given the reaction 4Na(s) +O2 -> 2Na2O How many grams of Na2O can form from 3.0g of Na? use these molecular weight Na=23g/mole and O = 16g / mole​

5.89 x \(10^{8}\)  electron volts is  the binding energy of the nucleus with Z=29 and A=63.

The binding energy of a nucleus can be calculated using the mass defect of the nucleus and Einstein's famous equation E=mc². The mass defect represents the difference between the total mass of the individual protons and neutrons in the nucleus and the actual mass of the nucleus.

Given that Z=29 (the atomic number, which represents the number of protons) and A=63 (the mass number, which represents the total number of protons and neutrons), we can calculate the number of neutrons in the nucleus using the formula N=A-Z.

N = 63 - 29 = 34

Next, we calculate the total mass of the protons and neutrons:

Total mass = (29 * 1.0075 u) + (34 * 1.0087 u)

Total mass ≈ 29.1865 u + 34.3018 u ≈ 63.4883 u

Now, we convert the mass of the nucleus to kilograms:

Mass of nucleus = 63.4883 u * (1.66 x \(10^{-27}\) kg/u)

Mass of nucleus ≈ 1.052 x \(10^{-25}\) kg

Finally, we can calculate the binding energy using the equation E=mc²:

Binding energy = (1.052 x \(10^{-25}\) kg) * (3 x \(10^{8}\) m/s)²

Binding energy ≈ 9.44 x \(10^{-11}\) J

Converting to electron volts (eV) using the conversion factor 1 J = 6.242 x \(10^{18}\) eV:

Binding energy ≈ (9.44 x \(10^{-11}\) J) * (6.242 x \(10^{18}\) eV/J)

Binding energy ≈ 5.89 x \(10^{8}\) eV

Therefore, the binding energy of the nucleus with Z=29 and A=63 is approximately 5.89 x \(10^{8}\) electron volts.

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Answer:

b, c, e

Explanation:

Inorganic compounds usually lack carbon.

Inorganic compounds are not associated with or made from living things.

Inorganic compounds include salt and water​.

Answer:

yes the answer id bce

Explanation:

Answer:

Coke.

Explanation:

The distillation of coal tar can obtain aromatic compounds like benzene and toluene, and also phenolic compounds like phenol. Hence, the only option here that cannot be obtained from the distillation of coal tar is coke.

Hope this helped!

Answer:

Pentane » Hexane » Hexanol

Explanation:

Pentane and Hexane are simple molecular structured with discrete molecules having weak vanderwaals forces of attraction. But Hexane has high molecular mass than pentane hence pentane has lower boiling point than Hexane.

Hexanol has hydrogen bonds between highly electronegative oxygen atom and the hydrogen atom which break on high heat energy application hence it has high boiling point.

Gamma rays can be produced by;

We know that the gamma rays is an electromagnetic wave and this means that it has no mass or charge as we know.

Gamma rays can be produced by several processes, including:

Nuclear decay (such as the decay of radioactive isotopes)

Collisions between energetic particles

Magnetic reconnection in astronomical objects such as black holes, neutron stars, and pulsars

Annihilation of matter and antimatter

Processes in the Sun's corona

Supernovae explosions.

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Answer: 2.3% :)

............................

Answer: 34%

Explanation:

Answer:

C) or group 16

Explanation:

Edg 2020

The element has six valence electrons available for bonding belonging to group 16 in the periodic table. Therefore, option (C) is correct.

The elements with a similar outer electronic configuration in their atoms are organized in the same group of the modern periodic table. These valence electrons decide the chemical properties and are responsible for the reactivities of the elements.

The chemical behavior of chemical elements depends on the number of valence electrons in their valence shell. Elements arranged in the same group have the same number of valence electrons. Therefore, elements placed in the same group have similar chemical properties.

The element of group 16 have a general valence electron configuration is ns²np⁴. Therefore, all elements present in group 16 have six valence electrons available for bonding with other atoms.

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Answer: c????????

Explanation:

The volume in liters of a 2.0 M solution of NaOH that can be made using 500.0 g NaOH is 6.25 liters.

The molarity of a solution is the concentration of a solution expressed in moles of solute per given liter of solution.

The molarity of a solution is given mathematically as follows:

The volume in liters of a 2.0 M solution of NaOH that can be made using 500.0 g NaOH is calculated below:

Moles of solute = mass/molar mass

Moles of NaOH = 500 / 39.997

Moles of NaOH = 12.5 moles

Volume of solution = 12.5 / 2.0

Vlume of solution = 6.25 liters

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The final temperature of the water is: T_final = 45.0°C

We can use the formula for the specific heat capacity of the water to solve this problem:

q = mcΔT

First, we can calculate the initial energy of the water:

q = mcΔT

q = (10.0 g) (4.184 J/g°C) (25.0°C)

q = 1,046 J

Next, we can calculate the final temperature after absorbing 840 J:

q = mcΔT

840 J = (10.0 g) (4.184 J/g°C) (ΔT)

ΔT = 20.0°C

Therefore, the final temperature of the water is:

T_final = T_initial + ΔT

T_final = 25.0°C + 20.0°C

T_final = 45.0°C

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The word "symptom" refers to a specific manifestation or indication of a condition, disease, or disorder that is experienced or observed by an individual.

Symptoms are subjective or objective changes in the body's normal functioning that may be recognized as abnormal, uncomfortable, or problematic. Symptoms can manifest in various ways depending on the nature of the underlying condition. They can be physical, such as pain, rash, cough, fever, or fatigue, indicating an illness or injury affecting the body. Symptoms can also be psychological, such as anxiety, depression, or confusion, reflecting disturbances in mental health.

Symptoms serve as important clues for medical professionals to identify and diagnose diseases or disorders. They provide valuable information about the nature, severity, and progression of an illness, helping healthcare providers formulate appropriate treatment plans. Additionally, symptoms may also be important for individuals to self-assess their own health status and seek appropriate medical attention.

It is essential to note that symptoms alone may not provide a definitive diagnosis, as they can overlap across different conditions. Further evaluation, including medical tests and examinations, is often necessary to confirm a diagnosis and determine the appropriate course of action.

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Answer: 32g of sulfur, S, is 1 molar mass

1 molar mass contains X particles (in this case, atoms)

32g of oxygen, O2, is 1 molar mass

1 molar mass contains X particles (in this case, molecules)

There are 2 oxygen atoms in each molecule of O2 gas

Therefore, there are 2X atoms of oxygen in 32g of oxygen gas.

Explanation:  bcs yes

The value of x in the compound SOₓ is 3 . The compound is SO₃

The relative atomic mass of sulphur is given as 32

The relative atomic mass of oxygen is given as 16

The compound shown contains 80 g of sulphur and 120 g of oxygen.

The value of x can be calculated as follows:

molecular mass of S0ₓ = 32 + 16x

if 32 g of sulphur is in 32 + 16x of the of S0ₓ

80 g of sulphur is in 200 g of the compound

cross multiply

200(32) = 80(32 + 16x)

6400 = 2560 + 1280x

6400 - 2560 = 1280x

3840 = 1280x

x = 3840 / 1280

x = 3

Therefore, the compound is SO₃

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Hg = (3.2 : 4.2) x 100% = 76.19%

O = (1 : 4.2) x 100% = 23.81%

Approximately 166.67 mL of water needs to be evaporated from 250 mL of 1 M Ca(OH)2 to make it 3 M.

The relationship between the initial and final concentrations and volumes must be taken into account.

Given: Initial concentration \((C^1) = 1 M Initial volume (V^1) = 250 mL\)

\((C^2) = 3 M final concentration\)

We can use the equation:

\(C^1 * V^1 = C^2 * V^2\)

Where:

\(V^2\)is the final volume of the solution

Rearranging the equation to solve for V2:

\(V^2 = (C^1 * V^1) / C^2\)

Substituting the given values:

\(V^2 = (1 M * 250 mL) / 3 M\)

\(V^2 = 250 mL / 3\)

\(V^2\) ≈ \(83.33 mL\)

To find the amount of water that needs to be evaporated, we subtract the final volume from the initial volume:

Amount of water to be evaporated = \(V^1 - V^2\)

Amount of water to be evaporated = 250 mL - 83.33 mL

Amount of water to be evaporated ≈ 166.67 mL

Therefore, approximately 166.67 mL of water needs to be evaporated from 250 mL of 1 M Ca(OH)2 to make it 3 M.

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The ratio of the volume of lead to the volume of chromium is 22 : 35

Density is simply defined as the mass of a substance per unit volume of the substance.

To solve the question given above, we'll begin by calculating the volume of lead and chromium. This can be obtained as follow:

Mass of lead = 1 g

Density of lead = 11.3 g/cm³

Density = mass /volume

11.3 = 1 / Volume

Cross multiply

11.3 × Volume = 1

Divide both side by 11.3

Volume = 1 / 11.3

Mass of chromium = 1 g

Density of chromium = 7.14 g/cm³

Density = mass /volume

7.14 = 1 / Volume

Cross multiply

7.14 × Volume = 1

Divide both side by 7.14

Volume = 1 / 7.14

Finally, we shall determine the ratio of the volume of lead to the volume chromium. This can be obtained as follow:

Volume of lead = 0.088 cm³

Volume of chromium = 0.14 cm³

Ratio = Volume of lead / Volume of chromium

Ratio = 0.088 / 0.14

Ratio = 22 / 35

Therefore, the ratio of the volume of lead to the volume chromium is 22 : 35

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The reaction that has the fastest rate of reverse  reaction is the one in which Ea= Ea3 = 54 kJ/mol , ΔE= ΔE3 = 8 kJ/mol (Option A).

The term activation energy refers to the minimum energy that reactants must possess in order for their collision to result in a chemical reaction.

The higher the activation energy, the faster the reverse reaction. Hence the reaction that has the fastest rate of reaction is the one in which Ea= Ea3 = 54 kJ/mol , ΔE= ΔE3 = 8 kJ/mol (Option A).

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Answer:

ok, here is your answer

Explanation:

AI-generated answer

To find the mass of oxygen that reacted, we need to use the Law of Conservation of Mass, which states that in a chemical reaction, the mass of the reactants equals the mass of the products.

First, we need to find the number of moles of hydrogen that reacted:

Molar mass of hydrogen (H₂) = 2.016 g/mol

Number of moles of H₂ = mass/molar mass = 46.2 g/2.016 g/mol = 22.92 mol

Next, we need to use the balanced chemical equation to find the number of moles of water produced:

hydrogen + oxygen → water

2H₂ + O₂ → 2H₂O

From the equation, we can see that for every 2 moles of H₂, 1 mole of O₂ is required to produce 2 moles of H₂O. Therefore, the number of moles of O₂ required to produce 22.92 moles of H₂O is:

Number of moles of O₂ = 1/2 x 22.92 mol = 11.46 mol

Finally, we can find the mass of oxygen that reacted by using its molar mass:

Molar mass of oxygen (O₂) = 32.00 g/mol

Mass of oxygen = number of moles x molar mass = 11.46 mol x 32.00 g/mol = 366.72 g

Therefore, the mass of oxygen that reacted is 366.72 g.

The concept molarity is used here to determine the pH after adding 12.6 mL of the base. The term molarity is an important method which is used to calculate the concentration of a solution. Here the pH is 1.23.

The term molarity is defined as the number of moles of the solute dissolved per litre of the solution. It is also called the molar concentration. It is represented as 'M' and its unit is mol / L.

Molarity is given as:

M = Number of moles / Volume of solution in liters

'n' of HCN = 20.2 × 1 L / 1000 mL × 0.382 = 0.0077 mol

'n' of Ba(OH)₂ = 13.7 × 1L / 1000 mL × 0.421 = 0.0057 mol

Excess H⁺ = 0.002

Total volume = 20.2 + 13.7 = 33.9 mL = 0.0339 L

Concentration of H⁺ = 0.002 / 0.0339 = 0.058

So pH is:

pH = - log[H⁺]

pH = - log[ 0.058] = 1.23

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Answer:

The correct answer is the epipelagic zone

Answer:

B

Explanation:

Atoms of different elements have different atomic structures because they contain different numbers of protons and electrons. Here the given atomic models represent Beryllium, Be, and boron, B. The correct option is D.

An atomic model refers to the structure of an atom which comprises of a nucleus at the centre in which the protons and neutrons are present. The positively charged particles are called protons, negatively charged particles are called electrons whereas neutrons are neutral.

The number of protons or electrons in atom is known as the atomic number. The sum of number of protons and neutrons is called the mass number. Neutral atoms have equal numbers of protons and electrons.

Here 'Be' atom has 4 protons and hence its atomic number is 4, similarly 'B' atom has 5 protons and its atomic number is 5.

Thus the correct option is D.

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0.0205 moles of water were lost if the amount of water lost was 0.369 grams. The given answer is in three significant figures with including zero before the decimal.

To find the number of moles of water lost, we need to know the molar mass of water (H2O).

Molar mass is the sum of the atomic masses of all the atoms present in a molecule.

Since the molecule of water contains two atoms of hydrogen and one atom of oxygen, the molar mass of water is given by the sum of the atomic masses of two hydrogen atoms and one oxygen atom, which is: 2(1.008 g/mol) + 1(15.999 g/mol) = 18.015 g/mol

Therefore, one mole of water has a mass of 18.015 g.

The number of moles of water lost can be calculated using the following formula: Number of moles = Mass of substance / Molar mass of substance

Substituting the given values, we get: Number of moles = 0.369 g / 18.015 g/mol = 0.0205 mol

Thus, 0.0205 moles of water were lost if the amount of water lost was 0.369 grams.

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Answer:

26.110 grams of O2 produced.

Explanation:

Calculate the amount of moles in KClO3 by dividing the amount of grams given by the atomic weight of the substance.

To get the atomic weight: K = 39.098, Cl = 35.45, O = 15.999, and there are 3 molecules of Oxygen, so multiply 15.999 by three.

39.098 + 35.45 + (15.999 * 3) = 122.548.

66.7g / 122.548 atomic mass = 0.544 moles.

The ratio of moles of KClO3 to moles of O2 is 2 to 3.

\(\frac{2}{3}\) = \(\frac{0.544}{y}\)

Cross multiply to get 1.632 = 2y. Y = 0.816, meaning 0.816 moles of O2 will be produced.

Convert this into grams by multiplying by the atomic weight of O2 (15.999 * 2 = 31.998).

0.816 * 31.998 = 26.110 grams of O2 produced.

Answer: This would be C.) 70%

Explanation:

The molarity of the NiSO₄ solution made by dissolving 38.81 grams of nickel (ii) sulfate, NiSO₄, in enough water to make 0.467 liters of solution is 0.535 M

First, we shall obtain the mole of 38.81 grams of nickel (ii) sulfate, NiSO₄. Details below:

Mole of NiSO₄ = mass / molar mass

= 38.81 / 154.75

= 0.25 mole

Now, we shall determine the molarity of the solution. Details below:

Molarity of solution = mole / volume

= 0.25 / 0.467

= 0.535 M

Thus, the molarity of the solution is 0.535 M

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Answer:

D

Explanation:

the acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of an object

Answer:

You forgot to add a screenshot buddy.

Explanation:

Hydrogen bonding, which is unquestionably what we have, will occur from the intermolecular force between the molecules of H2O and CH3OH. Atoms trade or exchange valence electrons to create bonds.

Trust and self-esteem are developed in children and adolescents through strong emotional ties. After that, they can leave the family and establish wholesome friendships and other types of social ties. Healthy relationships consequently lower a child's chances of emotional discomfort or antisocial behaviour.

The government of a country issues government bonds, a sort of fixed-interest bond. These bonds are thought of as low-risk investments. Examples of different kinds of government bonds include T - bills, Municipality Bond, Zero-Coupon Bonds, and others.

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Answer:

Explanation:

the molar mass for Na2CO3 is 2*23+12+3*16=106 g/mole

106*0.251=26.606 grames