both covalent bonds, which hold polyatomic anionstogether, and ionic bonds. (a) Write a balanced equationfor the decomposition of NaAlH4. (b) Which element inNAAIH& is the most electronegative? Which one is the leastelectronegative? (c) Based on electronegativity differences,predict the identity of the polyatomic anion. Draw a Lewisstructure for this ion. (d) What is the formal charge on hy-drogen in the polyatomic ion?

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Asked Oct 16, 2019
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8.88 A major challenge in implementing the "hydrogen econ-
omy" is finding a safe, lightweight, and compact way of stor-
ing hydrogen for use as a fuel. The hydrides of light metals
are attractive for hydrogen storage because they can store a
high weight percentage of hydrogen in a small volume
example, NaAlH4 can release 5.6% of its mass as H2 upon
decomposing to NaH(s), Al(s), and H2(g). NaAlH4 pos-
sesses both covalent bonds, which hold polyatomic anions
together, and ionic bonds. (a) Write a balanced equation
for the decomposition of NaAlH4. (b) Which element in
NAAIH& is the most electronegative? Which one is the least
electronegative? (c) Based on electronegativity differences,
predict the identity of the polyatomic anion. Draw a Lewis
structure for this ion. (d) What is the formal charge on hy-
drogen in the polyatomic ion?
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8.88 A major challenge in implementing the "hydrogen econ- omy" is finding a safe, lightweight, and compact way of stor- ing hydrogen for use as a fuel. The hydrides of light metals are attractive for hydrogen storage because they can store a high weight percentage of hydrogen in a small volume example, NaAlH4 can release 5.6% of its mass as H2 upon decomposing to NaH(s), Al(s), and H2(g). NaAlH4 pos- sesses both covalent bonds, which hold polyatomic anions together, and ionic bonds. (a) Write a balanced equation for the decomposition of NaAlH4. (b) Which element in NAAIH& is the most electronegative? Which one is the least electronegative? (c) Based on electronegativity differences, predict the identity of the polyatomic anion. Draw a Lewis structure for this ion. (d) What is the formal charge on hy- drogen in the polyatomic ion?

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Expert Answer

Step 1
  1. a) Balance chemical reaction for the decomposition of NaAlH

    Sodium aluminium hydride is a compound in which both covalent and ionic bond formed.

    It is used as a reducing agent in the chemical reaction.

    NaAlH4 on heating it decomposes. It is represented by equation (1)

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2 NAAIH 4(s). 2 NaH (s)+2 Al(s)+ 3H2(g)

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Step 2
  1. b) The most electronegative element and least electronegative element in NaAlH4

In this different elements which are present, are Na, Al, and H.

Electronegative value for ‘Na’ is 0.9, for ‘Al’ is 1.6 and for ‘H’ is 2.1

Thus most electronegative atom is hydrogen and the least electronegative atom is sodium.

 

Step 3
  1. c) prediction of the identity of polyatomic anion and lewis structure of this ion.

since in NaAlH4, sodium (Na) metal act as cation and aluminium hydride(AlH4) act as an anion.

Sin...

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H AI lHy iom Lewis stouduse A

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