please answer quick please, im have a test

Answer:

2.25 moles H2

Explanation:

The equation N2+ 3H2 > 2NH3

1 mol of N2 gives 3 mol of H2

Then

. 75 mole N2 give 3*.75 = 2.25 moles of H2

Answer:

22.2 g of MgF₂

Explanation:

We star from the reaction:

NaF → sodium fluoride

Mg → Magnesium

2NaF  +  Mg →  MgF₂  +  2Na

2 moles of sodium fluoride react to 1 mol of Mg in order to produce 1 mol of magnesium fluoride and 2 moles of sodium.

We convert mass of the reactant to moles:

30 g . 1mol / 41.98 g = 0.715 mol

We assume that Mg is in excess

As ratio is 2:1, if we have 0.715 moles of NaF we may produce the half of moles, of MgF₂

0.715 mol /2 = 0.357 moles of MgF₂

We convert moles to mass: 0.357 mol . 62.30g /mol = 22.2 g

Answer:

Tbe reddish brown substance might be the rust that formed overtime in a iron tap and over the course of time mixed with other dust and particles it might have formed another substance .

The reddish brown substance is iron oxide which is formed by the reaction of iron materials with water and air. This oxide layer above the surface of metallic parts is called rust.

The Fe is a reddish metal more reactive towards the air and water as well. Fe is a very common in the manufacturing of many household materials. However, by the action of air and water these metallic parts undergo corrosion.

Corrosion is a chemical change involving the formation of oxide layer over the metallic surface which eventually corrode the substance and make it unusable.

Fe reacts with oxygen of water or air forming the reddish brown iron oxide Fe₂O₃ that is what called the rust. Rust can be seen in needles, vehicle parts made of iron etc.

Find more on corrosion:

https://brainly.com/question/28302789

#SPJ2

Answer:

A.

Explanation:

This is the closest to what Ptolemy drew.

B would have the sun and moon in equal orbits, but the moon changes wouldn't be accounted for

C and D have the sun in the middle, so they are both heliocentric.

The diagram that correctly shows the orbits of the Sun, Earth, and Moon in the geocentric model of the solar system is A and the correct option is option A.

In the geocentric model of the solar system, the Earth is considered to be the center of the solar system.

The Moon, the planets, the Sun, and the stars all rotate around the Earth (which stays still), with uniform circular motion. They compose the heavens, which are considered to be ethereal and unchanging.

Therefore, the diagram that correctly shows the orbits of the Sun, Earth, and Moon in the geocentric model of the solar system is A and the correct option is option A.

Learn more about Geocentric Model of Solar System, here:

https://brainly.com/question/28608924

#SPJ3

Answer:

1. C

2. B

3. B

4. Graph b, option D

Explanation:

Answer:

11. chloroplasts and a cell wall

17. microbes

1. increased

2. Graph b

Explanation:

I put them in the order u asked the questions btw.

Answer:

[tex]4.08x10^{25} molecules[/tex]

Explanation:

Hello there!

In this case, since the understanding of the mole-molecules relationships is analyzed via the Avogadro's number:

[tex]1mol=6.022x10^{23}molecules[/tex]

Next, we can solve the following setup by starting with the 67.8 moles of helium and obtaining the required molecules as follows:

[tex]67.8mol*\frac{6.022x10^{23}molecules}{1mol}\\\\=4.08x10^{25} molecules[/tex]

Best regards!

Answer:

9.00 g H2O

Explanation:

Convert molecules to grams using stoichiometry

(3.01 * 10^23 molecules) * (1 mole H2O / 6.022 * 10^23 molecules) * (18.01 g / 1 mole H2O) = 9.00 g H2O

Answer:

answer  in picture

Explanation:

Answer:

i think it is a the full moon

Answer:

n = Initial volume/22.4L

Explanation:

The molar concept is simply one that is used to find the Number of moles and explain the relationship it has with avogadro's number, molecular mass, molar mass e.t.c.

Now, in terms of molar mass, number of moles is given by the formula;

n = mass of the sample/molar mass

In terms of avogadro's number, number of moles is;

1 mole = avogadro's number = 6.02 × 10^(23)

Now, when dealing with ideal gases, the molar volume of an ideal gas is 22.4 L.

Now the relationship between this volume and the mole concept is that the number of moles is gotten by dividing the initial volume by this molar volume.

Thus;

n = Initial volume/22.4L

Answer:

105Comprendes las leyes de la electricidadAprende másClasificación de los materialesUn medio o material que permite el movimiento de las cargas eléctricas (electrones) en respuesta a una fuerza eléctrica, se denomina conductor. Los materiales conductores son los que se pueden electrizar en toda su superficie, debido a que los electrones se mueven libremente. Los metales por lo general son buenos conductores de la electricidad.El flujo de las partículas cargadas es lo que se conoce como corriente eléctrica. Las partículas cargadas en una cierta dirección de un conductor chocan con los átomos, produciendo una pérdida de energía que se manifiesta en forma de calor.Una medida de oposición que presentan las partículas cargadas al moverse libre-mente en una cierta dirección de un material conductor es lo que se conoce como resistencia eléctrica.Los materiales que no permiten que las partículas cargadas se muevan hacia otra región del material a una fuerza eléctrica, son llamados aislantespor ejemplo, la madera.Existen otros tipos de materiales cuyas propiedades son intermedias entre los conductores y aislantes; se llaman semiconductores.Algunos ejemplos de materiales con estas características son:

Explanation:

Answer:

Greenhouse gases in the atmosphere absorb heat radiation. Human activity has increased greenhouse gases in the atmosphere since the Industrial Revolution, leading to more heat retention and an increase in surface temperatures.

Answer:

17.2mL are needed

Explanation:

The pH curve for titration of 50.0 mL of a 0.100 M solution of hydrochloric acid

A strong acid as HCl reacts with a strong base as NaOH producing water and a salt. The chemical equation is:

HCl + NaOH → H₂O + NaCl

Where 1 mole of HCl reacts per mole of NaOH

To solve this question we must find the moles of HCl added = Moles NaOH you must add to reach the equivalence point. With these moles and the molar concentration we can find the volume that would be needed as follows:

Moles HCl:

50.0mL = 0.0500L * (0.100moles / L) = 0.00500 moles HCl = Moles NaOH

Volume NaOH:

0.00500 moles NaOH * (1L / 0.290moles) = 0.0172L NaOH =

Answer: Gasoline

Explanation: Siri said so

The non-aqueous means it does not contain water. Among the given options gasoline is an example of a non-aqueous solution. The correct option is A.

The solution which is obtained by dissolving solute in any liquid other than water is defined as the non-aqueous solution. If solute is dissolved in solvent like benzene, alcohol, ether, carbon disulphide, acetone etc. forms a non aqueous solution.

The major difference between the aqueous and non-aqueous solution is that the solvent of an aqueous solution is water whereas in non-aqueous solutions, the solvent is any substance other than water.

The solvent of non-aqueous solution can be polar or nonpolar and depending on the polarity the solutes dissolve in the solvent. Here gasoline is an example of the non-aqueous solution. The gasoline is a crude oil which does not include water as an ingredient.

Thus the correct option is A.

To know more about non-aqueous solution, visit;

https://brainly.com/question/4992250

#SPJ7

Answer:

The molecular mass of carbon dioxide is 44.01amu

Answer:

the steel knife, because it's metal.

Answer:

The particle theory states that the particles of a substance spread out as they gain energy when heated. Thus, the particles take up more space, which means that the density of the substance decreases. It is almost always true that, for each pure sub­ stance (for example, gold), the density of its solid state is greater than the density

Explanation:

Answer: let me see I gotta do the work first then I’ll give you the answers

Explanation:

Answer:

1) C₃H₄N

Explanation:

The empirical formula of a compound is the formula that gives the positive integer ratio of the atoms of the elements in the compound in the simplest form

The mass of carbon in the compound = 90 grams

The molar mass of carbon = 12.011 g/mol

The number of moles of carbon = 90 g/(12.011 g/mol) ≈ 7.4931313 moles

The mass of hydrogen in the compound = 11 grams

The molar mass of hydrogen = 1.00794 g/mol

The number of moles of carbon = 11 g/(1.00794 g/mol) ≈ 10.913348 moles

The mass of nitrogen in the compound = 35 grams

The molar mass of nitrogen = 14.0067 g/mol

The number of moles of carbon = 35 g/(14.0067 g/mol) ≈ 2.49880414 moles

Dividing by the smallest mole ratio gives;

The proportion of carbon, C = 7.4931313/2.49880414 = 2.9987 ≈ 3

The proportion of nitrogen, N = 10.913348 /2.49880414 = 4.367 ≈ 4

The proportion of nitrogen, N = 2.49880414 /2.49880414 = 1

Therefore, the empirical formula of the compound is C₃H₄N.

Answer:

1) C₃H₄N

Explanation:

took test

Answer:

Electron

Explanation:

Answer:

bR2 since it is nonpolar

Answer:

AlI3 is the chemical formula and the name of compound is Aluminium iodide.