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3 years ago

11) What is the volume of 4.92 grams of hydrogen gas at STP? (Show the work using dimensional analysis)

Chemistry

1 answer:

lorasvet [3.4K]3 years ago

4 0

Answer:

The volume of 4.92 grams of hydrogen gas at STP is 9.105 litter.

Explanation:

We know that, the molecular weight of hydrogen gas $(H_{2} )$ = $1\times 2 = 2$ .

Moles of hydrogen gas = $\frac{weight}{molecular weight} = \frac{4.92}{2} = 2.46$ moles.

At STP, 1 mole of hydrogen gas = occupies 22.4 litter

So, 2.46 mole of hydrogen gas = occupies $\frac{22.4}{2.46} = 9.105$ litter.

Hence, the volume of 2.46 grams of hydrogen gas at STP is 9.105 litter.

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Answer:

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Explanation:

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3 years ago

Draw the best Lewis structure for CH 3 -1. What is the formal charge on the C?

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Answer : The formal charge on the C is, (-1) charge.

Explanation :

Lewis-dot structure : It shows the bonding between the atoms of a molecule and it also shows the unpaired electrons present in the molecule.

In the Lewis-dot structure the valance electrons are shown by 'dot'.

The given molecule is, $CH_3^{-1}$

As we know that carbon has '4' valence electrons and hydrogen has '1' valence electron.

Therefore, the total number of valence electrons in $CH_3^{-1}$ = 4 + 3(1) + 1 = 8

According to Lewis-dot structure, there are 6 number of bonding electrons and 2 number of non-bonding electrons.

Now we have to determine the formal charge on carbon atom.

Formula for formal charge :

$\text{Formal charge}=\text{Valence electrons}-\text{Non-bonding electrons}-\frac{\text{Bonding electrons}}{2}$

$\text{Formal charge on C}=4-2-\frac{6}{2}=-1$

The formal charge on the C is, (-1) charge.

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Explanation:

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