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3 years ago

Which statement is true with respect to standard reduction potentials?

Chemistry

1 answer:

hichkok12 [17]3 years ago

7 0

Answer:

C). Half-reactions with SRP values greater than zero are spontaneous.

Explanation:

SRPs or Standard Reduction Potentials are characterized as the ability of a probable distinction among the anode and cathode of a usual/standard cell. It aims to examine the capacity of chemicals to reduce themselves.

The third statement asserts a true claim regarding the SRPs(Standard Reduction Potentials) that the 'half-reactions which take place with the SRP possesses the values higher than zero and they are unconstrained.' The other statements are incorrect as they either show the estimation of SRPs more than 0 or display them as being restricted. Thus, option C is the correct answer.

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I am Lyosha [343]

I think the answer is A or C sorry for not having that good of an answer

5 0

3 years ago

Terephthalic acid is an important chemical used in the manufacture of polyesters and plasticizers. It contains only , , and . Co

elena55 [62]

Answer:

The molecular formula of Terephthalic acid = $C_8H_{6}O_4$

Explanation:

Taking incomplete things from the original source and assuming,

Mass of water obtained = 16.34 mg

1 mg = 10⁻³ g

Mass of water obtained = 16.34 ×10⁻³ g

Molar mass of water = 18 g/mol

Moles of $H_2O$ = 16.34 ×10⁻³ g /18 g/mol = 0.000907778 moles

2 moles of hydrogen atoms are present in 1 mole of water. So,

Moles of H = 2 x 0.000907778 = 0.0018156 moles

Molar mass of H atom = 1.008 g/mol

Mass of H in molecule = 0.0018156 x 1.008 = 0.00183 g

Mass of carbon dioxide obtained = 106.4 mg

1 mg = 10⁻³ g

Mass of carbon dioxide obtained = 106.4 ×10⁻³ g

Molar mass of carbon dioxide = 44.01 g/mol

Moles of $CO_2$ = 106.4 ×10⁻³ g /44.01 g/mol = 0.002418 moles

1 mole of carbon atoms are present in 1 mole of carbon dioxide. So,

Moles of C = 0.002418 moles

Molar mass of C atom = 12.0107 g/mol

Mass of C in molecule = 0.002418 x 12.0107 = 0.029037 g

Given that the Terephthalic acid only contains hydrogen, oxygen and carbon. So,

Mass of O in the sample = Total mass - Mass of C - Mass of H

Mass of the sample = 50.20 mg

1 mg = 10⁻³ g

Mass of the sample = 50.20 ×10⁻³ g

Mass of O in sample = 50.20 ×10⁻³ g - 0.029037 g - 0.00183 g = 0.019333 g

Molar mass of O = 15.999 g/mol

Moles of O = 0.019333 / 15.999 = 0.0012083 moles

Taking the simplest ratio for H, O and C as:

0.0018156 : 0.0012083 : 0.002418

= 3 : 2 : 4

The empirical formula is = $C_4H_3O_2$

Molecular formulas is the actual number of atoms of each element in the compound while empirical formulas is the simplest or reduced ratio of the elements in the compound.

Thus,

Molecular mass = n × Empirical mass

Where, n is any positive number from 1, 2, 3...

Mass from the Empirical formula = 4×12 + 8×1 + 16×2= 88 g/mol

Given, Mass = 28.2 g

Moles = 0.170 moles

The formula for the calculation of moles is shown below:

$moles = \frac{Mass\ taken}{Molar\ mass}$

Thus,

$0.170\ mole= \frac{28.2\ g}{Molar\ mass}$

Molar mass = 165.8824 g/mol

So,

Molecular mass = n × Empirical mass

165.8824 = n × 88

⇒ n = 2

The molecular formula of Terephthalic acid = $C_8H_{6}O_4$

4 0

3 years ago

Check my answers, please?

sertanlavr [38]

The answer should be 1.b2.b3.c4.b5.c

4 0

3 years ago

Read 2 more answers

If a chemical appears on the periodic table, it is a(n), ____________

marissa [1.9K]

Answer:

An element

Explanation:

If a chemical appears on the periodic table, it is an element.
An element is a pure substance that is made up of similar atoms.
It is the simplest particle of a substance that can not be broken down into simpler units using chemical means. Examples of elements include sodium metal, oxygen gas, magnesium metal, silicon, etc.
A compound, on the other hand, is a substance made up of two or more atoms that are different.
A compound results from the chemical combination of more than two elements, for example, H2O, NaNO3, etc.

5 0

3 years ago

If 3.18 x 10^23 atoms of iron react with 67.2 L of chlorine gas at STP, what is the maximum

spin [16.1K]

84.34 grams of grams of iron (III) chloride that can be produced is maximum because Fe is the limiting reagent in this reaction and chlorine gas is excess reagent.

Explanation:

Balanced chemical equation:

2 Fe + 3 Cl2 → 2 FeCl3

DATA GIVEN:

iron = atoms

mass of chlorine gas = 67.2 liters

mass of FeCl3 = ?

number of moles of iron will be calculated as

number of moles = $\frac{total number of atoms}{Avagaro's number}$