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3 years ago

What is the net cell reaction for the iron-silver voltaic cell?

1 answer:

4 0

The net cell reaction for the iron-silver voltaic cell would be:

3Ag+ + Fe --------> 3Ag + Fe3+

wherein it comes from the reaction of the cathode and the anode:

Ag+ + e- -------> Ag, for the cathode and;

Fe -------> Fe3+ + 3e-, for the anode

When both equations would be multiplied, the it would now yield the balanced net reaction as stated above.

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Gallium oxide, Ga.Oy, forms when gallium is combined with oxygen. A 1.25 g of Ga is allowed to react with excess oxygen and 1.68

mrs_skeptik [129]

Answer : The chemical formula of a compound is, $Ga_2O_3$

Solution : Given,

Mass of gallium = 1.25 g

Mass of gallium oxide = 1.68 g

Mass of oxygen = Mass of gallium oxide - Mass of gallium

Mass of oxygen = 1.68 - 1.25 = 0.43 g

Molar mass of Ga = 69.72 g/mole

Molar mass of O = 16 g/mole

Step 1 : convert given masses into moles.

Moles of Ga = $\frac{\text{ given mass of Ga}}{\text{ molar mass of Ga}}= \frac{1.25g}{69.72g/mole}=0.0179moles$

Moles of O = $\frac{\text{ given mass of O}}{\text{ molar mass of O}}= \frac{0.43g}{16g/mole}=0.027moles$

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For Ga = $\frac{0.0179}{0.0179}=1$

For O = $\frac{0.027}{0.0179}=1.5$

The ratio of Ga : O = 1 : 1.5

To make in whole number we multiple ratio by 2, we get:

The ratio of Ga : O = 2 : 3

The mole ratio of the element is represented by subscripts in empirical formula.

The Empirical formula = $Ga_2O_3$

The empirical formula weight = 2(69.72) + 3(16) = 187.44 gram/eq

Now we have to calculate the molecular formula of the compound.

Formula used :

$n=\frac{\text{Molecular formula}}{\text{Empirical formula weight}}$

$n=\frac{187.44}{187.44}=1$

Molecular formula = $(Ga_2O_3)_n=(Ga_2O_3)_1=Ga_2O_3$

Therefore, the chemical of the compound is, $Ga_2O_3$

5 0

3 years ago

Examples of pure and impure substances

erastova [34]

Pure- table salt
Impure- vegetable oil

8 0

3 years ago

Read 2 more answers

Which will have both the highest ionization energy and the largest atomic

dalvyx [7]

Answer:

Bromine

Explanation:

Cuz it has bro in it :)

8 0

3 years ago

Consider a galvanic cell based on the reaction Al^3+_(aq) + Mg_(s) rightarrow Al_(s) + Mg^2+ _(aq) The half-reactions are Al^3+

grin007 [14]

Answer: The standard cell potential of the cell is -0.71 V

Explanation:

The half reactions follows:

Oxidation half reaction: $Mg\rightarrow Mg^{2+}+2e^-;E^o_{Mg^{2+}/Mg}=-2.37V$ ( × 3)

Reduction half reaction: $Al^{3+}(aq.)+3e^-\rightarrow Al(s);E^o_{Al^{3+}/Al}=-1.66V$ ( × 2)

The balanced cell reaction follows:

$2Al^{3+}(aq.)+3Mg(s)\rightarrow 2Al(s)+3Mg^{2+}(aq.)$

To calculate the $E^o_{cell}$ of the reaction, we use the equation:

$E^o_{cell}=E^o_{cathode}-E^o_{anode}$

Substance getting oxidized always act as anode and the one getting reduced always act as cathode.

Putting values in above equation, we get:

$E^o_{cell}=-2.37-(-1.66)=-0.71V$

Hence, the standard cell potential of the cell is -0.71 V

8 0

3 years ago

Which advantage of subdividing science into different areas ?

MakcuM [25]

Answer:a successful classification or division implies the presence of the object own of each science and its relations with other related areas, the method or requirement of each science to face its object, and also its purpose for which poduce the fact of investigation.

Explanation:

Science is divided into numerous areas, each of which has as its object only a part of all the knowledge acquired, through experience and research.

The primary objective of science, is to improve the quality of life of humans, also helps solve everyday questions.

Science can be subdivided according to its object, its method, others by its affinity, complexity and dependence, however all classification tends to seek the links or relationships between the different disciplines or forms of knowledge, thus a successful classification or division implies the presence of the object own of each science and its relations with other related areas, the method or requirement of each science to face its object, and also its purpose for which poduce the fact of investigation.

7 0

3 years ago