Balance the equation: __MgCl2 + __Cr2O3 --> __MgO + __CrCl3

Answer:

Explanation: 2 C19H34O2(l) + 53 O2(g) ==> 38 CO2(g) + 34 H2O(l) ... balanced equation

∆Hcombustion

∆H = ∑∆Hf products - ∑∆Hf reactants

∆H = [(38 x -393.5) + (34 x -285.8)] - (2 x -645.7) = (-14,953 + -9717) - (-1291)

∆H = -24,670 + 1291

∆H = 25,961 kJ

(be sure to check the math)

A. The balanced equation for the reaction is given as

C₃H₈ + 5O₂ -> 3CO₂ + 4H₂O

B. The mass (in grams) of carbon dioxide that can be produced by burning 20.0 pounds of propane is 27216.49 g

A. Balance equation

The balanced equation for the combustion of propane is:

C₃H₈ + 5O₂ -> 3CO₂ + 4H₂O

B. How to determin the mass (in grams) of CO₂ produced

The mass (in grams) of CO₂ produced from the reaction can be obtained as follow:

From the balanced equation above,

0.097 pound of C₃H₈ reacted to produce 132 g of CO₂

Therefore,

20 pound of C₃H₈ will react to produce = (20 × 132) / 0.097 = 27216.49 g of CO₂

Thus, the mass of CO₂ produced is 27216.49 g

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The amount of heat energy that must be inputted into the reaction to make 58.9 grams of C₆H₁₂O₆ is 968.574 KJ

We'll begin by obtainig the number of mole of 58.9 grams of C₆H₁₂O₆. This can bbe obtained as follow:

Mole = mass/ molar mass

Mole of C₆H₁₂O₆ = 58.9 / 180

Mole of C₆H₁₂O₆ = 0.327 mole

Finally, we shall determine thhe heat energy needed.

The balanced equation for the reaction is given below:

6CO₂(g) + 6H₂O(g) → C₆H₁₂O₆(g) + 6O₂(g) ΔH = +2962 KJ/mol

From the balanced equation for above,

1 moles of C₆H₁₂O₆ was produced by 2962 KJ of heat energy.

Therefore,

0.327 mole of C₆H₁₂O₆ will be produce by = (0.327 × 2962) / 1 mole = 968.574 KJ of heat energy

Thus, 968.574 KJ of heat energy is needed for the reaction

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The initial temperature of the argon is 2678 K

Given that,

Initial volume (V1) = 4.95 L

Initial pressure (P1) = 0.92 atm

Final temperature (T2) = 30 C = 303.15 K

Final volume (V2) = 5.7 L

Final pressure (P2) = 0.092 atm

We need to find the Initial temperature of the argon represented as T1

We Know that, In ideal gas law: PV = nRT

It can be written as, P1V1 / T1 = P2V2 / T2

(0.92 * 4.95) / T1 = (0.092 * 5.7) / 303.15

4.554 / T1 = 0.5244 / 303.15

4.554 / T1 = 0.0017

T1 = 4.554 / 0.0017

T1 = 2678 K

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The relationship between the number nodes,  the energy level n and the azimuthal quantum number l is (n-l -1) + l. Thus the total number of nodes is n-1.

Node is the region or point in the orbital where the probability of finding an electron is zero. Electrons are revolving around circular paths of fixed energy levels.

The principal quantum number n represents the number of main shells or the energy level of the electrons. Whereas, azimuthal quantum number represents the number of orbitals denoted as l.

The point where there is a probability of finding an electron is called antinode. The total node in an orbital is the sum of number of planar nodes and number of spherical nodes.

Thus total number of nodes =  (n-l-1) + l

                                               = n - 1.

Therefore, the total number of nodes is n-1. For example for n=3 level there will be two nodes.

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Answer:

Linear (180 degrees)

Explanation:

Whenever you have a triple bond between two atoms, their shape is linear. This is because the density of the triple bond between them is heavy, causing the other things attached to the atom to be as far away as possible, creating a linear structure.

Answer

acids and bases are both corrosive furthermore both will conduct electricity depending on the strength of the acid or base

C is the correct option

Ethylmethylamine is a secondary amine, that has one ethyl group attached to the amine group and one methyl group, which is a also attached to the amine group.

It is represented by:

Nevertheless it can be represented by CH3CH2NHCH3.

It means that the correct answer is c. Both.

This element is nonmetal and appears in the periodic table.

The number that represents the position of the elements is called, the atomic number, it also represents the number of protons = numbers of electrons an atom has.

Answer: D. the atomic number

In this question, we have a reaction between silver nitrate and potassium chloride, which will have the following chemical formula and also the following product:

AgNO3 (aq) + KCl (aq) --> AgCl (s) + KNO3 (aq)

Now we need to identify the ions that are components of the precipitate that was formed in this reaction

A precipitate is a product of a reaction that is not soluble in water in the conditions given in the reaction, therefore the precipitate will be a solid product of the reaction. The solid of the reaction is AgCl, therefore this is the precipitate

Now the ions that compose AgCl are Ag+ and Cl-, the answer will be the 3rd option

According to the stoichiometry, 4.85 g of propane is required to produce 14.7 g carbon dioxide.

It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.

In the given problem as per balanced equation of combustion of propane 2 molecules of propane produce  8 molecules of carbon dioxide.That is, 116.24 g of propane produces 352.08 g of carbon dioxide.

∴14.7 g of carbon dioxide is produced by, 14.7×116.24/352.08=4.85 g of propane.

Thus, 4.85 g of propane is required to produce 14.7 g of carbon dioxide.

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The formula for calculating the amount of heat energy absorbed is given as:

Given the following

• mass m = 50.0g

• Heat energy Q = 7490 Joules

• change in temperature = 80 -10= 70 degrees celsius

Substitute

Hence the specific heat capacity of methanol is 2.14J/gC

ANSWER

Volume of the gas 5.3L

EXPLANATION;

Given that

The pressure of the chlorine gas is 688 torr

The temperature of the chlorine gas is 36 degrees Celcius

The mass of NaCl is 22 grams

Follow the steps below to find the volume of chlorine gas

Step 1; Write a balanced equation for the reaction

In the above reaction, 2 moles of Na react with 1 mole of chlorine to form 2 moles of NaCl

Step 2; Find the number of moles of NaCl using the below formula

Recall, that the molar mass of NaCl is 58.44 g/mol

Step 3; Find the number of moles of Cl2 using a stoichiometry ratio

Let x represents the number of moles of Cl2

The number of moles of Cl2 is 0.188 mol

Step 4; Find the volume of the gas using the ideal gas equation

Convert the temperature to degree kelvin

Step 5; Find the volume of the gas

Therefore, volume of the gas 5.3L

The reaction that occurs on the left is called a single displacemt reaction

Answer:

89.58 moles of MnO3 are produced.

Explanation:

1st) From the balanced reaction we know that the relation between O2 and MnO3 is that 3 moles of O2 produces 2 moles of MnO3.

2nd) To build the equation, we must build a path from the given value of 4.30kg of O2 to moles of MnO3. So, it is important to figure out the relations that we need to build the equation.

The order to build the equation is:

• Start with, the given value of ,4.30kg of O2,.

• We need to convert kg to grams, so we need the realtion between kg and g: ,1kg=1000g,.

• To convert the grams of oxygen to moles, we need to use the molar mass of O2: ,32g/1mol,.

• We need to use the relation between O2 and MnO3 from the balanced equation: ,3 moles of O2, produces, 2 moles of MnO3,.

So, 89.58 moles of MnO3 are produced.

The molecular formula for the compound that contains 4.90 g N and 11.2 g O is N₂O₄

We'll begin by obtaining the empirical formula for the compound. This is illustrated below:

Divide by their molar mass

N = 4.9 / 14 = 0.35

O = 11.2 / 16 = 0.7

Divide by the smallest

N = 0.35 / 0.35 = 1

O = 0.7 / 0.35 = 2

Thus, the empirical formula of the compound is NO₂

Finally, we shall determine the molecula formula. Details below

Molecular formula = empirical × n = molar mass

[NO₂]ₙ = 92

[14 + (16×2)]ₙ = 92

46n = 92

Divide both side by 46

n = 92 / 46

n = 2

Molecular formula = [NO₂]ₙ

Molecular formula = [NO₂]₂

Molecular formula = N₂O₄

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Complete question:

Find the molecular formula for a compound that contains 4.90 g N and 11.2 g O. The molar mass of the compound is 92.0 g/mol.

A student finds two green powders that look the same he wants to figure out if the two powders are the same or different substances then mix the two green powders together and then test the properties

A powder is a dry bulk solid composed of many very fine particles that may flow freely when shaken or tilted and to figure out unknown two mixture powder are same or different then student want to mix the two green powders together and then test the properties because of properties student the two unknown powder are to be determined

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Answer:

Al 3+

Na+

Mg2+

F-

Explanation:

The element with the given electron that isn't an ion is Neon. It has 10 electrons in total.

Looking at the periodic table attached will help to see how the elements below are related to the one circled in red (Ne).

Al 3+ lacks 3 (because it has a 3+ charge) of its normal electrons so it has 10 and will have the same electron configuration as shown.

Na+ lacks one electron so it will also have 10 electrons instead of its normal 11.

Mg 2+ lacks two electrons so it will also have 10 total electrons.

F- has gained an extra electron so it now has 10 instead of 9.

Al3+, Na+, F-, and Mg2+ will have the given electronic configuration.

The electronic configuration given in the question is:

2p6, 2s2, 1s2

If it was a stable atom, the answer would have been Neon.

And if that would have been negative ion or anion (to be precise),

the answer would have been either F- or O2-.

But in the case of positive ions or we can say cations,

Al3+, Na+, and Mg2+ have the given electronic configurations.

Because the atom of Aluminum loses three electrons to achieve another state which is responsible for the formation of Al3+.

Similarly,

The atoms of Sodium and Magnesium also lose one and two electrons respectively to form Na+ and Mg2+.

So, we can conclude that Al3+, Na+, F- and Mg2+ will have the given electronic configuration.

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The volume of 0.875 mol/dm³ NaOH solution needed to make up a 100.0 ml of a diluted solution with a concentration of 0.235 mol/dm³ NaOH is 73.15 mL.

Given that :

molarity M1 = 0.875 mol/ dm³

M2 = 0.235 mol/ dm³

volume V2 = 100mL

using the formula , we get

M1 V1 = M2 V2

substituting the values in the formula we get :

0.875 × V1 = 0.235 × 100 mL

V1 = 26.857 mL

the volume added = V2 - V1 = 100 mL - 26.85 = 73.15

Thus, The volume of 0.875 mol/dm³ NaOH solution needed to make up a 100.0 ml of a diluted solution with a concentration of 0.235 mol/dm³ NaOH is 73.15 mL.

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The answer is -2219.9 kJ/mol

Answer:

Biological evidence, since it was a hair, which forms part of the human

Answer:

d. Nickel

Explanation:

The atomic radius is a periodic property, that is, we can see how it varies in the Periodic Table of Elements.

Atomic radius increases by a column (group) from top to bottom, and increases by a row (period) from right to left.

We can see the variation of atomic radius and the location of the given atoms in the following drawing:

Since K (potassium), Ca (calcium), Co (cobalt) and Ni (nickel) are located in the same row (period), to identify which one has the smallest atomic radius, we have to analyze the increase in horizontal atomic radius.

So, the Ni atom has the smallest atomic radius (because it is located more to the right compared to the other atoms in the same row) and K atom has the largest atomic radius.

1) List the known and unknown quantities.

Sample: O2

Amount of substance: 0.650 mol O2.

Volume: 1.00 L.

Pressure: 20.00 atm.

Ideal gas constant: 0.082057 L * atm * K^(-1) * mol^(-1)

Temperature: unknown.

2) Set the equation.

Ideal gas law.

3) Plug in the known quantities and solve for T.

4) Convert K to ºC.

The temperature of the gas under these conditions is 101.81ºC.

.

Answer:

B. The percent yield is 55.9%.

Explanation:

From the balanced reaction we know that 2 moles of FePO4 produce 1 mole of Fe2(SO4)3.

1st) It necessary to convert moles into grams, using the molar mass of FePO4 (151g/mol) and the molar mass of Fe2(SO4)3 (400g/mol):

- FePO4 conversion:

- Fe2(SO4)3 conversion:

In this case, it is not necessary the conversion, because there is 1 mole, so it is equal to 400g.

Now we know that 302g of FePO4 produce 400g of Fe2(SO4)3.

2nd) Now we have to calculate the Theoretical yield of Iron (III) sulfate, that is, the amount of Iron (III) sulfate that we must produce from 25g of Iron (III) phosphate:

So, the Theoretical yield is 33.11g.

3rd) Finally, we can calculate the Percent yield using the Theoretical yield (33.11g) and the Actual yield (18.5g):

So, the percent yield is 55.9%.

The balanced chemical equation for 0.1 M barium nitrate and 0.1 M sodium sulfate is -

2 Ba(NO₃)₂ + 2 Na₂SO₄   →   2 Ba(SO₄) + 2 NaNO₃

Balanced chemical equation are the equations having equal amount of reactants and the products formed. The reactants are placed on the left and products are placed on right forming a balanced chemical equation.

When 0.1 M barium nitrate reacts with the 0.1 M sodium sulfate, it gives an insoluble salt of barium sulfate and soluble salt of sodium nitrate as the product. This reaction is a type of precipitation reaction as precipitate is formed in the reaction. It is a double displacement reaction because the sulfate ions replace the nitrate ions to give the product.

Barium sulfate is known to be the most insoluble compound. It is formed as a precipitate.

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Green column - Alkaline earth metals

Red column - Alkali metals

Purple column - Lanthanides and actinides

Blue column - Transition metals

The red block are made up of group 1 elements and these elements are known as Alkali metals.

The green column are the group 2 elements in the periodic table and are known as the Alkali earth metals.

For the blue columns, they are element from group 3 to 10 and they are known as the transition metals.

For the purple column, they are Lanthanides and actinides

Step 1 - "Reading" the equation

The given chemical equation is:

The bigger numbers, those that come before the formulas of the substances, indicate the quantity in moles of each substance required in this rection.

We can "read" this reaction thus as :

one mole of CH4 reacts with 2 moles of O2 thus producing one mole of CO2 and two moles of H2O

As the exercise is specifically asking about the proportion between O2 and CO2, we can further simplify this statement to:

two moles of O2 produce one mole of CO2

Step 2 - Obtaining the "recipe" for the reaction

In order to obtain a relation in grams, we need to multiply the number of moles of each substance by its respective molar mass. Let's remember that:

two moles of O2 produce one mole of CO2

Therefore, converting to grams (molar masses: 32 g/mol for O2; 44 g/mol for CO2)

We have now obtained the "recipe" for this reaction:

64g of O2 produce 44g of CO2

Pretty much as we would with a cake recipe, we can use this to predict how much CO2 is formed.

Since the reaction of two moles of O2 is exactly what we have already calculated, 44g of CO2 would be formed in this reaction.

ANSWER

The pressure of the gas is 281.25 mmHg

EXPLANATION

Given that;

The initial pressure of the gas is 75 mmHg

The intial temperature of the gas is 80K

The final temperature of the gas is 27 degrees Celcius

Follow the steps below to find the final pressure of the gas

Step 1; Convert the final temperature to degrees kelvin

Step 2; Apply the Gay Lussac's law

1) Subatomic particles. Atoms are made up of smaller parts called subatomic particles. Proton, neutron, and electron are some of them.

Electron: 9.11*10^-31 kg.

Proton: 1.672 18*10^-27 kg.

Neutron: 1.674 93*10^27 kg.

The lightest subatomic particle is the electron, then comes the protons, and finally the electron.