HELPPPPP ASAP PLEASEEE

Answer:

A

Explanation:

nitrogen has the similar properties because carbon is the opposite of oxygen

Explanation:

Given -

molar mass = 135.13 g/mol

To Find -

Solution:

we know that -

So,

Here empirical mass =

12.01 + 1.008 + 14.01 = 27.028

Then,

135.13 = n × 27.028

n = 4.99 ≈ 5

We know that,

Then,

molecular formula = 5(CHN)

= C₅H₅N₅

Therefore,

Option A is correct✔

Answer:

b. False

Explanation:

The formula to find the concentration of a solution is we simply divide the number of moles of the solute with total solution volume in liters. This gives the molar concentration of a solution. Clearly we do not use the number of moles of the entire compound but only that of solute.

Hence, we can conclude that the given statement is false.

Answer:

answer is c or fuel

Explanation:

There are 0.84 moles of aluminum ions (Al3+) present in 0.42 mol of Al2(SO4)3.

To determine the number of moles of aluminum ions (Al3+) present in 0.42 mol of Al2(SO4)3, we need to consider the stoichiometry of the compound.

The formula of aluminum sulfate (Al2(SO4)3) indicates that for every 1 mole of the compound, there are 2 moles of aluminum ions (Al3+). This means that the mole ratio of Al3+ to Al2(SO4)3 is 2:1.

Given that we have 0.42 mol of Al2(SO4)3, we can calculate the moles of Al3+ as follows:

Moles of Al3+ = 0.42 mol Al2(SO4)3 x (2 mol Al3+ / 1 mol Al2(SO4)3)

Moles of Al3+ = 0.42 mol Al2(SO4)3 x 2

Moles of Al3+ = 0.84 mol Al3+

Therefore, there are 0.84 moles of aluminum ions (Al3+) present in 0.42 mol of Al2(SO4)3.

It's important to note that the stoichiometry of the compound determines the mole ratio between the different species involved in the chemical formula. In this case, the 2:1 ratio of Al3+ to Al2(SO4)3 allows us to determine the number of moles of Al3+ based on the given amount of Al2(SO4)3.

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Answer:

A prokaryotic cell is shown in the image

Explanation:

Prokaryotic cells are the most basic types. Since they are basic, they don't have a nucleus. All eukaryotic cells have it but prokaryotic cells don't have it. A nucleus contains organelles such as a mitochondria which the diagram doesn't show as well. Thus a prokaryotic cell is shown in the image.

Answer

Nine (9) atoms of oxygen are in three molecules of NaHCO₃.

Explanation

Given that:

The chemical formula for the compound is NaHCO₃

What to find:

The number of atoms of oxygen in three molecules of NaHCO₃.

Solution:

Concept: The chemical formula of a compound shows the number of each atom present in its molecule.

As per the given chemical formula, there are 1 sodium atom, 1 hydrogen atom, 1 carbon atom, and 3 oxygen atoms present in one molecule of NaHCO₃.

The number of atoms of oxygen in three molecules of NaHCO₃ will be (3 x 3) = 9 atoms of oxygen.

Therefore, nine (9) atoms of oxygen are in three molecules of NaHCO₃.

Answer: Scientists make designs based on engineering knowledge and

then make it available for public use.

Answer:

0.0104 moles of gas in the flask.

Explanation:

To calculate the number of moles of gas in the flask, you can use the ideal gas law equation: PV = nRT. Where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant and T is temperature.

First, you need to convert the pressure from mmHg to atm and the temperature from Celsius to Kelvin. The pressure in atm is 760.0 mmHg / 760 mmHg/atm = 1 atm. The temperature in Kelvin is 17.00°C + 273.15 = 290.15 K.

Next, you need to convert the volume from mL to L. The volume in L is 250.0 mL / 1000 mL/L = 0.2500 L.

Now you can plug all the values into the ideal gas law equation and solve for n: (1 atm)(0.2500 L) = n(0.08206 L·atm/mol·K)(290.15 K). Solving for n gives n = 0.0104 mol.

So there are approximately 0.0104 moles of gas in the flask.

Answer:

A 20.0 L

20.0

L

nickel container was charged with 0.500 atm

0.500

a

t

m

of xenon gas and 1.50 atm

1.50

a

t

m

of fluorine gas at 400 ∘C

400

∘

C

. The xenon and fluorine react to form xenon tetrafluoride. What mass of xenon tetrafluoride can be produced assuming 100%

100

%

yield?

Explanation:

The molar concentration of Fe(NO3)3 in the stock solution is 0.0634 M, written in scientific notation as 6.34 x 10-2 M.

To calculate the molar concentration of Fe(NO3)3 in the stock solution , you must first calculate the total moles of Fe(NO3)3 present. This can be done by multiplying the volume of Fe(NO3)3 by its concentration. Therefore, the total moles of Fe(NO3)3 present is 10.0 ml x 0.200 M = 2.00 moles.

Next, the total volume of the stock solution must be found. This can be done by adding the volumes of all components, which in this case is 3.0 ml + 10.0 ml + 17.0 ml = 30.0 ml. Finally, the molar concentration of Fe(NO3)3 can be found by dividing the total moles of Fe(NO3)3 by the total volume of the stock solution: 2.00 moles / 30.0 ml = 0.0634 M.

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One mole of iron is equal to one mole of oxygen. As a result, FeO is the empirical formula for the metal oxide.

Rust has the chemical formula Fe2O3, also known as ferric oxide or iron oxide. The result is a chain of chemical processes that can be summed up as follows: The formula for rusting iron is 4Fe + 3O2 + 6H2O 4Fe (OH) 3. Water and oxygen are both necessary for the rusting process.

By deducting the mass of the iron from the overall mass of the metal oxide, we can determine the mass of oxygen that combined with the iron:

mass of oxygen = mass of metal oxide - mass of iron

mass of oxygen = 21.16 g - 16.45 g

mass of oxygen = 4.71 g

Then, using their respective molar masses, we can convert the masses of iron and oxygen to moles:

moles of iron = 16.45 g / 55.85 g/mol = 0.294 mol

moles of oxygen = 4.71 g / 16.00 g/mol = 0.294 mol

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Answer:Mass of Potassium chloride =1.762g

Explanation:

Mass of empty beaker = 23.100 g

Mass of beaker with Potassium chloride = 24.862g

Mass of Potassium chloride = Final weight - initial weight = Mass of beaker with Potassium chloride  - Mass of empty beaker = 24.862-23.100 = 1.762g

Answer:

32.0 kJ

General Formulas and Concepts:

Thermochemistry

Specific Heat Formula: q = mcΔT

Explanation:

Step 1: Define

Identify variables

[Given] m = 1.00 g

[Given] ΔT = 1.48 °C

[Given] c = 21.6 kJ/g °C

[Solve] q

Step 2: Find Heat

Step 3: Check

Follow sig fig rules and round. We are given 3 sig figs.

31.968 kJ ≈ 32.0 kJ

Answer:

no of moles=mass in gm÷molar mass so let x be the mass in gm

4.5=x÷35.5×2

x=4.5×35.5×2 grams

x=319.5 gm

Explanation:

formula

Answer:

Explanation:

C = 49.48

H = 5.19

O = 16.48

N = 28.85

ratio of moles

= 49.48 / 12 : 5.19 / 1 : 16.48 / 16 : 28.85 / 14

= 4.123 : 5.19 : 1.03 : 2.06

= 4 : 5 : 1 : 2

so the empirical formula = C₄ H₅O N₂

Let molecular formula = (  C₄ H₅ON₂ )ₙ ,

n ( 48 + 5 + 16 + 28 ) = 119.19

97 n = 194.19

n = 2 ( approx )

molecular formula = C₈ H₁₀O₂ N₄

Answer: Because heat rises and it also makes the water bubble up which creates more height.

Explanation:

Answer Liquid on the bottom of the pot closest to the heat source starts to get hot; as that happens, it rises. The rising hot water is replaced by the cooler, more dense water molecules.

Explanation:

Answer:

Explanation:

∆H positive means heat is required or absorbed -- endothermic

∆H negative means heat is produced or removed -- exothermic

The pH of a 5.8M solution of hypobromous acid is 4.9.

Dissociation of hypobromous acid (HBrO)

HBrO ⇌ H⁺ + BrO⁻

Acid dissociation constant (K) of HBrO is given as 2.3×10⁻⁹

K = [H⁺][BrO⁻]/[HBrO]

Solution of hypobromous acid 5.8M

H⁺ and BrO⁻ are produced when x moles of HBrO dissociate into x moles of H+.

Equilibrium concentration of HBrO = (5.8 - x) M

K = [H⁺][BrO⁻]/[HBrO] = x²/(5.8 - x)

x = (-b ± √(b²-4ac)/2a)

a = 1, b = 0, and c = -K(5.8)

x = (-0 ± √(0² - 4(1)(-2.3 × 10⁻⁹)(5.8))/2(1)

x = 1.227×10⁻⁵

The equilibrium concentration of H+ and BrO- is 1.227×10⁻⁵ M, and the equilibrium concentration of HBrO is 5.8 M

Therefore, pH of the solution

pH = -log[H⁺]pH = -log(1.227ₓ10⁻⁵) = 4.9

The pH of a 5.8M solution of hypobromous acid is 4.9.

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The mass of the asteroid is C. 1.2 x \(10^{12}\) Kg

To find the mass of the other asteroid, we can rearrange the equation for the gravitational force between two objects:

F = (G * m1 * m2) / \(r^{2}\)

where F is the force of gravity, G is the gravitational constant, m1 and m2 are the masses of the two asteroids, and r is the distance between them.

Given that the distance between the asteroids is 75000 m, the force of gravity between them is 1.14 N, and one asteroid has a mass of 8 x \(10^{7}\) kg, we can substitute these values into the equation and solve for the mass of the other asteroid (m2):

1.14 N = (6.67430 × \(10^{-11}\) N \(m^{2}\)/\(Kg^{2}\) * 8 x \(10^{7}\) kg * \(m2\)) / \((75000 m)^{2}\)

Simplifying and solving the equation, we find that the mass of the other asteroid (m2) is approximately 1.2 x \(10^{12}\) kg. Therefore, Option C is correct.

The question was incomplete. find the full content below:

Two asteroids are 75000 m apart one has a mass of 8 x \(10^{7}\) kg if the force of gravity between them is 1.14 what is the mass of the asteroid

A. 3.4 x \(10^{11}\) kg

B. 8.3 x \(10^{12}\) kg

C. 1.2 x \(10^{12}\) kg

D. 1.2 x \(10^{10}\) kg

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Answer: There are 0.375 moles of neon gas present in the testing chamber.

Explanation:

The question requires us to calculate the number of moles of neon gas, given that the gas is in a 2.50 L chamber at 325.0 K and the pressure inside the chamber is 4.00 atm.

We can solve this problem using the equation for ideal gases, as shown below:

where P is the pressure of the gas (P = 4.00 atm), V is the volume of the gas (V = 2.50 L), n is the number of moles, that we want to calculate, T is the temperature of the gas (T = 325.0 K) and R is the gas constant.

Note that the values of pressure and volume are given in atm and L, respectively. Therefore, we can apply the gas constant in units of L.atm/mol.K:

R = 0.082057 L.atm/K.mol

First, let's rearrange the equation of ideal gases in order to calculate the number of moles of gas:

Now, applying the values given by the question and the constant R, we'll have:

Therefore, there are 0.375 moles of neon gas in the testing chamber under the conditions given by the question.

The final temperature of the mixture given that 25 g of water at 25 °C is mixed with 25 g of water at 65 °C, is 45 °C

The final temperature of the mixture can be obtained by calculating the equilibrium temperature of the mixture. This is shown below:

Heat loss by warm water = Heat gain by cold water

MᵥᵥC(Tᵥᵥ - Tₑ) = MC(Tₑ - T)

Cancel out C

Mᵥᵥ(Tᵥᵥ - Tₑ) = M(Tₑ - T)

25× (65 - Tₑ) = 25 × (Tₑ - 25)

Cancel out 25

65 - Tₑ = Tₑ - 25

Collect like terms

65 + 25 = Tₑ + Tₑ

90 = 2Tₑ

Divide both side by 2

Tₑ = 90 / 2

Tₑ = 45 °C

Thus, we can conclude that the final temperature the mixture is 45 °C

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5ml of dextrose and 500 mg of levolloxacin would be delivered to a patient upon the administration of a 100-mL injection.

An antibiotic called levofloxacin is used to treat bacterial infections. In humans, germs are the main cause of many common illnesses. Many regions of the body can become infected by bacteria as they develop and reproduce. Antibiotics are medications that tame and eliminate these germs.

Levofloxacin is indeed an antibiotic that prevents bacteria from multiplying by stopping their DNA from being replicated and repaired.

first component dose is 5 mg / ml

Then for 100 ml, it takes 500 mg

Similarly, the volume by mass percent of the dextrose dose is 5% that is 5 ml in 100 ml, So 5ml of dextrose and 500 mg of levolloxacin.

Therefore, 5ml of dextrose and 500 mg of levolloxacin would be delivered to a patient upon the administration of a 100-mL injection.

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Answer:Charles Darwin was a British naturalist who proposed the theory of biological evolution by natural selection. Darwin defined evolution as "descent with modification," the idea that species change over time, give rise to new species, and share a common ancestor.

Explanation:

The volume of gas when the pressure is 45 psi is 2,833.33mL.

The volume of a substance can be calculated using Boyle's law equation as follows:

P₁V₁ = P₂V₂

Where;

According to this question, a tank of carbondioxide has a pressure of 850 psi and a volume of 150 mL. The volume can be calculated as follows:

850 × 150 = 45 × V

V = 127,500 ÷ 45

V = 2,833.33mL

Therefore, 2,833.33mL is the volume of the gas.

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Answer::

Explanation::

Answer:

May be its correct bro

Explanation:

take it easy

The enthalpy or heat content of a system can be defined as the sum of the internal energy and the pressure volume energy of the system. It is denoted by H. The energy change of mixture is  47 kJ.

The transference of energy may take place in the form of work if the system and surroundings have different pressures. According to international conventions, work done on the system is positive and work done by the system is negative.

The enthalpy change is:

ΔH = ΔU + PΔV

190 = ΔU + 143

ΔU = 47 kJ

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