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3 years ago

A certain material has a mass of 565 g while occupying 50 cm3 of space. what is this material?

1 answer:

5 0

<span>the material is Lead (Pb) .

you can get it by this steps:

1) first, we need to find the density:

when the denisty formula is = mass/volume.

and when we have the mass = 565 g, and volume is 50 Cm^3 . so, by

substitution: denisty = 565 g / 50Cm^3 = 11.3 g /Cm^3 . then after we get the

density of the material, we can look at the periodic table and serach for the

denisty which match the density result and find the element matching that

denisty. so our material here is lead as the denisty of lead is 11.34 g/Cm^3.</span>

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Imagine a planet that has a similar atmospheric pressure to Earth (760 mmHg) but different concentrations of gases in its atmosp

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Answer:

76 mmHg is the partial pressure of oxygen on this new planet.

Explanation:

Atmospheric pressure on air on earth = 760 mmHg

On an unknown planet :

Oxygen makes up 10% of the atmosphere.

The mole fraction of oxygen gas can be written as = $\chi_1=\frac{10}{100}=0.1$

Carbon dioxide makes up 15% of the atmosphere.

The mole fraction of carbon dioxide gas can be written as = $\chi_2=\frac{15}{100}=0.15$

Nitrogen makes up the remaining 75% of the atmosphere.

The mole fraction of nitrogen gas can be written as = $\chi_1=\frac{75}{100}=0.75$

Atmospheric pressure of air on unknown planet,p= 760 mmHg (given)

Partial pressure of gases can be calculated by the help o Dalton's law of partial pressure:

Partial pressure of oxygen gas :

$p_1=p\times \chi_1$

$p_1=760 mmHg\times 0.1=76 mmHg$

Partial pressure of carbon dioxide gas :

$p_2=p\times \chi_2$

$p_2=760 mmHg\times 0.15=114 mmHg$

Partial pressure of nitrogen gas :

$p_3=p\times \chi_3$

$p_3=760 mmHg\times 0.75=570 mmHg$

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3 years ago

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Explanation:

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Isotopes are variants atoms of the same element, having same number of atomic(proton) number but different number of neutrons and mass number.

Considering iron-60

The atomic number which also equals the number of protons for the element iron as can be seen on the periodic table is 26

The name iron-60 also tells us that this particlar isotope's mass number is 60.
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Other stable isotopes of Iron include ⁵⁴₂₆Fe , ⁵⁶₂₆Fe, ⁵⁷₂₆Fe and ⁵⁸₂₆Fe

See more here: brainly.com/question/11236150

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3 years ago

The table below gives the masses of two different subatomic particles found in an atom.

kap26 [50]

I think the subatomic particles that are paired with each of their corresponding name would be :
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hope this helps

7 0

3 years ago

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