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Ugo [173]
3 years ago
5

A ballon is filled with 30.0g of helium gas. What volume can be filled to a pressure of 1.15 atm if the temperature is 20.0°C?

Chemistry
1 answer:
Nostrana [21]3 years ago
5 0

Answer:

156.7mL

Explanation:

First we need to find the number of mole of He. This can be achieved by doing the following:

Mass of He from the question = 30g

Molar Mass of He = 4g/mol

Number of mole = Mass /Molar Mass

Number of mole of He = 30/4

Number of mole of He = 7.5moles

Now, we can obtain the volume as follows:

P = 1.15 atm

T = 20°C = 20 + 273 = 293K

R = 0.082atm.L/Kmol

n = 7.5moles

V =?

Recall: PV = nRT

V = nRT/P

V = (7.5 x 0.082 x 293)/1.15

V = 156.7mL

Therefore, the volume that can be filled to that pressure is 156.7mL

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A sodium hydroxide solution is made by mixing 8.70 g NaOH with 100 g of water. The resulting solution has a density of 1.087 g/m
Ahat [919]

Answer:

Mass fraction = 0.08004

Mole fraction = 0.0377

Explanation:

Given, Mass of NaOH = 8.70 g

Mass of solution = 8.70 + 100 g = 108.70 g

Mass\ fraction\ of\ NaOH=\frac {8.70}{108.70} = 0.08004

Molar mass of NaOH = 39.997 g/mol

The formula for the calculation of moles is shown below:

moles = \frac{Mass\ taken}{Molar\ mass}

Thus,

Moles= \frac{8.70\ g}{39.997\ g/mol}

Moles\ of\ NaOH= 0.2175\ mol

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Molar mass of water = 18.0153 g/mol

The formula for the calculation of moles is shown below:

moles = \frac{Mass\ taken}{Molar\ mass}

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Moles= \frac{100\ g}{18.0153\ g/mol}

Moles\ of\ water= 5.5508\ mol

So, according to definition of mole fraction:

Mole\ fraction\ of\ NaOH=\frac {n_{NaOH}}{n_{NaOH}+n_{water}}

Mole\ fraction\ of\ NaOH=\frac {0.2175}{0.2175+5.5508}=0.0377

3 0
3 years ago
Write the name and molecular formula of an organic compounds having its name suffixed with -ol and having 2 carbon atoms in the
777dan777 [17]

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CH₃-CH₂-OH → CH₂=CH₂ + H₂O

Learn more about:

sulphuric acid

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