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4 years ago

When potassium-40 undergoes decay by electron capture the product is?

1 answer:

andrey2020 [161]4 years ago

4 0

Electron capture decay is a decay process. In this process electron is captured and a proton is converted into a neutron. Hence, mass number remains same but atomic number is lowering by 1 in daughter atom.

K has atomic number 19. Hence daughter atom should have 19 - 1 = 18 as the atomic number. Hence, produced particle is Ar. but the mass number of Ar remains as same as 40.

The equation is,
₁₉⁴⁰K + ₋₁⁰e → ₁₈⁴⁰Ar

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A 12.0-liter sample of air at 25°C and 1.00 atm pressure was collected and dried. After drying, the volume of the sample was exa

zmey [24]

Answer: The mass percent of water in the original air sample is 4.16 %

Explanation:

We are given:

Volume of moist air = 12.0 L

Volume of dry air = 11.50 L

Volume of water lost = (12.0 - 11.50) L = 0.50 L

Here, the percent by mass ratio will be equal to the percent by volume ratio as the number of moles is directly related to the volume.

To calculate the volume percentage of water in the air, we use the equation:

$\text{Volume percent of water}=\frac{\text{Volume of water}}{\text{Volume of air}}\times 100$

Putting values in above equation, we get:

$\text{Volume percent of water}=\frac{0.50L}{12.00L}\times 100\\\\\text{Volume percent of water}=4.16\%$

Hence, the mass percent of water in the original air sample is 4.16 %

8 0

3 years ago

Cu+2AgNO

baherus [9]

Answer:

Mass of Ag produced = 64.6 g

Note: the question is, how many grams of Ag is produced from 19.0 g of Cu and 125 g of AgNO3

Explanation:

Equation of the reaction:

Cu + 2AgNO3 ---> 2Ag + Cu(NO3)2

From the equation above, 1 mole of Cu reacts with 2 moles of AgNO3 to produce 2 moles of Ag and 1 mole of Cu(NO3)2.

Molar mass of the reactants and products are; Cu = 63.5 g/mol, Ag = 108 g/mol, AgNO3 = 170 g/mol, Cu(NO3)2 = 187.5 g/mol

To determine, the limiting reactant;

63.5 g of Cu reacts with 170 * 2 g of AgNO3,

19 g of Cu will react with (340 * 19)/63.5 g of AgNO3 =101.7 g of AgNO3.

Since there are 125 g of AgNO3 available for reaction, it is in excess and Cu is the limiting reactant.

63.5 g of Cu reacts to produce 108 * 2 g of Ag,

19 g of Cu will react to produce (216 * 19)/63.5 g of Ag = 64.6 g of Ag.

Therefore mass of Ag produced = 64.6g

6 0

4 years ago

How many moles of iron (Fe) will be produced from 6.20 moles of carbon monoxide (CO)

anzhelika [568]

Answer:

4.13 moles of Fe will be produced in the reaction

Explanation:

To produce Fe from CO, we need to react Fe₂O₃ and the carbon monoxide.

The reaction is:

Fe₂O₃ + 3CO → 2Fe + 3CO₂

1 mol of iron (III) oxide react to 3 moles of carbon monoxide in order to produce 2 moles of Iron and 3 moles of carbon dioxide.

We assume, the Fe₂O₃ in excess, so we propose this rule of three

3 moles of CO can produce 2 moles of Fe

Therefore 6.20 moles of CO will produce (6.20 . 2)/3 = 4.13 moles of Fe

4 0

3 years ago

Read 2 more answers

what is the electrons, valence electrons, and electron shells number please answer all 3 questions (look at the picture)

MariettaO [177]

In picture one, there are four electrons, one valance electrons and two shells, in image two there are three electrons, one valance electrons and two shells whereas there are 13 electrons, three valance electrons and three shells.

<h3>What is Electrons, Valence Electrons, and Electron Shells Numbers?</h3>

Electrons:

An electron is a negatively charged particle which can be either bounded with to an atom. Electrons belong to the first generation of the lepton particle family, and are generally thought to be elementary particles because they have no known components or substructure.

Valence Electrons:

Valence electrons are those electrons which are present in outermost shell or in valence shell or energy level of an atom. For example, oxygen has six valence electrons, two in the 2s subshell and four in the 2p subshell.

Electron Shells Numbers:

Each shell can contain only a fixed number of electrons: the first shell can hold up to two electrons, the second shell can hold up to eight (2 + 6) electrons, the third shell can hold up to 18 (2 + 6 + 10) and so on.

So we can conclude that In picture one, there are four electrons, one valance electrons and two shells, in image two there are three electrons, one valance electrons and two shells whereas there are 13 electrons, three valance electrons and three shells.

Learn more about Valence Electrons here: brainly.com/question/371590

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4 0

1 year ago

Which of the following ions is least likely to form colored compounds?

andreyandreev [35.5K]

Answer:

i think d maybe correct me if im wrong

Explanation:

3 0

3 years ago