All categories

4 years ago

How many atoms are in 7.0 g of Ne?

Chemistry

1 answer:

ArbitrLikvidat [17]4 years ago

8 0

Answer:

2.11×10²³ atoms.

Explanation:

From the question given above, the following data were obtained:

Mass of Ne = 7 g

Number of atoms =?

Recall:

1 mole of Ne = 6.02×10²³ atoms

1 mole of Ne = 20 g

Thus,

20 g of Ne = 6.02×10²³ atoms

Finally, we shall determine the number of atoms in 7 g of Ne. This can be obtained as follow:

20 g of Ne = 6.02×10²³ atoms

Therefore,

7 g of Ne = (7 × 6.02×10²³) / 20

7 g of Ne = 2.11×10²³ atoms

Thus, 7 g of Ne contains 2.11×10²³ atoms.

You might be interested in

In a stable atom, the number of protons are?

LenKa [72]

Answer:

Every element has a proton, neutron, and electron. The number of protons is equal to the atomic number, and the number of electrons is equal to the protons unless it is an ion.

5 0

3 years ago

Read 2 more answers

How many unpaired electrons would you expect on aluminum in aluminum oxide.?

sergeinik [125]

Answer: There are 3 unpaired electrons on aluminium in aluminium oxide.

Explanation:

Chemical formula of aluminium oxide is $Al_{2}O_{3}$ .

The atomic number of aluminium is 13 and its electronic configuration is $1s^{2}2s^{2}2p^{6}3s^{2}3p^{1}$ . In order to complete its octet, aluminium will lose or donate 3 electrons to the oxygen atom as it has 3 electrons in excess.

Thus, there are three unpaired electrons on one aluminium atom.

Since, there are two aluminium atoms in $Al_{2}O_{3}$ , so, there will be in total 6 unpaired electrons on two aluminium atoms. Whereas each oxygen atom has deficiency of 2 electrons so, each aluminium atom will donate its excess of electrons to each oxygen atom.

4 0

3 years ago

Read 2 more answers

What is the amount of space occupied by a sample of matter

dusya [7]

The amount of space that matter occupies is called its volume. Solids, liquids, and gases all have volume.

3 0

2 years ago

Copper has two naturally occurring isotopes with atomic masses of 62.9296 u () and 64.9278 u (). The atomic mass of copper is 63

natta225 [31]

Answer:

The abundance of first isotope is 69.15 %

The abundance of second isotope is 30.85 %

Explanation:

The formula for the calculation of the average atomic mass is:

$Average\ atomic\ mass=(\frac {\%\ of\ the\ first\ isotope}{100}\times {Mass\ of\ the\ first\ isotope})+(\frac {\%\ of\ the\ second\ isotope}{100}\times {Mass\ of\ the\ second\ isotope})$

Given that:

Since the element has only 2 isotopes, so the let the percentage of first be x and the second is 100 -x.

For first isotope:

% = x %

Mass = 62.9296 u

For second isotope:

% = 100 - x

Mass = 64.9278 u

Given, Average Mass = 63.546 u

Thus,

$63.546=\frac{x}{100}\times {62.9296}+\frac{100-x}{100}\times {64.9278}$

Solving for x, we get that:

x = 69.15 %

<u>The abundance of first isotope is 69.15 %</u>

<u>The abundance of second isotope is 100 - 69.15 % = 30.85 %</u>

4 0

4 years ago

Which of the following is a chemical property of a sheet of paper?

Tomtit [17]

Answer:

Explanation:

Flammability is a chemical property. The paper crumbling would be a physical property. The inability to attract a magnet or conduct electricity would be considered electrical properties

3 0

3 years ago