Calculate the percent composition of hydrogen in C8H9NO2.

Molar mass is the ratio of the mass to that of the moles of the substance present in the compound. The mass of the oxygen required for the complete combustion is 0.091 gm.

Mass is the quantity or the weight of the substance occupied in the reaction and is the product of the molar mass and the moles of the substance.

The reaction for the combustion of propane can be shown as:

[tex]\rm C_{3}H_{8} + 5O_{2} \rightarrow 3CO_{2} + 4H_{2}O[/tex]

Moles of propane can be calculated as:

[tex]\begin{aligned}\rm moles &=\rm \dfrac{mass}{molar\; mass}\\\\&= \dfrac{0.025}{44.1}\\\\&= 5.66\times 10^{-4}\end{aligned}[/tex]

The ratio of the number of moles of propane and oxygen is 1:5. So the moles of oxygen will be [tex]2.83 \times 10^{-3}\;\rm mol[/tex].

Mass of oxygen can be calculated as:

[tex]\begin{aligned}\rm mass &= \rm molar\;mass \times mass\\\\&= 2.83 \times 10^{-3}\;\rm mol \times 32 \;\rm g/mol\\\\&= 0.091\;\rm gm\end{aligned}[/tex]

Therefore, option D. 0.091 gm is the mass of oxygen.

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Answer:

19.9 atoms

Explanation:

Grams --- Moles --- Atoms

You're converting from atoms (molecules) to moles.

You do not have to calculate the mass of "di phosphorus pentoxide."

Since you're already given 1.2x10^25 atoms, you start with that. You need to cancel out the atoms, so you need Avogadro's number as shown in the image.

(This has nothing to do with the problem) But in case if you're wondering, the "di" in phosphorus means there's 2 phosphorus and the "pent" means that there are 5 oxygens. So P2O5. Go to your periodic table, multiply their respective atomic masses. You would multiply phosphorus twice and oxygen 5 times. And add them up to get the overall mass.

I hope this helped!

tempreture

Explanation:

okay so the salt dissolved in the hot water because the hot water carried some latent heat and this latent heat was able to overcome and break the bonds of the salt therefore making it soluble whilst the cold water wasn't because it didn't have enough energy to overcome the bonds between the molecules of the salt

Answer:

both contains 6.02 x 1023 atoms

Explanation:

Pls, choose me as brainliest!

Answer:

342

g/mol

Explanation:

Just get out that Periodic Table of the Elements, find the atomic masses for each atom, and add them up!

Credit to "SCooke" (User)

Answer:

The element with electron configuration 1s² 2s² 2p⁶ will most likely not react with an element having seven Valence electrons.

The electron configuration of the element in discuss is 1s² 2s² 2p⁶.

The element has enough electrons to fill it's energy level, n = 2 shell.

In essence, the element in discuss is unreactive as it has attained it's octet configuration and as such is neither in need of an electron nor ready to donate an electron.

As such, although an atom having seven Valence electrons is highly electronegative and as such is an electron attractor, the element with the full octet configuration does not react with it.

This unreactive nature of noble gases is attributed to the full octet configuration of noble gases.

P.S: The electron configuration above is the electron configuration of Neon, Ne.

Answer:

See below, please

Explanation:

Because the mole ratio

[tex] \frac{m(ch4)}{m(o2)} = \frac{1}{2} [/tex]

Now, at the beginning

Mole m(CH4) =4 mol, m(O2) = 5 mol

If O2 gas is fully reacted, used up,

Need m(CH4) = 2.5 mol

Hence, the mole of CH4 left

m(CH4) = 4-2.5=1.5 mol

That means

At the end of the reaction,

m(CH4) =1.5 mol

m(O2) = 0 mol

Answer:

The Temperature will Increase, and the fire will Blow

Explanation:

I hope I could help

Answer:

a, c, and d

Explanation:

Gamma rays, x-rays, an ultraviolet (UV) waves have more energy than visible light.

Answer:

Gamma rays, X - rays and ultraviolet ray

Explanation:

High energy waves have high frequency

Answer:

Carbon comes from the air and soil, hydrogen comes from absorbing water, H20, and breaking it down into Hydrogen and oxygen :) (also where oxygen comes from)

Explanation:

0.34 moles of gas would be contained in a 11.2 L container that is at a pressure of 0.75 atm and 300 K.

The number of moles of a substance can be calculated using the following expression:

PV = nRT

Where;

0.75 × 11.2 = n × 0.0821 × 300

8.4 = 24.63n

n = 8.4 ÷ 24.63

n = 0.34 moles

Therefore, 0.34 moles of gas would be contained in a 11.2 L container that is at a pressure of 0.75 atm and 300 K.

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The answer is  longitudinal waves

Answer:

they pull or push on objects without touching them

Explanation:

i think the answer would be 77 grams

Answer:

Hello there buddy

I believe your answer is

6.6656536

Hope it’s helps you buddy :)

Explanation:

~AwesomeJayden

The percentage yield for the reaction between [tex]Li_3 N_{(s)}[/tex] and [tex]H_2[/tex], which resulted in the production of [tex]LiH_{(s)}[/tex], is 25%.

To calculate the per cent yield, we multiply the theoretical yield by 100.

There can be a significant difference in the theoretical and actual yield.

Li₃N(s) + 2 H₂(g) ⇄ LiNH₂(s) + 2 LiH(s)

[tex]70 g Li_3N *\frac{ 1 mol Li_3 N}{35 g} = 2 mol Li_3N\\2 mol Li_3N * \frac{2 mol LiH}{1 mol Li_3N} \\4 mol LiH * \frac{7.05 g LiH}{ 1mol LiH} = 28.20[/tex]

Percentage yield = [tex]\frac{Actual Yield}{Theoretical Yield} * 100[/tex]

[tex]\frac{8.0g}{28.20 g}[/tex] ≅ 25

From the above calculation, we found that the per cent yield is closest to 25%.

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Your question is incomplete, the probable question is:

Li₃N(s) + 2 H₂(g) ⇄ LiNH₂(s) + 2 LiH(s) ΔH° = -192 kJ/molrxn Because pure H₂ is a hazardous substance, safer and more cost-effective techniques to store it as a solid for shipping purposes have been developed. One such method is the reaction represented above, which occurs at 200 °C. When 70 g of [tex]Li_3N_{(s)}[/tex] (molar mass 35 g/mol) reacts with excess H₂(g), 8.0 g of LiH(s) is produced. The per cent yield is closest to:

The equilibrium concentration of H2 and I2 is 0.165 M. The equilibrium concentration of HI is 1.17 M.

The term Kc refers to the equilibrium constant for a aqueous phase reaction. The concentrations of each specie is;

H2 = 1.5/2 = 0.75 M

I2 = 1.5/2  = 0.75 M

Setting up the ICE table;

        H2(g) +     I2(g) <---> 2HI(g)

I      0.75          0.75             0

C     -x                -x                 +2x

E    0.75 - x     0.75 - x           2x

Kc = [HI]^2/[H2] [I2]

57.85 = (2x)^2/(0.75 - x)^2

57.85(0.56 - 1.5x + x^2) = 4x^2

32.3 - 86.7x + 57.85x^2 = 4x^2

4x^2 - 57.85x^2 + 86.7x - 32.3 = 0

-53.85x^2 + 86.7x - 32.3 = 0

x = 0.585 M because x can not be greater than the initial concentration.

At equilibrium;

[HI] = 2x = 2(0.585) = 1.17 M

[H2] =[I2] = 0.75 M  - 0.585 M = 0.165 M

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Answer:

Atom is the part of an element

Explanation:

A particular element is composed of only one type of atom

Answer:

KI (potassium iodide) is a salt of stable (not radioactive) iodine that can help block radioactive iodine from being absorbed by the thyroid gland, thus protecting this gland from radiation injury. The thyroid gland is the part of the body that is most sensitive to radioactive iodine.

Happy To Help !!!

Based on the Ka and Kb values of the reactants, the Kc value of the given reaction is greater than 1.

The acid dissociation constant, Ka, of HSO4- is 1.2 × 10^-2.

The base dissociation constant, Kb for CH3CO2- is 5.6 × 10^-10

The given equation of reaction is as follows:

Substituting the Ka and Kb values:

Kc = 1.2 × 10^-2/5.6 × 10^-10

Kc = 2.14 × 10^7

Therefore, the Kc value of the given reaction is greater than 1.

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The balloon expands above the candle  but contracts in a bucket of ice.

According to the kinetic theory, gases are composed of molecules which are in constant random motion. Temperature is a measure of the average kinetic energy of the molecules of the gas.

If a balloon is held above a burning candle, the gas in the balloon expands according to Charles law. This is because, the molecules of the gas receive more energy, move faster and spread out.

When the balloon is placed in a bucket of ice. The molecules of the gas loose energy and contract hence the balloon shrinks.

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Answer:

Part 1: The balloon will expand because molecules in the gas are receiving more energy (heat), and are now moving faster and spreading out.

part 2: The balloon will contract since the molecules are losing the energy that was gained by the candle.

Explanation:

Explanation:

charged particles=8 which is proton and proton=no.of electron. That's why 8 particles are revolving round this center. And this atom structure is of oxygen

If the center of an atom has 8 charged particles that are protons as the neutrons are neutral there will be 8 negative charges that are electrons revolving around the center nucleus.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether it is  solid,liquid or  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 particles  and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged  particles and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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mol FeCl₂ = mass : molar mass = 507 : 127 = 3.992

mol NaCl = 2/1 x mol FeCl₂ = 2/1 x 3.992 = 7.984

mass NaCl = 7.984 x 58.5 = 467.06

closest to C. 467.52 g NaCl

507 g of FeCl₂ produced amount of NaCl is equal to 467.52 grams. Therefore, option (C) is correct.

The balanced chemical equation in which the number of atoms of each element is equal on either side of the chemical equation of the reaction.

The law of conservation of mass follows by a balancing of a chemical equation by which the total mass of the reactants must be equal to the total mass of the products.

Given, the balanced chemical reaction of iron (II) chloride and NaOH:

[tex]FeCl_2 + 2NaOH \longrightarrow Fe(OH)_2(s) + 2NaCl[/tex]

Given, the mass of the FeCl₂= 507 g

The molar mass of FeCl₂ and NaCl is 126.75 g/mol and 58.44 g/mol respectively.

126.75 g of FeCl₂ produced amount of NaCl = 2 × 58.44 g

507 g of FeCl₂ produced NaCl = (116.88/126.75) ×507 = 467.52 g

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Answer:

sorry but can i get the question? cause it is not there

If a sodium citrate sample for coagulation is noted to be filled an inch below the fill line, then the specimen is considered unacceptable for coagulation studies. It alters the properties of blood.

Blood coagulation (clotting) is a natural process by which blood cells form a gel known as a blood clot.

The blood clot generates a protective barrier against the entry of harmful substances inside the body.

Sodium citrate can be used in coagulation studies because blood factors V and VIII are relatively more stable in media that contain this substance.

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% composition = Ar/Mr x 100%

MM (molar mass) ZnSO₄ = 161 g/mol

AM (atomic mass) Zn = 65.38 g/mol

% Zn = 65.38/161 x 100% = 40.6%

AM (atomic mass) S = 32 g/mol

% Zn = 32/161 x 100% = 19.9%

AM (atomic mass) O = 16 g/mol

% Zn = 4.16/161 x 100% = 39.6%

Answer:

the ball starts moving

the energy changes