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3 years ago

Which event is most likely an example of a chemical reaction

Chemistry

1 answer:

Inessa [10]3 years ago

7 0

Explanation:

One example of a chemical reaction is the rusting of a steel garbage can. That rusting happens because the iron (Fe) in the metal combines with oxygen (O2) in the atmosphere. Chemical bonds are created and destroyed to finally make iron oxide (Fe2O3).

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Calculate the number of atoms per cubic meter in aluminum. The density and atomic weight of aluminum are 2.70 g/cm3 and 26.98 g/

olya-2409 [2.1K]

Answer:

The number of Aluminium atoms present in per cubic meter is $N=6.02\times 10^{28}\ atoms/m^3$

Explanation:

Given the density of Aluminium $(\rho )$ is $2.70\ g/cm^3$

And the atomic weight of Aluminium $(A_{Al})$ is $26.98\ g/mol$

Also, the Avogadro's number $(N_A)$ is $6.023\times 10^{23}\ atoms/mol$

We need to find the number of atoms per cubic meter $(N)$

$N=\frac{\rho N_{A}}{A_{Al}}$

Plug the given values in the formula we get,

$N=\frac{2.70\times 6.022\times 10^{23}}{26.98}\\ \\N=0.602\times 10^{23}\ atoms/cm^3\\N=6.02\times 10^{22}\ atoms/cm^3\\N=6.02\times 10^{22}\times10^6\ atoms/m^3$

$N=6.02\times 10^{28}\ atoms/m^3$

So, the number of Aluminium atoms present in per cubic meter is $N=6.02\times 10^{28}$

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4 years ago

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you rent a car in Germany with a gas mileage rating of 12.8km/L. What is its rating in miles per gallon?

Oksi-84 [34.3K]

so one liter is about 2. something gallons so at 12.8 km/l you would get about 30 mpg which is insane but yeah

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4 years ago

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Hi! ❤️ , im looking for some help here. ill give brainliest if able to.

dexar [7]

A student builds a model of a race car. The scale is 1:15. In the scale model, the car is 8 cm tall. How tall is the actual car?

<h2>Answers:</h2>

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2 years ago

What can be expected to occur as climate change continues on earth?

Zanzabum

<span>the earth's temperature will continue to rise which will increase the amount of sea ice that is melting

hope this helped</span>

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4 years ago

How many grams of phosphorus are in a sample of Ca3(PO4)2 that contains 50.0 g of calcium? Answer: ________ grams of phosphorus.

wel

<u>Answer:</u> The mass of phosphorus that is present for given amount of calcium is 28.53 g.

<u>Explanation:</u>

We are given:

Mass of calcium = 50 grams

The chemical formula of calcium phosphate is $Ca_3(PO_4)_2$

Molar mass of calcium = 40 g/mol

Molar mass of phosphorus = 31 g/mol

In 1 mole of calcium phosphate, 120 grams of calcium is combining with 62 grams of phosphorus.

So, 50 grams of calcium will combine with = $\frac{62}{120}\times 50=28.53g$ of phosphorus.

Hence, the mass of phosphorus that is present for given amount of calcium is 28.53 g.

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3 years ago