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Tju [1.3M]
3 years ago
10

What is the density of a substance that has a mass of 453g and a volume of 224mL?

Chemistry
1 answer:
Savatey [412]3 years ago
7 0
453 divided by 224
density is roughly 2.02 g per ml
as a ml is 1 cm3 density is 2.02 grams per centimeter cubed
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CO2 + H2O + C6H12O6 +02
andrew11 [14]

Answer:

6CO2+6H2O->C6H12O6+6O2

Explanation:

CO2+H2O+C6H12O6+O2 This wrong when you write a formula. Don't savage the given question. caused it will affect the same answer.

It will write as this CO2+H20->C6H12O6+O2

So, Think what will you use the numbers in a side of chemical formula/name I am using the "eyes to eyes "caused you need to it properly. If you are not good at it use other method calculate each chemical name example. we have C=1,O=2 then, H=2,O=1 and they other side goes to the arrow is C=6 H=12O=6 ,O=2 I will think what number will make it balance for them and what is lucking see in the my answers what I add in the equation think carefully I didn't change or erase a number of them. Caused it is wrong if you do that. Thank you

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2 years ago
Calculate the wavelength, in nanometers, of the light emitted by a hydrogen atom when its electron falls from the n = 7 to the n
Gre4nikov [31]

Answer:

The wavelength of the light emitted by a hydrogen atom for the given transition is 2166 nm.

Explanation:

The energy of nth energy levels of the H atom is given as:

E_n = -2.18 \times 10^{-18} \times \frac{1}{n^2} J

Energy of the seventh energy level = E_7

E_7=-2.18 \times 10^{-18} \times \frac{1}{7^2} J

E_7=-2.18 \times 10^{-18} \times \frac{1}{7^2} J=-4.4490\times 10^{-20} J

Energy of the seventh energy level = E_4

E_4=-2.18 \times 10^{-18} \times \frac{1}{4^2} J

E_4=-2.18 \times 10^{-18} \times \frac{1}{16} J=-1.3625\times 10^{-19} J

Energy of the light emitted will be equal to the energy difference of the both levels.

E=E_7-E_4=-4.4490\times 10^{-20} J-(-1.3625\times 10^{-19} J)

E=9.176\times 10^{-20} J

Wavelength corresponding to energy E can be calculated by using Planck's equation:

E=\frac{hc}{\lambda }

\lambda =\frac{hc}{E}=\frac{6.626\times 10^{-34} Js\times 3\times 10^8 m/s}{9.176\times 10^{-20}  J}=2.166\times 10^{-6} m=2166 nm

The wavelength of the light emitted by a hydrogen atom for the given transition is 2166 nm.

8 0
2 years ago
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Paladinen [302]

Answer:

In crystal structure close packing is define as space efficient arrangement of constituent particles to form a crystal lattice.

Explanation:

closest packing

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In cubic closest packing arrangement, each sphere is surrounded by 12 other spheres on the other hand in case of hexagonal close packing, layers of spheres are packed so that spheres in alternating layers overlie one another.

unit cell for each closest packing arrangement

The hexagonal closest packed arrangement has a coordination number of 12 and it consists of 6 atoms per unit cell. The face centered cubic lattice has a coordination number of 12 and it consists of 4 atoms per unit cell. In case of body centered cubic crystal the coordination number is 8 and it consists of 2 atoms per unit cell.

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IBM and others are using copper instead of aluminum in the most powerful computer chips they manufacture. Because of copper's superior electrical conductivity, this technology enables conductor channel lengths and widths to be significantly reduced.

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