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2 years ago

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

Chemistry

1 answer:

nasty-shy [4]2 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

of the periodic table, and forms

cations,

. The hydroxide anion,

−

, carries a

−

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

[

]

[

−

]

→

(

)

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

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

mole of aluminium hydroxide.

Since

mole of aluminium hydroxide contains

moles of hydroxide anions, which in turn contain

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

1 mole Al

(

)

→

moles OH

−

→

moles H

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

1.01 g mol

−

. This means that

mole of hydrogen has a mass of

1.01 g

You can thus say that one mole of aluminium hydroxide contains

moles H

⋅

1.01 g

mole H

3.03 g H

∣

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

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