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2 years ago

A cylinder of nitrogen gas (N2) weighs 550 grams. How many moles of nitrogen are present in the cylinder?

2 answers:

5 0

Molar mass N2 = 14 x 2 => 28.0 g/mol

1 mole N2 ------------- 28.0 g
? moles N2 ----------- 550 g

550 x 1 / 28.0 => 19.64 moles of N2

Charra [1.4K]2 years ago

4 0

Answer:

Moles of nitrogen present in the cylinder = 19.64 mol

Explanation:

Given:

Weight of $N_2$ = 550 g

Formula for the calculation of moles is:

$mol=\frac{Weight\ in\ g}{Molecular\ mass}$

Molecular mass of $N_2$ = 28 g/mol

$mol=\frac{550\ g}{28\ g/mol} = 19.64\ mol$

Moles of nitrogen present in the cylinder = 19.64 mol

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2 years ago

Alveolar air (a mixture of nitrogen, oxygen, and carbon dioxide) has a total pressure of 0.998 atm. If the partial pressure of o

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Answer:

The partial pressure of carbon dioxide is 22.8 mmHg

Explanation:

Dalton's Law is a gas law that relates the partial pressures of the gases in a mixture. This law says that the pressure of a gas mixture is equal to the sum of the partial pressures of all the gases present.

In this case:

Ptotal=Pnitrogen + Poxygen + Pcarbondioxide

You know that:

Ptotal= 0.998 atm
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Replacing:

0.998 atm=0.770 atm + 0.198 atm + Pcarbondioxide

Solving:

Pcarbondioxide= 0.998 atm - 0.770 atm - 0.198 atm

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2 years ago

Draw a structure containing only carbon and hydrogen that is a stable alkyne of five carbons containing a ring.

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Answer:

Ethynylcyclopropane is the stable isomer for given alkyne.

Explanation:

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CₙH₂ₙ₋₂

Putting value on n = 5,

C₅H₂.₅₋₂

C₅H₈

Also, the statement states that the compound contains one ring therefore, we will subtract 2 hydrogen atoms from the above formula i.e.

C₅H₈ ------------(-2 H) ----------> C₅H₆

Hence, the molecular formula for given compound is C₅H₆

Below, 4 different isomers with molecular formula C₅H₆ are attached.

The first compound i.e. ethynylcyclopropane is stable. As we know that alkynes are sp hybridized. The angle between C-C-H in alkynes is 180°. Hence, in this structure it can be seen that the alkyne part is linear and also the cyclopropane part is a well known moiety.

Compounds 3-ethylcycloprop-1-yne, cyclopentyne and 3-methylcyclobut-1-yne are highly unstable. The main reason for the instability is the presence of triple bond in three, five and four membered ring. As the alkynes are linear but the C-C-H bond in these compound is less than 180° which will make them highly unstable.