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Scorpion4ik [409]
3 years ago
12

Antonio and his friend found a piece of metal which they want to identify. Here is what they figure out so far: Mass of this met

al is 20g Volume of this metal is 2.35cm3
Chemistry
1 answer:
natima [27]3 years ago
6 0

Answer:

The density of beryllium copper is 8.5 g/cm³ thus given metal is beryllium copper.

Explanation:

Given data:

Mass of metal = 20 g

Volume of metal = 2.35 cm³

Which metal is this = ?

Solution:

we will apply density formula to solve this problem.

d = m/v

d = density

m = mass

v = volume

d = 20 g/ 2.35 cm³

d = 8.5 g/cm³

The density of beryllium copper is 8.5 g/cm³ thus given metal is beryllium copper.

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Answer:

Number of atoms =1.806×10²⁴

Explanation:

You have the number of moles of Carbon tetrachloride which is n=3

And you are looking for number of atoms that are in the sample, which are represented by the letter "N"

The formula that has both number of moles(n) and number of atoms(N) is written as n=N/Na

Na is called the Avogadros number and it is equal to 6.08×10²³, it never changes(it is a constant)

So you will substitute the number of moles and the avogadros number to you formula, and the only unknown will be the number of atoms which you are looking for

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NB: N does not represent the number of atoms only. It may also represent the number of particles or molecules...

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Hope this helps !

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