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Yuri [45]
3 years ago
12

What mass of hydrogen is produced from 5.71 mol of aluminum?

Chemistry
1 answer:
nasty-shy [4]3 years ago
5 0

Answer:

3.03 g

Explanation:

The first thing to do here is figure out the chemical formula for aluminium hydroxide.

Aluminium is located in group

13

of the periodic table, and forms

3

+

cations,

Al

3

+

. The hydroxide anion,

OH

−

, carries a

1

−

charge, which means that a formula unit of aluminium hydroxide will look like this

[

Al

3

+

]

+

3

[

OH

−

]

→

Al

(

OH

)

3

Now, you can figure out the mass of hydrogen present in

1

mole of aluminium hydroxide by first determining how many moles if hydrogen you get in

1

mole of aluminium hydroxide.

Since

1

mole of aluminium hydroxide contains

3

moles of hydroxide anions, which in turn contain

1

mole of hydrogen each, you can say that you will have

1 mole Al

(

OH

)

3

→

3

a

moles OH

−

→

3

a

moles H

The problem tells you that the molar mass of hydrogen is equal to

1.01 g mol

−

1

. This means that

1

mole of hydrogen has a mass of

1.01 g

.

You can thus say that one mole of aluminium hydroxide contains

3

moles H

⋅

1.01 g

1

mole H

=

a

a

3.03 g H

a

a

∣

∣

I'll leave the answer rounded to three sig figs. Btw my sister calculated this oof

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In each row check off the boxes that apply to the highlighted reactant. reaction The highlighted reactant acts as a... (check al
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The given question is incomplete. The complete question is :

In each row check off the boxes that apply to the underlined reactant. The underlined reactant acts as a... (check all that apply)

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here underlined is HCH_3CO_2

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B. Brønsted-Lowry base

C. Lewis acid

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Here underlined is NH_3

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2. Lewis base

3. Brønsted-Lowry base

Explanation:

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According to the Lewis concept, an acid is defined as a substance that accepts electron pairs and base is defined as a substance which donates electron pairs.

1.  HCH_3CO_2(aq)+NH_3(aq)\rightarrow CH_3CO^{2-}(aq)+NH_4^+aq)

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2. BH_3(aq)+NH_3(aq)\rightarrow BH_3NH_3(aq)

As NH_3 contains a lone pair of electron on nitrogen , it can easily donate electrons to BH_3 and act as lewi base.

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As C_2H_5NH_2(aq) is accepting a proton , it acts as a bronsted base.

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