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Bond [772]
3 years ago
5

Will vote brainliest and 5 star

Chemistry
1 answer:
svetoff [14.1K]3 years ago
4 0

Answer:

it is B

Explanation:

hope it helps you

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Write the isotope notation for the following isotope: copper-63, copper-65, magnesium-24, magnesium-25, magnesium-26, lithium-6,
andrey2020 [161]
63/29 Cu (copper-63)
65/29 Cu (copper-65)
24/12 Mg (magnesium 24)
25/12 Mg (magnesium 25)
26/12 Mg (magnesium 26)
6/3 Li (lithium 6)
7/3 Li (lithium 7)

The top number is the mass number and you find that by adding the number of neutrons and atomic number
The bottom number is the atomic number and it’s the number or protons
3 0
3 years ago
How many liters of nitrogen gas are needed to make 25 mol of nitrogen trifluoride
ikadub [295]
The reaction between N₂ and F₂ gives Nitrogen trifluoride as the product. The balanced equation is;

N₂ + 3F₂ → 2NF₃

The stoichiometric ratio between N₂ and NF₃ is 1 : 2
Hence, 
  moles of N₂ / moles of F₂ = 1 / 2
  moles of N₂ / 25 mol        =  0.5
           moles of N₂            =  0.5 x 25 mol = 12.5 mol
 
Hence N₂ moles needed  = 12.5 mol

At STP (273 K and 1 atm) 1 mol of gas = 22.4 L

Hence needed N₂ volume = 22.4 L mol⁻¹ x 12.5 mol
                                          = 280 L 
6 0
3 years ago
What is the molar mass of BaBr2?<br><br>multiple choice on the picture
laiz [17]

B. 297.1 g/mol

Is your answer! ;)

3 0
3 years ago
Read 2 more answers
Question 3<br> 6.06 X 103 L<br> How many significant figures are there
VashaNatasha [74]
There should be 22 figures .
4 0
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What does the number 84 in the name krypton 84 represent
Shtirlitz [24]
Hi :)

The bottom number tells you how many protons you have in the nucleus of this element.

In Krypton-84, this means that you have 84 nucleons, where 36 of these are protons, and the remaining 48 are neutrons.


Hope this helps :)
5 0
3 years ago
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