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Leya [2.2K]
2 years ago
15

Write the isotope notation for the following isotope: copper-63, copper-65, magnesium-24, magnesium-25, magnesium-26, lithium-6,

and lithium-7.
Chemistry
1 answer:
andrey2020 [161]2 years ago
3 0
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
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If 23.6 g of hydrogen gas reacts with 28.3 g of nitrogen gas, what is the maximum amount of product that can be produced?
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Answer:

34.3 g NH3

Explanation:

M(H2) = 2*1 = 2 g/mol

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M(NH3) = 14 + 3*1 = 17 g/mol

23.6 g H2* 1 mol/2 g = 11.8 mol H2

28.3 g N2 * 1 mol/28 g = 1.01 mol N2

                                 3H2 + N2 ------> 2NH3

from reaction         3 mol    1 mol

given                   11.8 mol    1.01 mol

We can see that H2 is given in excess, N2 is limiting reactant.

                                 3H2 + N2 ------> 2NH3

from reaction                     1 mol         2 mol

given                                 1.01 mol      x

x = 2*1.01/1= 2.02 mol NH3

2.02 mol * 17g/1 mol ≈ 34.3 g NH3

8 0
3 years ago
What is an isotope? atoms of the same element with different number of​
geniusboy [140]

Answer:

The same element that contain equal number if protons but different number of neurons in their nuclei and hence differ in relative atomic mass

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D) Adding a catalyst

Explanation:

Adding a catalyst decreases activation energy and allows the reaction to occur more easily.

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