3 years ago

What is the density of helium

Chemistry

2 answers:

Contact [7]3 years ago

8 0

The density of helium is 10 ^-3g.cm^-3

ollegr [7]3 years ago

6 0

Answer:

The density of helium..........

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This element is often used to block out dangerous radiation.

ella [17]

Lead is often used to block out radiation

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4 years ago

What acceleration does the force of earths gravity produce?

valentina_108 [34]

(a) 9.8 m/s/s

This never changes.

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3 years ago

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A regular 3-d spatial arrangement of points that correspond to atom positions within a crystal is called_______?

Soloha48 [4]

Answer:

Explanation:

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2 years ago

in a sample of silcon 92.21% of the atoms have a mass of 27.98 amu, 4.70% have a mass of 28.98 amu and 3.09% have a mass of 29.9

oksano4ka [1.4K]

Answer: 28.1 amu

Explanation:

Mass of isotope 1 = 27.98 amu

% abundance of isotope 1 = 92.21% = $\frac{92.21}{100}=0.9221$

Mass of isotope 2 = 28.98 amu

% abundance of isotope 2 = 4.70% = $\frac{4.70}{100}=0.047$

Mass of isotope 3 = 29.97 amu

% abundance of isotope 2 = 3.09% = $\frac{3.09}{100}=0.0309$

Formula used for average atomic mass of an element :

$\text{ Average atomic mass of an element}=\sum(\text{atomic mass of an isotopes}\times {{\text { fractional abundance}})$

$A=\sum[(27.98 )\times 0.922+(28.98)\times 0.047+(29.97)\times 0.0309]$

$A=28.1amu$

Therefore, the average atomic mass of silicon is 28.1 amu

5 0

3 years ago

600. ml of a gas at 50.0 kPa is compressed, at constant temperature, until its volume becomes 200. ml. What is the new pressure

Flura [38]

Answer:

<h3>The answer is 150 kPa</h3>

Explanation:

The new pressure can be found by using the formula for Boyle's law which is

$P_1V_1 = P_2V_2$

Since we are finding the new pressure

$P_2 = \frac{P_1V_1}{V_2} \\$

From the question we have

$P_2 = \frac{600 \times 50000}{200} = \frac{30000000}{200} \\ = 150000$

We have the final answer as

Hope this helps you

6 0

3 years ago