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2 years ago

A sample of gas X occupies 10 mº at a pressure of 120 kPa.

Chemistry

1 answer:

Mashutka [201]2 years ago

5 0

Answer:

The new pressure of the gas comes out to be 400 KPa.

Explanation:

Initial volume of gas = V = $10\textrm{ m}^{3}$

Initial pressure of gas = P = 120 KPa

Final volume of gas = V' = $3\textrm{ m}^{3}$

Assuming temperature to be kept constant.

Assuming final pressure of the gas to be P' KPa

$PV = P'V' \\120\textrm{ KPa}\times 10\textrm{ m}^{3} = \textrm{P'}\times 3\textrm{ m}^{3} \\\textrm{P'} = 400\textrm{ KPa}$

New pressure of gas = 400 KPa

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2 years ago

Given the following equation: 2 C4H10 13 O2 > 8 CO2 10 H20 + How many grams of CO2 are produced if 12.4 grams of C4H10 reacts

ahrayia [7]

Answer : The mass of $CO_2$ produced will be, 37.488 grams.

Explanation : Given,

Mass of $C_4H_{10}$ = 12.4 g

Mass of $O_2$ = 56.9 g

Molar mass of $C_4H_{10}$ = 58 g/mole

Molar mass of $O_2$ = 32 g/mole

Molar mass of $CO_2$ = 44 g/mole

First we have to calculate the moles of $C_4H_{10}$ and $O_2$ .

$\text{Moles of }C_4H_{10}=\frac{\text{Mass of }C_4H_{10}}{\text{Molar mass of }C_4H_{10}}=\frac{12.4g}{58g/mole}=0.213moles$

$\text{Moles of }O_2=\frac{\text{Mass of }O_2}{\text{Molar mass of }O_2}=\frac{56.9g}{32g/mole}=1.778moles$

Now we have to calculate the limiting and excess reagent.

The balanced chemical reaction is,

$2C_4H_{10}+13O_2\rightarrow 8CO_2+10H_2O$

From the balanced reaction we conclude that

As, 2 moles of $C_4H_{10}$ react with 13 mole of $O_2$

So, 0.213 moles of $C_4H_{10}$ react with $\frac{13}{2}\times 0.213=1.385$ moles of $O_2$

From this we conclude that, $O_2$ is an excess reagent because the given moles are greater than the required moles and $C_4H_{10}$ is a limiting reagent and it limits the formation of product.

Now we have to calculate the moles of $CO_2$ .

As, 2 moles of $C_4H_{10}$ react to give 8 moles of $CO_2$

So, 0.213 moles of $C_4H_{10}$ react to give $\frac{8}{2}\times 0.213=0.852$ moles of $CO_2$

Now we have to calculate the mass of $CO_2$ .

$\text{Mass of }CO_2=\text{Moles of }CO_2\times \text{Molar mass of }CO_2$

$\text{Mass of }CO_2=(0.852mole)\times (44g/mole)=37.488g$

Therefore, the mass of $CO_2$ produced will be, 37.488 grams.

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3 years ago