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Vlad [161]
3 years ago
5

A student has a sample of aluminum that has a mass of 27 g and a volume of 10cm3. What is the density of aluminum​

Chemistry
1 answer:
Anestetic [448]3 years ago
6 0

Answer:

270 g/cm^3

Explanation:

d = mv

d = 27 g × 10cm^3

d = 270 g/cm^3

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A sample of TNT, C7H5N3O6 , has 8.94 × 1021 nitrogen atoms. How many hydrogen atoms are there in this sample of TNT?
Bess [88]

Answer:

1.49×10²² atoms of H are contained in the sample

Explanation:

TNT → C₇H₅N₃O₆

1 mol of this has 7 moles of C, 5 moles of H, 3 moles of N and 6 moles of O

Let's determine the mass of TNT.

Molar mass is = 227 g/mol

As 1 mol has (6.02×10²³) NA atoms, how many moles are 8.94×10²¹ atoms.

8.94×10²¹ atoms / NA = 0.0148 moles

So this would be the rule of three to determine the mass of TNT

3 moles of N are in 227 g of compound

0.0148 moles of N are contained in (0.0148 .227) / 3 = 1.12 g

Now we can work with the hydrogen.

227 grams of TNT contain 5 moles of H

1.12 grams of TNT would contain (1.12 .5) / 227 = 0.0247 moles

Finally let's convert this moles to atoms:

0.0247 mol . 6.02×10²³ atoms / 1 mol = 1.49×10²² atoms

8 0
3 years ago
You mix a blue and a clear liquid together and they turn bright green. Has a chemical reaction occurred?
Margarita [4]
Yes because color change is a sign of a chemical reaction.
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Explain the difference between molecule and compound
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Answer:
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Good luck !
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2 years ago
Which resources are significantly polluted by heavy metals like mercury?
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tia_tia [17]

Answer:

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Explanation:

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