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8090 [49]
2 years ago
7

There are two naturally occurring isotopes of copper. 63cu has a mass of 62.9296 amu. 65cu has a mass of 64.9278 amu. determine

the abundance of each isotope.
Chemistry
1 answer:
SSSSS [86.1K]2 years ago
3 0
1) You need to use the atomic mass of copper.


You can find it in a periodic table. It is 63.546 amu.


2) The atomic mass is the weigthed mass of the different isotopes.


This is, the atomic mass of one element is the atomic mass of each isotope times its corresponding abundance:


=> atomic mass of the element = abundance isotope 1 * atomic mass isotope 1 + abundance isotope 2 *  atomic mass isotope 2 + ....+abundance isotope n * atomic mass isotope n.


3) The statement tells there are two isotopes so the abundance of one is x and the abundance of the other is 1 - x


=> 63.546 amu = x * 62.9296 amu + (1-x)*64.9278


=> 63.546 = 62.9296x + 64.9278 - 64.9278x


=> 64.9278x - 62.9296 = 64.9278 - 63.546


=> 1.9982x = 1.3818


=> x = 1.3818 / 1.9982 = 0.6915 = 69.15%


=> 1 - x = 1 - 0.6915 = 0.3085 = 30.85%


Answer:


Cu-63 69.15%;


Cu-65 : 30.85%
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Answer:

Viscosity increases with stronger intermolecular forces

Step-by-step explanation:

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If there are strong intermolecular attractive forces among molecules, it is more difficult for them to move past each other.

For example, the molecules in molasses have strong attractive forces, so it is quite viscous.

8 0
3 years ago
A voltaic cell is constructed with a Cu/Cu²⁺ half-cell and an Ni/Ni²⁺ half-cell. The nickel electrode is negative.(a) Write bala
nalin [4]

The balanced redox reaction is

Cu + Ni²⁺ → Cu²⁺ + Ni

<h3>What is Galvanic cell? </h3>

It is a device that is used for the conversion of the chemical energy which is produce in the redox reaction into the electrical energy. It is also termed as the voltaic cell or electrochemical cell.

In the voltaic cell, at anode which is negative electrode of voltaic cell oxidation occurs and at the cathode which is positive electrode, reduction occurs

<h3>What is redox reaction? </h3>

The reaction in which both reduction and oxidation reaction takes place simultaneously is known as redox reaction.

<h3>What is oxidation reaction? </h3>

The reaction in which a substance or compound or species looses its electrons. In this reaction, oxidation state of an element increases.

<h3>What is reduction reaction? </h3>

The reaction in which a substance or compound or species accept the electrons. In this reaction, oxidation state of an element decreases.

The given two-half reactions are:

At anode:

Cu → Cu²⁺ + 2e-

At cathode:

Ni²⁺ + 2e- → Ni

Redox reaction:

Cu + Ni²⁺ → Cu²⁺ + Ni

According to the voltaic cell, the half-cell reaction (1) shows oxidation reaction therefore, it occurs at anode and the half-cell reaction (2) shows reduction reaction therefore, it occurs at cathode.

Thus, we concluded that the redox reaction is

Cu + Ni²⁺ → Cu²⁺ + Ni

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brainly.com/question/4052514

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5 0
1 year ago
Most fertilizers consist of nitrogen-containing compounds such as NH3,CO(NH2)2,NH4NO3, and (NH4)2SO4. Plants use the nitrogen co
Y_Kistochka [10]

Answer: 1. NH_3=82.4\%

2.  CO(NH_2)_2=46.7\%

3. . NH_4NO_3=35\%

4. (NH_4)_2SO_4=21.2\%

NH_3 has highest nitrogen content.

Explanation:

To calculate the mass percent of element in a given compound, we use the formula:

\text{Mass percent of nitrogen}=\frac{\text{Mass of nitrogen}}{\text{Molar mass of nitrogen compound}}\times 100

1. NH_3

\text{Mass percent of nitrogen}=\frac{\text{Mass of nitrogen}}{\text{Mass of} NH_3}=\frac{14}{17}\times 100=82.4\%

2. CO(NH_2)_2

\text{Mass percent of nitrogen}=\frac{\text{Mass of nitrogen}}{\text{Mass of} CO(NH_2)_2}=\frac{14\times 2}{12\times 1+16\times 1+2\times 14+4\times 1}\times 100=\frac{28}{60}\times 100=46.7\%

3. NH_4NO_3

\text{Mass percent of nitrogen}=\frac{\text{Mass of nitrogen}}{\text{Mass of} NH_4NO_3}=\frac{14\times 2}{14\times 2+16\times 3+4\times 1}\times 100=\frac{28}{80}\times 100=35\%

4. (NH_4)_2SO_4

\text{Mass percent of nitrogen}=\frac{\text{Mass of nitrogen}}{\text{Mass of}(NH_4)_2SO_4}=\frac{14\times 2}{14\times 2+16\times 4+32\times 1+8\times 1}\times 100=\frac{28}{132}\times 100=21.2\%

Thus NH_3 has highest nitrogen content  of 82.4%.

8 0
3 years ago
If a reaction mixture is initially 0.35 m in x, what is the concentration of x after 190 seconds? if a reaction mixture is initi
3241004551 [841]
According to the second-order rate constant formula:

K t = 1/[At]  - 1/[Ao]

when k is the rate constant = 0.035 (given missing in your question)

and t is the time = 190 sec

Ao is the initial concentration of X = 0.35 m 

by substitution:

0.035 * 190 sec = 1/[At]  - 1/0.35

∴ [At] = 0.11 m

∴ the concentration after 190 sec = 0.11 m
8 0
3 years ago
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