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Elena L [17]
3 years ago
12

What is the mass of 4.5 x 10^22 molecules of hydrogen peroxide H2O2

Chemistry
1 answer:
Oksana_A [137]3 years ago
5 0

Answer:

The answer is 2.54g

To find the mass we must first find the number of moles we use the Formula ;

N = n × L

where

N is the number of entities

n is the number of moles

L is the Avogadro's constant which is

6.023 × 10^23

n = N / L

N = 4.5 x 10^22 molecules

n = 4.5 x 10^22 / 6.023 × 10^23

n = 0.0747 moles

Molar mass = mass / number of moles

Molar mass of H2O2 = (2 × 1) + (16 × 2)

= 2 + 32

= 34g/mol

mass = molar mass × number of moles

= 34 × 0.0747

= 2.5398

= 2.54g

Hope this helps

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If an element has an atomic number of 20 and a mass number of 41, what is the :
iVinArrow [24]

Answer:

20 protons, 20 electrons, and 21 neutrons

Explanation:

The atomic number of an atom is the number of protons it has. If the atomic number is 20 then we know the atom has 20 protons.

•The mass number of an atom is the total number of protons and neutrons the atom contains. The mass number is 41 and the number of protons is 20, just subtract 20 from 41 and you will get the number of neutrons: 41 - 20= 21. The atoms has 21 neutrons.

•The number of electrons found in an atom is equal to the number of protons. The atoms has 20 protons which means it has 20 electrons.

So, the answer is:

20 protons, 20 electrons, and 21 neutrons

8 0
3 years ago
Why was Niels Bohr’s atomic model superior to all the earlier models?
gladu [14]
1) it explains about stability of an atom by including stationary state.
2) it explains tge quantization of energy.
3) it gives the concept of angular momentum of a revolving electron.
6 0
3 years ago
Read 2 more answers
scandium47 has a half-life of 35s. suppose you have a 45g sample of scadium 47 how much of the sample remains unchanged after 14
Mars2501 [29]

 The much  of the sample that would remain  unchanged  after 140 seconds is 2.813 g

Explanation

Half life  is time taken for the quantity  to reduce  to half its original value.

if the half life  for Scandium  is 35 sec, then the number  of half life in 140 seconds

=140 sec/ 35 s = 4 half life

Therefore 45 g after first half life = 45 x1/2 =22.5 g

               22.5 g after second half life = 22.5 x 1/2 =11.25 g

            11.25 g after third half life = 11.25 x 1/2 = 5.625 g

             5.625 after  fourth half life = 5.625 x 1/2 = 2.813

therefore 2.813 g  of Scandium 47 remains  unchanged.

4 0
2 years ago
Pls need help for answer now
yawa3891 [41]
The answer is 0.375 mol of silver chromate
5 0
3 years ago
See questions on the sheet
nignag [31]

Answer:

The first question is 4

The second one is 1

Explanation:

Please mark brainliest! Hope it helped!

8 0
3 years ago
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