Calculate the molarity of 0. 5 moles NaHCO3 in 3,691 mL of solution

Answer:

our search - If NaCl has a solubility of 36. 0 g in 100. G of H2O at 20∘C, how many grams of water are ... - did not match any news results.

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Explanation:

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

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:

Answer:

d. Temperature of the liquid

Explanation:

The viscosity of a fluid is determined by temperature, pressure (at very high values), and concentration. The viscosity of a fluid reduces as the temperature rises, resulting in an increase in molecular mobility. When high pressure is applied, it has a minor effect on pressure. The viscosity and concentration have a direct relationship.

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:

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:

2.82*10^23

Explanation:

please see attached for work!

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 !!!

Answer:

Given, Mass of an object, m = 2kg

velocity, v = 2m/s

We have,

KE = 1/2 m v²

= 1/2 × 2 (2)²

= 1/2 × 8

= 4J

Hence, 4J is the required Kinetic energy.

Answer:

explanation:

Buffer solutions resist a change in pH when small amounts of a strong acid or a strong base are added.

Answer:

react with acid that is added and make a base

Explanation:

Buffer solutions are made when a solution of weak acid is mixed with its conjugate base.

Here the buffer solution will react with the strong acid .

Answer:

they pull or push on objects without touching them

Explanation:

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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Answer:

both contains 6.02 x 1023 atoms

Explanation:

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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

Answer:

The Temperature will Increase, and the fire will Blow

Explanation:

I hope I could help

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:

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:

it's hydrogen

Explanation:

ig it's correct

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:

3 to 4 days is how long you can keep cooked beef in the refrigerator

Wave Current run parallel to the beach and carry particles from one place and deposit it to another place.

Wave current is the movement of large water particles in all directions which is created by strong wind . Currents can be temporary or long-lasting. It can occur near the surface or in the deep ocean. It carries particles from one place and deposit it to another place.

Therefore, Wave Current run parallel to the beach and carry particles from one place and deposit it to another place.

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Answer:

1. The mass of the reactants must be equal to the mass of the products. The total number of moles of the reactants can be more or less than the total number of moles of the products.

2. Divide the mass of the reactant by its molar mass to find the number of moles of the reactant. Use the chemical equation to find the number of moles of the product. Multiply the number of moles of the product by its molar mass to find the mass of the product.

3. 2(108 g/mol)+32 g/mol=248 g/mol; (248 g/mol)(0.02 mol)=4.96 g

4. 19.5 g

5. 853.5 g

Explanation:

Quick Check 5/5

Multiply the number of moles of the product by its molar mass to find the mass of the product. Therefore, the correct option is option C.

A body's mass is an inherent quality. Prior to the advent of the atom as well as particle physics, it was widely considered to be tied to the amount of matter inside a physical body.

A student knows the mass of one of the reactants of a chemical reaction and wants to calculate the mass of one of the products of the reaction. Divide the mass of the reactant by its molar mass to find the number of moles of the reactant. Use the chemical equation to find the number of moles of the product. Multiply the number of moles of the product by its molar mass to find the mass of the product.

Therefore, the correct option is option C.

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Answer:

A. Do not change their energy level.

Explanation:

The process in which a solid changes directly to a gas is called sublimation. It occurs when the particles of a solid absorb enough energy to completely overcome the force of attraction between them. Dry ice (solid carbon dioxide, CO2) is an example of a solid that undergoes sublimation.

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:

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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Answer:

it is a chemical process

Explanation:

rusting is the formation of reddish-brown ferric oxides on iron by low-temperature oxidation in the presence of water.

The chemical formula for rust is Fe2O3 and is commonly known as ferric oxide or iron oxide. The final product is a series of chemical reactions simplified below as- The rusting of the iron formula is simply 4Fe + 3O2 + 6H2O → 4Fe(OH)3. The rusting process requires both the elements of oxygen and water.

Answer:

12 grams

Explanation:

2Mg + O₂ → 2MgO

This means that 2 moles of Magnesium reacts with 1 mole of Oxygen gas to form 2 moles of Magnesium Oxide (refer to Gay Lussac's law i.e when gases react they do so in volumes that bear a simple ratio to one another and to the products formed (in gaseous state) provided that temperature and pressure are kept constant)

Thus, 12g of Mg = 12g of MgO because the mole ratio of Mg to MgO is 2:2

% 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%