Using the information in the table to the right, calculate the enthalpy of combustion of 1 mole of acetylene for the reaction

Considering the definition of Avogadro's number:

Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.

You can apply the following rule of three, considering the Avogadro's number:  If 1 mole of lithium contains 6.023×10²³ molecules, 2.7 moles of lithium contains how many molecules?

amount of molecules of lithium= (6.023×10²³ molecules × 2.7 moles)÷1 mole

amount of molecules of lithium=1.62621×10²⁴ molecules

Finally, the number of molecules of lithium is 1.62621×10²⁴ molecules.

On the other hand you can apply the following rule of three, considering the Avogadro's number:  If 1 mole of sodium chloride​ contains 6.023×10²³ molecules, 1.8 moles of  sodium chloride​ contains how many molecules?

amount of molecules of sodium chloride= (6.023×10²³ molecules × 1.8 moles)÷1 mole

amount of molecules of sodium chloride=1.08414 ×10²⁴ molecules

Finally, the number of molecules of sodium chloride is 1.08414×10²⁴ molecules.

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Answer:

Chemical reaction A, because the reactant is a compound

Explanation:

In a decomposition reaction, a compound is broken down into its components, so the number of products is greater than the number of reactants

Chemical reaction A, because the reactant is a compound is a statements correctly identifies the decomposition reaction and describes a substance involved.

When atoms establish or break chemical bonds, chemical processes take place. Reactants are the substances that begin a chemical reaction, while products are the compounds that are created as a result of the reaction.

Although a chemical reaction is not always a "one-way street," as we'll examine further in the next section, an arrow is drawn between the reactants and products to denote the direction of the reaction.

 Our equation must have them in it in order for there to be an equal number of atoms of each element on both sides of the equation.

Therefore, Chemical reaction A, because the reactant is a compound is a statements correctly identifies the decomposition reaction and describes a substance involved.

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Answer:

4 NH₃ (g) + 3 O₂ (g) ----> 2 N₂ (g) + 6 H₂O (g) + energy

Explanation:

The unbalanced equation:

NH₃ (g) + O₂ (g) ----> N₂ (g) + H₂O (g) + energy

Reactants: 1 nitrogen, 3 hydrogen, 2 oxygen

Products: 2 nitrogen, 2 hydrogen, 1 oxygen

The sort-of balanced equation

2 NH₃ (g) + 1/2 O₂ (g) ----> N₂ (g) + 3 H₂O (g) + energy

I first started by balancing the nitrogens. This then lead me to balance the hydrogens. When I went to balance the oxygens, only a 1/2 coefficient would work. However, 1/2 coefficients are technically incorrect. To get rid of this coefficient, you need to multiply each coefficient by 2.

The balanced equation:

4 NH₃ (g) + 3 O₂ (g) ----> 2 N₂ (g) + 6 H₂O (g) + energy

Reactants: 4 nitrogen, 12 hydrogen, 6 oxygen

Products: 4 nitrogen, 12 hydrogen, 6 oxygen

Now, all of the elements are equal on both sides and there are no 1/2 coefficients. These are the smallest whole-number coefficients because some of the numbers cannot be further simplified (3).

Answer:

2.0 moles S

Explanation:

To find the number of moles of S, you need to convert the moles Na to moles S via the mole-to-mole ratio. This ratio is represented by the coefficients in the balanced equation. Because you wish to find moles S, you want to put this number in the numerator. Because you want to eliminate the moles Na, this number should be in the denominator.

2 Na + 1 S ---> Na₂S

4.0 moles Na             1 mole S
----------------------  x  ---------------------  =  2.0 moles S
                                 2 moles Na

The structure of the compound, there will be ten unique signals in the carbon 13 NMR of the compound.

The NMR signals shows the atoms in a compound that are in unique chemical environments. The atoms that are in the same chemical environment will only give one signal.

Based on the structure of the compound, there will be ten unique signals in the carbon 13 NMR of the compound.

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Answer:

27.50 g

Explanation:

Unless weight was somehow gained/lost during the reaction, the products should weigh as much as the reactants. Since this isn't specified the mass of the reactants should be equal to the mass of the products.

Answer:

1.24×10^6/6.2×10^-3

200

acc to scientific notation: 0.2×10^3 is the answer

Explanation:

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The observations are as follows:

When a mixture of iron fillings and sulfur are heated, black iron (ii) sulfide is formed.

Unlike iron fillings, black iron (ii) sulfide is not attracted to a magnet.

When carbon sulfide is added to it, no visible reaction is observed.

When dilute hydrochloric acid is added to it, a gas with a rotten-egg smell is evolved.

The gas is hydrogen sulfide which is a reducing agents and acidic in nature.

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Taking into account the definition of density, the density of the glucose is 1.03 [tex]\frac{g}{mL}[/tex].

Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.

In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance. Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

[tex]density=\frac{mass}{volume}[/tex]

From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.

In this case, you know that:

Replacing in the definition of density:

[tex]density=\frac{20.6 g}{20 mL}[/tex]

Solving:

density= 1.03 [tex]\frac{g}{mL}[/tex]

In summary, the density of the glucose is 1.03 [tex]\frac{g}{mL}[/tex].

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The mass of NO produced is 9.3 g; option D.

The mass of nitrogen (ii) oxide, NO, produced from the reaction is determined from the mole ratio of the reaction.

The mole ratio of ammonia to oxygen from the equation of the reaction is 4 : 5.

moles of oxygen = 11.8/32 = 0.368

moles of ammonia = 8.3/17 = 0.488

Oxygen is the limiting reactant.

Mass of NO produced = 0.369 * 4/5 * 30 = 9.4 g NO

In conclusion, approximately 9.3 g of NO is produced.

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Answer:

0.5 M

Explanation:

Molar concentration : M = n/v

n = moles of solute

v = liters of solution

Hence, 5.0 / 10.0 = 0.5 M

Answer:

they are metals so they are:-

-malleable

-ductile

because metallic bonding is the same in all direction throughout the solid

Answer:

1482.6 J

Explanation:

353 cal * 4.2 J / 1 cal = 1482.6 J

An ice cube absorbs 353 cal of energy from its surroundings. Number of joules of energy is 1482.6 Joules.

The ability to do work is called as energy. Work done is product of force and displacement. Energy is of different types as sound energy, kinetic energy, potential energy, electrical energy, light energy etc.

Law of conservation of energy states that energy can neither be created nor destroyed, but it can be transferred from one form to another.

Molecules can move so they show kinetic energy, molecules can be there at many positions so they can show potential energy, molecules can vibrate so they can show sound energy but molecules can only absorb light hence they can't have light energy.

1 calorie of energy has 4.2 Joules.

Given, 353 Calories of Energy

Hence, 353 Calories of Energy has 1482.6 Joules.

Therefore, An ice cube absorbs 353 cal of energy from its surroundings. Number of joules of energy is 1482.6 Joules.

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CaF₂ ⇒ Ca²⁺ + 2F⁻

1.75       1.75     3.5

Answer:

1kg gold because when it's mined it needs stronger machines

1kg gold because when it's mined it needs stronger machines.

The amount of space occupied by a three-dimensional figure as measured in cubic units.

Gold is called a heavy metal because of its high density, which comes from the fact that each of its atoms is individually very heavy.

Hence, 1kg gold because when it's mined it needs stronger machines.

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When we convert 9.15 Calories to joules, the result obtained is 38.28 Joules

From the question given above, the following data were obtained:

The conversion scale to convert calories to joules is given below:

1 Calorie = 4.184 Joules

Using the above scale, we can convert 9.15 calories to joules as shown below:

1 Calorie = 4.184 Joules

Therefore,

9.15 Calories = (9.15 Calorie × 4.184 Joules) / 1 Calorie

9.15 Calories = 38.28 Joules

Thus, we can conclude from the above calculation that the energy in joules is 38.28 Joules

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Answer:

38,200J

Explanation:

 9.15 x 4.18 x 1000= 38,247 → 38,200J

Answer:

Sometimes peoples like to say that atom is like a cell in living things,is it true?comment below,letss goo!!

Explanation:

A greek philosopher known as Democritus was the first to consider the idea that matter is made up of small particles ,about 400BC.

Since there was no experimental evidence to support his idea,it was not accepted.

About 2000 years later an English man called John Dalton revived the discussion.He used experimental evidence to support his idea to convince people that matter is made up of particles called atoms.It accepted!.

An English man called John Dalton revived the discussion.He used experimental evidence to support his idea to convince people that matter is made up of particles called atoms.It was accepted ,he conclude the following theories:

From the calculation, the molar mass of the solution is 141 g/mol.

We know that;

ΔT = K m i

K = the freezing constant

m = molality of the solution

i = the Van't Hoft factor

The molality of the solution is obtained from;

m = ΔT/K i

m = 3.89/5.12 * 1

m = 0.76 m

Now;

0.76 =  26.7 /MM/0.250

0.76 = 26.7 /0.250MM

0.76 * 0.250MM =  26.7

MM= 26.7/0.76 * 0.250

MM = 141 g/mol

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Answer:

With too little air, the gas mixture will not burn completely and will form tiny carbon particles that are heated to glowing, making the flame luminous. With too much air, the flame may burn inside the burner tube; that is, it may strike back.

Taking into account the definition of dilution, the molarity of the unknown solution is 0.133 M.

Dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.

In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.

A dilution is mathematically expressed as:

Ci×Vi = Cf×Vf

where

In this case, you know:

Replacing in the definition of dilution:

Ci× 10.5 mL= 0.172 M× 80 mL

Solving:

Ci= (0.172 M× 80 mL)÷ 10.5 M

Ci= 0.133 M

In summary, the molarity of the unknown solution is 0.133 M.

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Answer:

0.000019952mol/dm3

Explanation:

pH=-log(H+)

4.7= -log(H+)

log(H+)=-4.7

(H+)=10*-4.7=0.000019952

Answer: d. You would decrease the pressure

Explanation:

If the temperature of a gas is held constant, the pressure and volume vary inversely.

If the gas's temperature remains constant, then increase the volume of the gas with a decrease in the pressure. Therefore, option (D) is correct.

Boyle’s law can be described as at a constant temperature, the pressure exerted by a given mass of gas being inversely proportional to the volume occupied by the gas.

The pressure and volume of a gas at a particular temperature have an inverse relationship.

P ∝ 1/V

or   P₁ .V₁ = P₂. V₂                                                             ................ (1)

Where the initial and final pressure of the gas is P₁ and  P₂ respectively.  The initial and final volume of the gas is V₁ and  V₂ respectively at temperature 'T'.

Therefore, if we keep the temperature of the gas constant. them the volume of the gas will increase only if we decrease the pressure of the gas.

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the formula: MCl₂

name of the product formed: chloride salt + hydrogen

Answer:

a) formula for citric acid is - C6 H8 o7

b) lime water turns opaque after adding co2 due to the formation of calcium carbonate.

c) reaction 3 is displacement reaction where a high reactive metal displace a less reactive from its salt solution.

d) reaction 1) is combination reaction where two reactant combines to give a single product whereas reaction 2) is decomposition reaction where a single reactant splits into more that 1 products.

Answer:

A rule of thumb is that 1.5 lbs. of baking soda per 10,000 gallons of water will raise alkalinity by about 10 ppm. If your pool's pH is tested below 7.2, add 3-4 pounds of baking soda. If you're new to adding pool chemicals, start by adding only one-half or three-fourths of the recommended amount.

A homogenous mixture is that mixture in which the components mix with each other and its composition is uniform throughout the solution. A heterogenous mixture is that mixture in which the composition is not uniform throughout and different components are observed.

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Answer:

your cool

Explanation:

Answer:

speed and direction are the two things

Answer:

Ethyl magnesium Bromide