- How many grams of nitrogen (N2) are needed to react with 435.2 g of oxygen (02) in the following equation?
N2 + O2 → 2NO
N2= 28.02
02= 32

Answer:

Total partial pressure, Pt = 821 mm Hg

Partial pressure of Helium, P1 = 105 mm Hg

Partial pressure of Nitrogen, P2 = 312 mm Hg

Partial pressure of Oxygen, P3 = ? mm Hg

According to Dalton's law of Partial pressures,

Pt = P1 + P2 + P3

So, P3 = 404 mm Hg

Half-life is a time in which the concentration of the substance gets reduced to 50% of the initial concentration. The number of tritium that will be left after 51 years is 0.624 kg.

Isotopes are chemical substances that have the same atomic number but different atomic mass because they have a different number of neutrons in the nuclei.

The half-life of the isotope, tritium is 12.3 years. Assuming we have 11 kg of substance and a number of years 51 years.

[tex]11 \times 2 ^{\frac{-51}{12.3}} = 0.6239 \;\rm kg[/tex]

Therefore, the number of tritium that will be left after 51 years is 0.624 kg.

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Chemical energy power cell growth, solar radiation power photosynthesis and is captured by chlorophyll, and carbon dioxide is released through cellular respiration.

During photosynthesis, solar radiation is captured by chlorophyll in green plants, and this is used to fix inorganic carbon dioxide and water to produce plant food in the form of carbohydrates.

During respiration, the carbohydrates synthesized via photosynthesis are broken down chemically to extract the energy locked in them. Carbon dioxide is produced as a by-product.

The energy extracted by respiration is used to power metabolic processes in plants.

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ΔH for the process is -252.3 cal/mol or -1056 j/mol.

A solid salt compound dissociates in liquid water to form an aqueous solution of its constituent ions.

This is a chemical reaction, with the required heat change at constant pressure termed the enthalpy of solution.

If this value is positive, then the final prepared solution will have a lower temperature than the starting pure solvent.

Conversely, a negative enthalpy value results in a solution temperature that is higher than the starting solvent temperature.

It is given that

NaOH (s) → Na (aq) + OH (aq)

mass of NaOH is 16.9 g

mass of water = 70 g

ΔT = 86.6-22.4 °C = 64.2 °C

q = m × Cg × ΔT

q = amount of energy released or absorbed

m = mass

Cg = specific heat capacity

ΔT = change in temperature

n = m ÷ M

n = moles of solute

m = mass of solute

M = molar mass of solute

ΔHsoln = q ÷ n

ΔHsoln = molar enthalpy (heat) of solution

q = amount of energy (heat) released or absorbed

n = moles of solute

Cg= 1 cal/gm/°C

Now substituting the values in the equation

q = m × Cg × ΔT

q = 16.9 * 1 * 64.2

q = 1085 cal

n = m ÷ M

M= 70/18=3.9

n=16.9/3.9

n=4.3

ΔH = q ÷ n

ΔH =1085 /4.3

ΔH= -252.3 cal/mol or -1056 j/mol

Therefore ΔH for the process

NaOH(s) → Na(aq) + OH(aq)

is -252.3 cal/mol or -1056 j/mol

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Answer:here:

Explanation:helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson (Og).

The cation part is named first in an ionic compound and the anionic part is named with the suffix of ate, id etc. The name of the ionic compound Pb (NO₃)₂ is lead nitrate.

Ionic compounds are formed between metals and nonmetals. Metals are electron rich and can easily lose electrons to form  positively charged ions called cations.

Non-metals with electron-deficiency will gain electron from the metals and acquires a negative charge to form anions. The electrostatic force of this negative clouds and positive cloud from the cation is called ionic bonding.

For ionic compounds, the cation or metals are named first. Pb is a metal with two valence electrons and NO₃ group has a negative charge. Thus, Pb donates its two electrons each to each nitrate groups and the anionic part nitrate is named last.

Therefore, the compound name is lead nitrate.

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Zinc nitrate has 1 molecule of zinc (Zn), 2 molecules of nitrogen (N) and 6 molecules of oxygen (O).

Calculate the molecular mass of zinc nitrate by adding the molecular weights for all molecules in the compound.

Here are the molecular weights for each element:

Zn=65.38 g/mol

N=14.01 g/mol

O=16.00 g/mol

The molecular weight of zinc nitrate is then: 1*(65.38)+2*(14.01)+6*(16.00)=189.40 g/mol.

Using a conversion formula to calculate moles of zinc nitrate:

163.97gZn(NO

3

​

)

2

​

∗

189.40gZn(NO

3

​

)

2

​

1molZn(NO

3

​

)

2

​

​

=0.866molZn(NO

3

​

)

2

​

There are 0.866 moles of zinc nitrate.

Note: These numbers may vary slightly due to the source of the molecular weight data and the number of decimal places used.

When silver nitrate reacts with potassium sulfate, the products would be silver sulfate and potassium nitrate.

The reaction between silver nitrate and potassium sulfate is a double replacement reaction that is represented by the following equation:

[tex]2 AgNO_3 + K_2SO_4 --- > Ag_2SO_4 + 2 KNO_3[/tex]

Thus, the products are silver sulfate ([tex]Ag_2SO_4[/tex]) and potassium nitrate ([tex]KNO_3[/tex]).

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Answer:

A

Explanation:

Answer:

Im pretty sure its B) 43

Explanation:

Explanation:

It's so because we know that stone is insoluble, ain't it, so it takes space in water & the water level rises.

But, when a spoon of sugar is added to water, it is soluble & hence mixes with water, so it doesn't rise.

I Hope this helps! (ㆁωㆁ)

The number of atoms of oxygen are present in 2.50 moles of sulfur dioxide is 30.110 × 10²³.

Avogadro's number is define as the number of atoms present in one mole of any substance and it is equal to 6.022 × 10²³.

In the 1 mole of SO₂ 2 moles of oxygen are present. So that in 2 moles of SO₂, 2(2.5) = 5 moles of oxygen is present.

No. of atoms of oxygen in 5 moles of oxygen will be calculated as:

No. of atoms = 5 mole × 6.022 × 10²³atoms per mole = 30.110 × 10²³atoms

Hence number of atoms of oxygen is 30.110 × 10²³.

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Answer:

There are 5! goodluck,

Explanation:

Answers:

1) Photons are absorbed by hot gas atoms.

2) Energy is transferred through large-scale movement of material.

3) Energy is released into the photosphere.

The Sun interior is divided into three regions: the inner core, the radiative zone and the convection zone.

The inner core is the central region of the Sun and all solar energy is produced in the core by nuclear fusion.

Radiative zone is around the inner core and in this area energy is transported by radiation.

The convection zone is the outer-most layer of the interior and in this area energy is transported by convection.

Answer: 6.559055381954511

Explanation:

751/760 x 1 atm = 0.988 atm

The best choice that explains why atoms of carbon-14 (c-14) are unstable is there are 2 more protons than neutrons in the nucleus

An atom is said to be stable if the number of neutrons in the nucleus is greater than number of protons in the nucleus, because the the neutrons increases the nuclear force which keeps the atom stable.

Thus, the best choice that explains why atoms of carbon-14 (c-14) are unstable is there are 2 more protons than neutrons in the nucleus.

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Answer:

D. there are 2 more neutrons than protons in the nucleus.

Explanation:

Answer: Hello! I'm Jungkook. Here is your answer.....

1 Atom.

Explanation:

Hope this helps! Anneyong/Bye!

xoxoKookie

A NaCl solution of 350 mL volume and a concentration of 0.277 M will contain 5.67 grams of the salt.

Recall that:

Mole = molarity x volume.

Also:

Mass = mole x molar mass

Hence;

Mole of 350 mL, 0.277 NaCl = 0.350 x 0.277 = 0.097 moles

Mass of 0.097 moles NaCl = 0.097 x 58.44 = 5.67 grams

Thus, a 350 mL, 0.277 M NaCl solution will contain 5.67 grams of the salt.

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Answer:

don't know what u mean by that

Explanation:

so help me

Answer:

There would be 25 moles

Explanation:

This is the equation for water (synthesis):

2H₂   +   O₂   →    2H₂O

Since there are 25 moles of water, the moles of hydrogen gas will have 25 moles.

[tex]\text{No. of moles } = \dfrac{\text{Mass of substance(C)} }{\text{Molar mass of substance(C)}}\\\\\\~~~~~~~~~~~~~~~~~~~=\dfrac{3.48}{12}~ \text{mol}\\\\\\~~~~~~~~~~~~~~~~~~~=0.29~ \text{mol}[/tex]

The pH of a solution that is 0.50 M in HCOOH is 2.045.

pH of the solution will be calculated by taking the negative logarithm of the concentration of H⁺ ion.

Given chemical reaction will be:

                            HCOOH(aq)   ⇄   H⁺(aq)   +   HCOO⁻(aq)

Initial:                         0.50                    0                    0

Equilibrium:              0.50-x                  x                    x

Given that, pKa = 3.75

Ka = [tex]10^{-pKa}[/tex]

Ka = [tex]10^{-3.75}[/tex] = 0.000178

Ka for the above equation will be written as:
Ka = [H⁺][HCOO⁻]/[HCOOH]

Ka = (x)² / (0.50-x)

x is negligible as compared to 0.5, so the equation becomes

0.000178 = (x)² / 0.50

x² = (0.000178)(0.5) = 0.000089

x = 0.009

[H⁺] = 0.009M

pH will be calculated as:

pH = -log(0.009) = -(-2.045) = 2.045

Hence pH of the solution is 2.045.

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Answer:

4 moles of H2

Explanation:

From the equation, twice as many

2 moles of O2   requires 4 moles of H2

1mol of Oxygen requires 2 moles of Hydrogen

Moles of Hydrogen

Answer:

The molecular weight of sodium sulfate is 142.1 g/mol. To calculate the mass of sodium sulfate, substitute the values in the formula. Therefore, the mass of sodium sulfate formed when we start with 200.0 grams of sodium hydroxide and you have excess sulphuric acid is 355.25g.

Answer: D. Alga

Explanation:

Answer:

The Arrhenius model

Explanation:

The Arrhenius state that an acid is a substance that contains hydrogen and ionizes to produce hydrogen ions in aqueous solution.

Approximately 0.36 grams of Cu are produced because copper (II) chloride acts as a limiting reactant.

A representation of a chemical reaction using symbols of the elements to indicate the amount of substance, usually in moles, of each reactant and product.

Based on the balanced equation of reaction and the reacting masses, approximately 0.36 grams of Cu are produced because copper (II) chloride acts as a limiting reactant.

The amount of copper produced is determined from the balanced equation of the reaction.

The equation of the reaction is given below:

3 CuCl₂ + 2 Al → 2 AlCl₃ + 3 Cu

molar mass of CuCl₂ = 132 g/mol

molar mass of Al = 27.0 g

molar mass of Cu = 64.0 g

moles of aluminium in 0.50 g = 0.50 / 27 = 0.018 moles

moles of CuCl₂ in 0.75 g = 0.75/132 = 0.00568 moles

Therefore, CuCl₂ is the limiting reactant

3 moles of CuCl₂ produces 3 moles of Cu

0.00568 moles of CuCl₂ will produce 0.00568 moles of Cu

Mass of 0.005  moles of Cu = 0.00568 * 64 = 0.36 g of Cu

Therefore, approximately 0.36 grams of Cu are produced because copper (II) chloride acts as a limiting reactant.

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Answer:

carbon nuclei...........

The natural types of greenhouse gases are more difficult to control and eliminate while the human-made type are easier.

Greenhouse gases are specific type of gases that have the ability to trap and release heat in their bonds.

Greenhouse gases are the cause of global warming, which is the gradual increase in temperature of the Earth's atmosphere.

However, greenhouse gases can either occur naturally or be synthesized artificially. The naturally-occuring greenhouse gases like CO2 are more difficult to control because they are not produced by humans.

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