mass of N in 0.464g of N2H4

Answer: 2:3

Explanation: The question is phrased annoyingly. NH3 to H2 means we need to keep our numbers correct.

2NH3 -> 2 mol of NH3.

3H2 -> 3 mol H2.

NH3/H2 = NH3 to H2.

2:3.

2 mol NH3

----------------

3 mol H2.

2:3, not 3:2.

Two moles or 78 g of potassium metal reacts with water to give one mole or 2 grams of hydrogen gas. Then 20 g of K will give 0.51 g of hydrogen gas.

Metals especially alkali metals and alkaline earth metals are highly reactive towards air and water. By reacting with water these metals produces their corresponding hydroxides.

Potassium reacts with water forms KOH as written below:

[tex]\rm 2K + 2H_{2}O \rightarrow 2 KOH + H_{2}[/tex]

As per this reaction, 2 moles of K produces 1 mole of hydrogen

atomic mass of K = 39 g/mol

mass of 2 K = 78 g

mass of H₂ = 2g

Then mass of H₂ produced from 20 g of K is:

mass of H₂ = (20 × 2) /78 = 0.51 g

Therefore, 0.51 g of hydrogen gas is produced by 20 grams of potassium metal.

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Answer:

Explanation:

An anion is a negatively charged ion, meaning it has gained one or more electrons. A cation is a positively charged ion, meaning it has lost one or more electrons. The charge of an ion can be determined by its atomic number, the number of protons it contains, and the number of electrons it contains. An anion will have more electrons than protons and a cation will have more protons than electrons. An anion will be attracted to positive charges, while a cation will be attracted to negative charges. Anions and cations can also be compared based on their size and shape. Anions are typically larger than cations, and they often have a spherical shape. Cations, on the other hand, are typically smaller and have a more angular shape.

Answer:7.3

Explanation:

The power sector is targeted for the application of hydrogen fuel cells.

This type of fuel produces electricity through the combination of hydrogen and oxygen atoms. The hydrogen reacts with oxygen across an electrochemical cell and produces electricity, water, and heat in a very small quantity.

Hydrogen-powered fuel cell electric vehicles doesn't have any carbon emission or greenhouse gases such as carbon dioxide etc which depletes the ozone layer and causes global warming.

It emit none of these harmful substance and only emits water and warm air which makes it a very clean fuel thereby causing a reduction in pollution and reducing the risk of respiratory diseases.

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Answer:

Explanation:

5.342 x 10 the power of 7

The mole fraction of oxygen in the cylinder, given that the cylinder contains 8.2 moles of oxygen and 8.22 moles of lead is 0.499

Mole fraction is simply defined as:

Mole fraction of subtance = Mole of sunstance / total mole

Next, we shall determine the total mole in the cylinder. Details below:

Total mole = Mole of oxygen + mole of lead

Total mole = 8.2 + 8.22

Total mole = 16.42 moles

Finally, we shall determine the mole fraction of oxygen in the cylinder. Details below:

Mole fraction of oxygen = mole of oxygen / Total mole

Mole fraction of oxygen = 8.2 / 16.42

Mole fraction of oxygen = 0.499

Thus, we can conclude from the calcultions made above that the mole fraction of oxygen is 0.499

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Complete question:

A cylinder contains 8.2 mol of oxygen and 8.22 mol of lead. What is the mole fraction of oxygen in the cylinder?

The percentage of red glass beads would be = 16.67%

Percentage is defined as the part of a portion of a value per 100 and it is represented by the symbol %.

The number of red colored glass beads = 25

The total number of glass beads = 150

The percentage of glass beads that are red colored glass would be;

= 25/150×100

= 2500/150

= 16.67%

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If a certain ore is 21.3% nickel by mass. The number of kilograms of this ore would you need to dig up to have 20.0 g of nickel is: 93.897 kg.

Using this formula to determine the  mass of ore

Mass of ore = Mass of nickel / Percentage of nickel by mass

Convert the percentage to decimal form by dividing it by 100

0.213 = 21.3%.

So,

Mass of ore = (20.0 g) / (0.213)

Mass of ore = 93.897 kg

Therefore the  mass of ore is 93.897 kg.

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IUPAC named for the compound shown here is 1- hydroxyl, 3- ethyl, hexane.

The International Union of Pure and Applied Chemistry is full form of IUPAC. It is important because it creates a standardized way to name chemical compounds in organic chemistry.

The International Union of Pure and Applied Chemistry recommends using the IUPAC nomenclature of organic chemistry to name organic chemical substances.

The rule of the first point of difference states that the series that includes the lowest number when the first difference occurs is the "lowest."

Thus, IUPAC named for the compound shown here is 1- hydroxyl, 3- ethyl, hexane.

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6) The constant is the amount of beverage in each sample. Option C

7) Greater amount of carbon dioxide dissolve at lower temperatures

8) It shows that the hypothesis should be thrown away. Option D

9) The independent variable is the temperature. Option B

When we talk about an experiment, then we would have to look at the interplay of one or more variables. It is common that when we are doing an experiment, the dependent variable would have to interface with the independent variable.

We can see that in the experiment, we are trying to find out the impact of the temperature on the mass of the carbon dioxide.

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Answer:

In X2​O3​,. Percentage of oxygen by weight = 31.58. Percentage of X by weight = 68.42. Let the atomic weight of X = x. 2x+482x​×100 = 68.42. ∴ x = 51.99.

Explanation/solution in image

Answer:

11000

Explanation:

85.3 has 3 significant figures

21.489 has 5 significant figures

0.0059 has 2 significant figures ( as zeros on the left are not significant)

The answer is always rounded off to the least number of decimal places given in the question. Here the least number is two significant figures.

Therefore;

(85.3 - 21.489)/0.0059

= (63.811)/0.0059

= 10815.42

As we have to round off the answer to two significant figures:

= 11000

The pressure of a gas is directly proportional to its temperature and inversely proportional to its volume.

PV/T = PV/T

(1.00atm * 3.5 L)/ 273k = (P * 0.50L)/(39.1 + 273k)
Do some simple algebra and you will get
P = 8.0 (Note that there should be 2 sigfigs)

Accidental cosmic background radiation, remarkably uniform, billions of years ago.

what is radiation ?

Radiation is a form of energy that is emitted in the form of waves or particles. It is an invisible form of energy that travels through space. Radiation is present everywhere in the environment and is emitted from many sources, both natural and man-made.

Natural sources of radiation include the sun, rocks, soil, and the air. Man-made sources include nuclear power plants, medical devices, and X-ray machines. There are several forms of radiation including alpha, beta, and gamma radiation. Alpha radiation is made up of particles, while beta and gamma radiation consists of electromagnetic waves. Different types of radiation have different properties that make them useful in various applications. For example, gamma radiation is used in medical imaging.

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Answer:

The molar mass of an unknown gas can be determined using the concept of effusion. Effusion is the process of a gas passing through a small hole or porous partition. The rate of effusion of a gas is inversely proportional to the square root of its molar mass. This relationship is described by the Graham's law of effusion.

Explanation:

Graham's law of effusion states that the rate of effusion of a gas is inversely proportional to the square root of its molar mass.

R = k √M

Where R is the rate of effusion, k is a constant, and M is the molar mass of the gas.

If we know the rate of effusion of COCl2 and the rate of effusion of an unknown gas and we know that the unknown gas effuses at a rate 1.5 times the rate of COCl2.

R unknown = 1.5 * R COCl2

We can use this information to find the molar mass of the unknown gas.

M = (R COCl2 / (1.5 * R unknown) )²

If we know the molar mass of COCl2, we can substitute it in the equation and solve for the molar mass of the unknown gas.

It's worth noting that this problem requires you to know the molar mass of COCl2 which is not provided in the question. And also it's important to know that the values of the constant k in the equation for the different gases are not the same, so you need to use the same gas as reference.

1. The mass of8.12 × 10²⁴ atoms of Co is 4.77 × 10^25 g.

2. There are 2.24 x 10²² atoms of carbon in 4.08g of aspirin.

To calculate the mass of 8.12 × 10²⁴ atoms of Co in grams, we need to know the atomic mass of cobalt (Co) in grams per mole. According to the periodic table, the atomic mass of Co is 58.93 g/mol.

We can calculate the mass of 8.12 × 10²⁴ atoms of Co by using the formula:

mass = (number of atoms) x (atomic mass)

mass = (8.12 × 10²⁴ atoms) x (58.93 g/mol)

mass = 4.77 × 10²⁵ g

So, the mass of 8.12 × 10²⁴ atoms of Co is 4.77 × 10²⁵ g.

Aspirin, also known as acetylsalicylic acid, has the chemical formula C9H8O4. To find out how many carbon atoms there are in 4.08g of aspirin, we can use the formula:

(Mass of aspirin) / (molar mass of aspirin) x (number of moles of C in aspirin)

We know the mass of aspirin is 4.08g and we can look up the molar mass of aspirin, which is 180.159 g/mol. To find the number of moles of C in aspirin, we can count the number of C atoms in the formula of aspirin which is 9 atoms, and then multiply that number by Avogadro's number, which is 6.022 x 10^23 atoms/mol.

So the number of carbon atoms in 4.08g of aspirin is:

4.08g / 180.159 g/mol * (9 atoms × 6.022 x 10²³ atoms/mol) = 2.24 x 10²² atoms

So there are 2.24 x 10²² atoms of carbon in 4.08g of aspirin.

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Answer:

C

Explanation:

because its the answer

Answer:

acids

Explanation:

acids because if the rain comes from cloud is acid it can be weathered or if the water is slightly acidic

Answer: a) ions and b) ions

Explanation:

The Method of Mixtures Electrical Method is a method used to determine the electrical conductivity of a material.

The Electrical Method is a geophysical prospecting technique that uses electrical resistivity to map subsurface features, such as geological structures, fractures, and mineral deposits.

It involves measuring the amount of current that passes through a mixture of two materials under the application of a known voltage. The electrical conductivity of each material can then be determined by calculating the ratio of the current to the applied voltage. The electrical conductivity obtained from the Method of Mixtures Electrical Method can be used to characterize materials such as semiconductors and insulators.

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The thermochemical equation for this reaction by calculating its thermal effect is H₂S +CO₂ = CS₂ + water vapor.

Thermochemical equations are balanced chemical equations that contain all reactants and products' physical states as well as the energy change. The reaction is endothermic when energy is a reactant, but exothermic when energy is a product.

A thermochemical equation is a stoichiometric chemical equation with a balanced enthalpy change, H. A thermochemical equation in variable form would look like this: A + BC.

Therefore, the thermochemical reaction is H₂S +CO₂ = CS₂ + water vapor.

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Answer: 31.2 g

Explanation: Given,

2.40 x 10^23 molecules of SO3

number of moles (n) = given number of molecules / total number of molecules

n = 2.4 x10^23/ 6.023 x 10^23

n = 0.39 moles

mass  = molecular mass x number of moles(n)

mass in grams  = 80 (Molecular mass of SO3) x 0.39

mass in grams  = 31.2 g

The majority of metals are malleable, meaning they can be bent and moulded without breaking.

define moulding ?

architect a shaped outline, especially one used on cornices, etc.

a formed strip of wood, stone, or other material

a moulded item, a decorative recessed or relieved surface, a decorative plane or curved strip for embellishment or finishing

The majority of metals are malleable, meaning they can be bent and moulded without breaking. This is due to the fact that they are made up of layers of ions that can glide over one another when the metal is twisted, hammered, or pushed. Most metals are ductile because the ions slide over one other and may be drawn/pulled into wires, making them excellent for electric cables.

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An example of a biotic factor of an aquarium ecosystem is an  algae growing on the glass. Option B is the correct answer.

This refers to a living organism that shapes its environment. The examples of biotic factor that make up fresh water ecosystem are: aquatic plants, fish, amphibians,fungi, bacteria, and protists. and algae.

The biotic factors are gropped into : producers, consumers, and decomposers.

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Answer:

The number of moles of HBr required to react with 2 g of propyne can be calculated by using the balanced chemical equation:

C3 H4 + 2HBr → C3 H6 Br2

The molar mass of propyne is (3 x 12 + 4 x 1) = 40 g/mol

So, 2 g of propyne is equal to 2/40 = 0.05 moles of propyne.

Since 2 moles of HBr are required to react with 1 mole of propyne, then 0.05 moles of propyne would require 0.05 x 2 = 0.1 moles of HBr.

Finally, to find the number of grams of HBr, we multiply the number of moles by its molar mass, which is (1 x 1 + 80 x 1) = 81 g/mol

So, 0.1 moles of HBr is equal to 0.1 x 81 = 8.1 g of HBr.

The two mentioned gases have the same number of atoms as they are present at STP.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

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According to the question, Equivalent volume of any gas at STP is 22.4 litre. So, Equivalent volume of hydrogen, will be 22.4 litre. ​Equivalent wt. of metal= 0.025gm

Hydrogen may be utilized to heat our dwellings and places of business in addition to powering vehicles and producing electricity. To reach net zero, it will be crucial to reduce our carbon emissions significantly.

The majority of stars and the sun include it, and the planetary Jupiter is primarily made of it. Less than consistent with similar per million per volume is all that is found when it is a gas present in the air.

​Equivalent wt. of metal/Weight of metal =moles of  [tex]H_{2}[/tex] ×valency factor

​Equivalent wt. of metal/ 1.017 g = (0.28 L/22.4 L) ×2

​Equivalent wt. of metal= 0.025gm

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The bond length for NH3, NF3, and PF3 can be compared based on their molecular geometry and the strength of the chemical bonds between the atoms.

NH3 has a bond angle of 107 degrees and a bond length of 1.01 Angstroms. This is due to the presence of a lone pair of electrons on the Nitrogen atom which causes the bond angles to deviate from the ideal tetrahedral angles of 109.5 degrees.

NF3 has a bond angle of 107 degrees and a bond length of 1.1 Angstroms. This is due to the presence of a lone pair of electrons on the Nitrogen atom which causes the bond angles to deviate from the ideal tetrahedral angles of 109.5 degrees.

PF3 has a bond angle of about 101 degrees and a bond length of 1.48 Angstroms. This is due to the fact that the Fluorine atoms are larger than the Nitrogen atoms of NH3 and NF3, and the bond between Phosphorus and Fluorine is stronger and shorter than the bond between Nitrogen and Hydrogen or Nitrogen and Fluorine.

In summary, the bond length of NH3 and NF3 is shorter than that of PF3 due to the smaller size of Nitrogen atoms compared to Phosphorus and the presence of lone pairs on Nitrogen atoms. The bond between Nitrogen and Hydrogen or Nitrogen and Fluorine is weaker than the bond between Phosphorus and Fluorine.

The vapor pressure at 85.0°C of a solution prepared by dissolving 0.300 mol of liquid dibromoethane the vapor pressure at 85.0°C of a solution prepared by dissolving 0.300 mol of liquid dibromoethane is 164.83 torr.

The term vapor pressure is defined as the tendency of a material to change into the vapour state, and it increases with temperature.

For calculating mole fraction of C₂H₄Br₂ as follows

X C₂H₄Br₂ = moles of C₂H₄Br₂ / moles of C₂H₄Br₂ + moles of C₃H₆Br₂

= 0.3 / 0.3 + 1.80

= 0.14

For calculating mole fraction of C₃H₆Br₂ as follows:

XC₃H₆Br₂ =  moles of C₃H₆Br₂ / moles of C₂H₄Br₂ + moles of C₃H₆Br₂

= 1.80 / 2.1

= 0.85

For calculating total vapor pressure as follows:

P total = [ ( 0.14 × 127) + (0.85 × 173) ]

= 17.78 + 147.05

= 164.83 torr

Thus, The vapor pressure at 85.0°C of a solution prepared by dissolving 0.300 mol of liquid dibromoethane the vapor pressure at 85.0°C of a solution prepared by dissolving 0.300 mol of liquid dibromoethane is 164.83 torr.

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Concentration of 20cm³ of sulphuric acid that neutralize 25cm³ of 0.100M of KOH, basically is NaOH. 2NaOH + H2SO4 → Na2SO4 + H2O.

What is sulphuric acid?

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