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3 years ago

For the skeletal chemical equation

1 answer:

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An 80.0 g sample of iodine-131 was placed in a sealed vessel forty days ago. Only 2.5 g of this isotope is now left. What is its

MA_775_DIABLO [31]

1.25, you divide 2.5 by 80, then times by 40

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3 years ago

Read 2 more answers

Chemistry: Gas Laws Problems!

Ronch [10]

Answer : The final volume at STP is, 1000 L

Explanation :

According to the Boyle's, law, the pressure of the gas is inversely proportional to the volume of gas at constant temperature and moles of gas.

$P\propto \frac{1}{V}$

or,

$P_1V_1=P_2V_2$

where,

$P_1$ = initial pressure = 1520 mmHg = 2 atm (1 atm = 760 mmHg)

$P_2$ = final pressure at STP = 1 atm

$V_1$ = initial volume = 500.0 L

$V_2$ = final volume at STP = ?

Now put all the given values in the above formula, we get:

$2atm\times 500.0L=1atm\times V_2$

$V_2=1000L$

Therefore, the final volume at STP is, 1000 L

7 0

3 years ago

An ionic isotope has 49 protons, 50 electrons, and 55 neutrons.

bulgar [2K]

We have that

The Element with 49 protons is Indium

the isotope symbol in the one-line format

indium -104

We have that this is a cation

From the question we are told

An ionic isotope has 49 protons, 50 electrons, and 55 neutrons.

• What is the name of the element?

What is the isotope symbol in the one-line format (e.g., hydrogen-2)?

Is this a cation or is this an anion? Explain how you know.

Generally

Generally an isotope is an a variant form of a element bearing different number of Neutrons but same Proton

Therefore

For an isotope with 49 protons, 50 electrons, and 55 neutrons.

The Element with 49 protons is Indium

the isotope symbol in the one-line format

indium -104

We have that this is a cation

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6 0

3 years ago

In which of the following species does sulfur have the lowest oxidation number? A) S8 B) SO(3)2- C)SO(4)2- D)S(2)O(3)2- E)S2-

sp2606 [1]

$S^{2-}$ is having lowest oxidation number of sulphur in teh options given. The oxidation number is -2.

The correct option is E.

Explanation:

$S^{2-}$ have oxidation number of -2, which is lowest in all the options given.

In the given examples $S_{8}$ will have oxidation number zero because it is in elemental form. In the rules for oxidation number it is given that any element in free state has its oxidation number zero.

All other options are in compound form as:

S $O_{3} ^{2-}$ = oxidation number is +4. It is calculated as oxygen having O.N of -2,

The charge on the atom is -2, so sum of the oxidation numbers of all the elements should be equal to -2.

x+3(-2)= -2

x = 4

S $O_{4} ^{2-}$ = The charge on the atom is -2, so sum of the oxidation numbers of all the elements should be equal to -2.

x +4(-2) = -2

x = +6

$S_{2}O_{3^{2-} }$

The charge on the atom is -2, so sum of the oxidation numbers of all the elements should be equal to -2.

2x + 3(-2) = -2

2x = 4

x = 2

$S^{2-}$ = oxidation number is -2 as the charge on ion in equal to its oxidation number.

7 0

3 years ago

A structure that contains an amide

Mnenie [13.5K]

An example of a structure that contains amide is the nylon, paracetamol, and dimethylformamide.

<h3>What is an amide?</h3>

An amide is defined as the organic chemical compound which is a functional group that contains carbonyl group bonded to a nitrogen or any compound containing this functional group.

Typical examples of compounds that contains an amide group include the following:

Nylon: This is a chemical compound that contains synthetic copolymer composed of secondary amides separated by two or more methylene groups.
paracetamol, and
dimethylformamide.

Learn more about nylon here:

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2 years ago