Follow these steps to write the balanced chemical equation for the reaction between nitric acid and iron (III)hydroxide.1. Start by writing the proper names of the products below (separated by a + sign).Nitric acid +Iron (III) hydroxide I2. Next, write the full, balanced molecular equation with the correct chemical formulas, includingcoefficients.3. Finally, write the net ionic equation for this reaction below, including ionic charges.

The question requires us to calculate the amount of moles of water that we would have in 5.3x10^26 molecules of water.

To solve this problem, we'll need to consider the Avogadro Number: this number states the amount of particles (electrons, ions, atoms, molecules etc.) in one mole of a substance. The Avogadro Number corresponds to 6.022 x 10^23 particles per mol.

Considering the Avogadro number and the number of molecules provided by the question, we can write:

6.022 x 10^23 molecules of water -------------------- 1 mol of water

5.3 x 10^26 molecules of water ------------------------ x

Solving for x, we'll have:

Therefore, there are 8.8 x 10^2 moles of water in 5.3 x 10^26 molecules of water.

Answer:

0.999

Explanation: divide by 10

Answer: The answer for 28 A is [tex][He]2s^2 2p^2[/tex]

28 B is [tex]1s^2 2s^2 2p^1[/tex]

Na+ (g) --> Na+ (aq) AH = -364 kJmol 1 is endothermic reaction. The given reaction is False, As H is negative hence exothermic reaction not endothermic

What is endothermic  reaction?

Chemical processes referred to as endothermic reactions occur when the reactants take in heat energy from their environment to create products. These reactions produce a cooling effect by bringing the temperature of the space around them down. Ice cubes absorb heat energy from their surroundings and melt to generate liquid water as an example of an endothermic physical process (no chemical bonds are broken or formed).

False, As H is negative hence exothermic reaction not endothermic

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Molarity or molar concentration is a measure of the concentration of a chemical species, of a solute in a solution, using as units, number of moles, and volume in liters. The formula for Molarity is:

M = n/V

Where:

n = number of moles

V = volume in Liters, 1 Liter

But we need to find the number of moles, we will do so by using its molar mass, KI = 166g/mol and the given mass in the question, 500g grams

166g = 1 mol

500g = x moles

x = 3.012 moles

Now we can use the Molarity formula

M = 3.012/1

M = 3.012 M, this is the molar concentration of the solution, 2

The question requires us to explain how a conversion factor must be used in a dimensional analysis expression.

We can say that a conversion factor is a fraction that we use to convert one unit of measure to another (as long as they measure the same quantity), and it conveys the relationship between these units of measure.

When using a conversion factor in a dimensional analysis process, we need to consider it as a "constant" that multiplies the expression of the dimensional analysis (and always with units that refer to the same measurement). We can't use it as a number in an addition or subctration, for example, or use a conversion factor of volume with an unit of distance.

1) Write the chemical equation.

2) List the elements in the reactants and in the products.

Reactants.

P: 4

O: 2

Products

P: 4

O: 10

Balance O.

3) Moles of O2 needed.

The molar ratio between P4 and O2 is 1 mol P4: 5 mol O2.

If 3.8 mol P4 are used, 19 mol O2 are needed.

.

Explanation:

Aluminum will react with chlorine gas according to the following reaction:

2 Al (s) + 3 Cl₂ (g) ----> 2 AlCl₃

We have to find the mass of Cl₂ that will completely react with 13.5 g of Al. First we have to convert the mass of Al to moles using its molar mass.

molar mass of Al = 26.98 g/mol

moles of Al = 13.5 g * 1 mol/(26.98 g)

moles of Al = 0.500 mol

2 Al (s) + 3 Cl₂ (g) ----> 2 AlCl₃

Now, according to the coefficients of the reaction, 2 moles of Al will react with 3 moles of Cl₂. So the molar ratio between them is 2 to 3. We can use that relationship to find the number of Cl₂ that will react with 0.500 mol of Al.

2 mol of Al : 3 moles of Cl₂ molar ratio

moles of Cl₂ = 0.500 mol of Al * 3 moles of Cl₂/(2 moles of Al)

moles of Cl₂ = 0.750 mol

And finally we can convert back to grams using the molar mass of Cl₂.

molar mass of Cl₂ = 70.91 g/mol

mass of Cl₂ = 0.750 moles * 70.91 g/(1 mol)

mass of Cl₂ = 53.2 g

Answer: a. 53.2 g of Cl₂ for complete reaction.

We are going to assume that the gas behaves like an ideal gas, so we can apply the following equation:

Where,

P is the pressure of the gas in atm

V is the volume of the gas in liters, 2600mL=2.6L

n is the number of moles

R is a constant, 0.08206atm.L/mol.K

T is the temperature in Kelvin, 33.0°C=306.15K

Now we need to find the moles of O2 to plug into the equation. We divide the grams by the molar mass of O2. The molar mass of O2 is 31.9988g/mol.

We substitute the values in the ideal gas equation:

Now, we convert the atm to mmHg:

Answer: The pressure of the gas is 1033mmHg

• The bond that exist between the CCl4 compound ,forms a covalent bond ,, this can be illustrated in the diagram below:

• We can see that it contains four non-polar covalent bond between carbon and chloride

The pOH of this solution is 6.2 as pH is 7.80, The hydronium ion concentration is   1.58*10^-8 M, The hydroxide ion concentration is  6.3*10^-7 M

What is pH?
pH is a numerical indicator of how acidic or basic aqueous or other liquid solutions are. The phrase, which is frequently used in chemistry, biology, and agronomy, converts the hydrogen ion concentration, which typically ranges between 1 and 1014 gram-equivalents per litre, into numbers between 0 and 14. The hydrogen ion concentration in pure water, which has a pH of 7, is 107 gram-equivalents per litre, making it neutral (neither acidic nor alkaline). A solution with a pH below 7 is referred to as acidic, and one with a pH over 7 is referred to as basic, or alkaline.

pKw = pH + pOH
14 = 7.80+ pOH
pOH = 14 -7.80 = 6.2

pH = - log [H+]
[H+] = 1.58*10^-8 M

pOH = - log [OH-]
[OH-] = 6.3*10^-7 M

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To count atoms, we can find the total sum of the subscripts in a chemical compound.

This is the case for most compounds. In some cases, we will have to multiply subscripts when there are elements inside brackets.

We're given:

Li₂SO₂

In front of lithium (Li), there is a 2.

In front of sulfur (S), there is nothing, which means 1.

In front of oxygen (O), there is a 2.

Add:

2 + 1 + 2 = 5

Therefore, there are 5 atoms in Li₂SO₂.

5 atoms

The nitrogen in ammonium nitrate contains a greater percentage of nitrogen by mass

The formula for ammonium nitrate is given as NH4NO3.

Determine the molar mass of NH4NO3

Molar mass = 14 + 4(1) + 14 + 3(16)

Molar mass .= 14 + 4 + 14 + 48

Molar mass of NH4NO3 = 80g/mol

Determine the percentage of nitrogen in the compound

%N = 28/80 * 100

%N = 35%

The formula for ammonium phosphate is (NH4)3PO4

Determine the molar mass of (NH4)3PO4

Molar mass = 3(14) + 4(3) + 4(16) + 3(31)

Molar mass = 42 + 12 + 64 + 31

Molar 1ass = 149g/mol

Determine the percentage of nitrogen in ammonium phosphate:

%N = 42/149 * 100

%N = 28.18%

Hence the nitrogen in ammonium nitrate contains a greater percentage of nitrogen by mass

Explanation:

Answer:

the water becomes solvent, and the mixture becomes the solution.

Explanation:

Answer:

a solution

Explanation:

solute and solvent(water) put together would produce a solution

Answer: the best option to answer the question is the second one (or letter B), "2"

Explanation:

The question requires us to identify how many electrons a calcium (Ca) atom would lose to form an ion.

We can analyze the electron configuration of Ca to understand how many electrons it would lose.

The atomic number of Ca is 20, thus its electron configuration is as it follows:

From the electron configuration, we can see that Ca presents 2 electrons in its valence shell (4s2). To achieve stability, it is easier for Ca to lose these two electrons and form a Ca2+ ion.

Therefore, the best option to answer the question is the second one (or letter B), "2".

The body of avocado fruit can be compared with the cell structure. The skin of the avocado is relatable with the cell membrane. Thus option B is correct.

Cell is the basic unit of life. Cells connect together to forms  tissues and tissues forms organs and a group organs forms an organ system. These different organ systems buildup the whole body.

Cell contains the core called nucleus. Inside the nucleus genetic material DNA, ribosomes, Golgi apparatus, lysosomes etc are located. The function of cell membrane is to protect the cell from damages as the skin do for our body.

In plants unlike animals, their cell is protected by a cell wall apart from cell membrane and various other differences are there in the cell structure of plant cells.

The fluid filled portion of cell is called cytoplasm. The inner content of the avocado fruit is comparable with the cytoplasm and its seed can be considered as the model for nucleus.

Therefore, the avocado's skin represents the cell membrane. Hence, option B is correct.

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The molar mass of oxygen gas (O2) is 32.00 g/mol.

The molar mass of C3H8 is 44.1 g/mol.

This kind of reaction is a combustion:

C3H8 + 5O2 → 3CO2 + 4H2O (In a combustion we obtain CO2 and H2O. Don't forget to balance this equation)

Procedure:

Let's use stoichiometry to solve this

44.1 g C3H8 --------- 5 x 32.00 g O2

0.025 g C3H8 --------- X

X = 0.091 g O2

Answer: mass of O2 required = 0.091 g

mL and cm³ have a 1 to 1 conversion, so we have:

But we don't have this option, so we will need to find another.

The other are in m³, so we can use the conversion from cm to m to get this:

So, we can apply this to what we have:

We have an option with 0.054m³, so the correc alternative is 0.054 m³.

Step 1

The reaction must be completed and balanced:

4NH3 (g) + 9O2 (g) => 4NO3 + 6H2O (g)

Reactants: NH3 and O2

Products: NO3 and H2O

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

Step 2

Information provided:

STP conditions, therefore:

1 mole of gas (NH3 in this case) = 22.4 L (volume)

5.3 g of O2

Liters => L

Grams => g

---------

Information needed:

The molar mass of O2 = 32.0 g/mol

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

Step 3

By stoichiometry,

1 mole NH3 = 22.4 L NH3

1 mole O2 = 32.0 g O2

Procedure: We will work with volume and mass

4NH3 (g) + 9O2 (g) => 4NO3 + 6H2O (g)

4 x 22.4 L NH3 ---------- 9 x 32.0 g O2

X ----------- 5.3 g O2

X = 5.3 g O2 x 4 x 22.4 L NH3/9 x 32.0 g O2 = 1.65 L approx.

Answer: 1.65 L of NH3

In order to find the percent composition for Nitrogen in NH4NO3, we will need to work with all the masses from this compound, so let's list them below:

NH4NO3 = 80.04 g/mol

N = 14 grams, but we have 2 nitrogens, therefore = 28 grams

H = 1 gram, 4 Hydrogens = 4 grams

O = 16 grams, 3 Oxygens = 48 grams

Now we take the total mass of the compound as 100% and check how much it will be made by Nitrogen:

80.04 g = 100%

28 g = x %

x = 34.98%, which we can round up to 35% therefore the answer will be letter E

When copper carbonate disolves the following happens:

The formula for the solubility product constant is:

As for every copper ion in solution there is one carbonate ion, we know that the concentration of both ions in solution is 0.57mol/l.

Now we calculate the constant:

So the answer is Ksp= 0.3249 mol2/L2

In order to solve this question we need to set up the properly balanced equation first:

CaCO3 + 2 HCl -> CaCl2 + H2O + CO2

Now that our reaction is properly balanced, we have to find the limiting reactant in order to find how much mass of CaCl2 will be produced

We have:

10.0 g of CaCO3, molar mass = 100.086 g/mol

15.0 g of HCl, molar mass = 36.46 g/mol

Now we need to find the number of moles of the reactants, and see if the amount available of the other reactant is the one needed to react.

CaCO3:

100.086g = 1 mol

10g = x moles

x = 0.099 moles of CaCO3

According to the molar ratio, the CaCO3 and HCl will have a relationship in which we will always need 2 times more HCl than CaCO3, therefore if we have 0.099 moles of CaCO3, we will need 0.198 moles of HCl in order to proceed with the reaction, but we don't know if that is the right amount, let's check:

HCl:

36.46g = 1 mol

15.0g = x moles

x = 0.411 moles of HCl, this means that we have an excess of HCl, since we only need 0.198 moles in order to react with CaCO3. Therefore Calcium carbonate is the limiting reactant.

Now that we know which one is the limiting reactant, we can find the mass produced of CaCl2.

Again the molar ratio is important here, but know, we will always have the same number of moles for CaCO3 and CaCl2, 1:1 will be the molar ratio, therefore if we have 0.099 moles of CaCO3, we will also have 0.099 moles of CaCl2, using its molar mass, 110.978g/mol, we can find the final mass

CaCl2:

110.978g = 1 mol

x grams = 0.099 moles

x = 11.0 grams (it is actually 10.986 grams, but I have rounded up to 11 grams)

Answer

T = 226.21 K

Explanation

Given:

Pressure = 123 kPa

Volume = 10.0 L

number of moles = 0.654 moles

We know R = 8.314 L kPa/mol k.

Required: Temperature

Solution:

Pv = nRT

T = PV/nR

T = (123 kPa x 10.0 L)/(0.654 mol x 8.314 L kPa/mol k)

T = 226.21 K

The pH of a 0.670 M solution of Ca(NO₂)₂ is 1.76

When HNO₂ dissociates, it forms H⁺ and NO₂⁻ ions.

HNO₂ ==> H⁺ + NO₂⁻

Ka of HNO₂ = [H⁺] [NO₂⁻] / [HNO₂] = 4.5× 10⁻⁴

Let’s take x for unknown

4.5 x 10⁻⁴ = (x)(x) / 0.670

4.5 x 10⁻⁴ = x² / 0.670

x² = 3.015 x 10⁻⁴

x = 1.74 x 10⁻²

[H⁺] = 1.74 x 10⁻² M

pH is the measurement of the acidity or basicity of a compound. It ranges from  0 to 14

Therefore, the pH of a 0.670 M solution of Ca(NO₂)₂ is

pH = -log [H⁺]

pH = -log 1.74 x 10⁻²

pH = 1.76

The pH of a 0.670 M solution of Ca(NO₂)₂ is 1.76 which lies in the acidic range (0 to 7)

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Given the hypothetical thermochemical equation, expressed as:

We are to find the enthalpy change (ΔH ) for the reaction 2C → 3 A + B.

• You can see that the, given reaction, 2C → 3 A + B is the, reverse ,of the thermochemical equation 3 A + B → 2 C.

• Since the ,reverse reaction is possible,, the reaction enthalpy has the ,same numerical value, but with the, ,opposite sign

Therefore, the enthalpy change ∆H, in kJ/mol, be for the reaction 2 C → 3 A + B is -65.5kJ/mol

Answer:

right

Explanation:

The balanced equation

2H2 +O2 =====> 2H2O

What is balanced equation ?

An equation for a chemical reaction is said to be balanced if both the reactants and the products have the same number of atoms and total charge for each component of the reaction. In other words, both sides of the reaction have an equal balance of mass and charge.

The balanced equation

2H2 +O2 =====> 2H2O

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The forensic scientist best categorize this blood stain by impact. Thus option B is correct.

Forensic science is defined as the application of science to criminal and civil laws, with a focus on the criminal side during a criminal investigation as defined by the legal requirements of admissible evidence and criminal procedure.

There are various laws and principles of forensic science.

Thus, the forensic scientist best categorize this blood stain by impact. Thus option B is correct.

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