Given the chemical equation: SiO2 (s) + 4KF(g) --> SiF4(g)+ 2H2O(l) Delta H= -184kJ
How much heat is released in the formation of 75.0 g of water?

ANSWER

T

EXPLANATION

Given that;

The mass of the object is 9.6 grams

The volume of the object is 3.2mL

Follow the steps below to find the density of the object

Substitute the given data into the formula above

Convert the volume of the object to cm^3

Recall, that 1mL is equivalent to 1cm^3

Hence, 3.2mL is 3.2 cm^3

Therefore, the density of the object is 3.00 g/mL

Balanced  equation of C3H8O3 + O2 = CO2 + H2O is 2C3H8O3 + 7O2 → 6CO2 + 8H2O

Balance the equation C3H8O3 + O2 = CO2 + H2O using the algebraic method.

            aC3H8O3 + bO2 = cCO2 + dH2O

         C: 3a + 0b = 1c + 0d

         H: 8a + 0b = 0c + 2d

         O: 3a + 2b = 2c + 1d

       3a - 1c = 0

       8a - 2d = 0

       3a + 2b - 2c - 1d = 0

      a = 2 (C3H8O3)

      b = 7 (O2)

      c = 6 (CO2)

      d = 8 (H2O)

               2C3H8O3 + 7O2 = 6CO2 + 8H2O

                   Reactants       Products

              C    6                   6

              H   16                16

              O   20                 20

Since there is an equal number of each element in the reactants and products of 2C3H8O3 + 7O2 = 6CO2 + 8H2O, the equation is balanced.

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Kelvin temperature will the reaction proceed 4.50 times faster than it did at 315 K is 293K

Temperature is the degree of hotness or coldness of an object

Here given data is certain reaction has an activation energy of 36.11 kJ/mol and reaction proceed 4.50 times faster than it did at 315 K and we have to find kelvin temperature = ?

Then, we have to use the arrhenius equation and set k1 = 1 and k2 = 4.50 because rate = k[A] so as long as concentration of reactants doesn't vary, rate is proportional to k

ln (k₂/k₁) = Ea/R(1/T₁ - 1/T₂)

k₂ = 4.50

k₁ = 1

Ea = 36.11 J/mole

R = 8.314 J/mol⁻k

T ₁= 315 K

T₂ = ?

ln(4.50/1) = 36.11/8.314 (1/314 - 1/T₂)

1.50 = 4.343 (1/315 - 1/T₂)

1.50 = 0.013 - 4.343/T₂

-1.48 = - 4.343/T₂

T₂ = 293 K

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Concave shape of Wave Rock is the physical evidence that supports the evolution of Earth due to deposition.

The concave shape of Wave Rock is nice physical evidence of deposition in the Earth's evolution. It is a 2.7-billion-year-old land structure that served as the foundation for the formation of the Australian continent.

A naturally occurring rock formation that resembles a tall, breaking ocean wave is called Wave Rock. The "wave" is roughly 110 m (360 ft) long and 15 m (49 ft) tall. It makes up the north side of the isolated hill known as "Hyden Rock."

Since Wave Rock is made of much tougher material from its surroundings, the weathering lowered the surrounding terrain while the bedrock remained to serve as a witness for the past.

The structure of Wave Rock was created by the weathering of the surrounding area, and this is exactly what proves the deposition part. Wave Rock was below the ground because of the deposition of the material around it over time.

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Complete Question

Which physical evidence supports the evolution of Earth due to deposition?

A) Red color of Thor's Hammer

B) Concave shape of Wave Rock

C) Streaks on the face of Wave Rock

D) Broader tip than base of Thor's Hammer

Explanation:

The law of conservation of mass:

In a chemical reaction, the mass is neither created nor destroyed. In other words, the mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction.

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According to this task, the statement that demonstrates the law of conservation of mass is:

Answer: there are 10 aluminum (Al) atoms represented on each side of the equation.

Molecular mass of Phenol = 94 g/mol

Ethanol = 46 g/mol

Weight of Phenol Taken = 25.5 g

Ethanol = 495 g

Total Weight = 495 + 25.5 = 520.5 g

So moles of phenol = 25.5 94 = 0.27

mole of ethanol = 495 / 46 = 10.76

1.  Mole fraction of phenol = 0.27 / (10.76 + 0.27) = 0.27 / 11.03 = 0.0244

2. Mass % of phenol = mass of phenol / total mass x 100

25.5 / x 10.5 = 4.9 %

3. Molar concentration of phenol = mol Phenol/mass of solvent (kg)

the solvent is ethanol =>  Because presents an exceedingly high amount

0.27 / 495 X 1000 m = 0.54m

4. Molarity = moles of phenol/ vol of solution (in liter)

Density of solution = 0.938 g/mL 44

Mass of solution = 520.5 g

Volume of Solution = Mass / Density = 520.5 / 0.938 = 554.9 or 555 ml

Molarity = (0.27 / 555)X 1000 = 0.48 M.

Phenol has unique properties and is not classified as alcohol. They are highly acidic because the aromatic ring is tightly bound to oxygen and the bond between oxygen and hydrogen is relatively loose.

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According to Le Châtelier's principle, if a dynamic equilibrium is disturbed by changing the conditions, the equilibrium position will move to compensate for the change and restore the equilibrium.

Le Chatelier's Principle states that "a system at equilibrium will modify itself in such a way to minimize the effect of that change made in it" when external stress is applied by changing concentration, pressure, or temperature.

Change in Concentration:

A  +  B    ⇆    C

In order to counteract the impact of the additional reactant added, the equilibrium will shift forward and produce more product when the concentration of reactants (A or B) is increased. Or it will react in the opposite way if product (C) is added.

Change in Pressure:

A  +  B    ⇆    C

Because there is a decrease in volume at the product side, if pressure is applied to this equilibrium, the equilibrium will shift in the direction of forwarding motion (1 mole as compared to reactants which are 2 moles). If the pressure drops, the opposite situation will be seen.

Change in Temperature:

A  +  B    ⇆    C  + Heat

The heat produced in this exothermic reaction (heat is evolved) is on the product side. The equilibrium will shift in the opposite direction as the temperature rises. A drop in temperature will cause the equilibrium to move forward.

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Answer:

Argon - Ar has 18 electrons

An ion that has 18 electrons is a potassium ion.

Hope this helps!

Explanation:

From the mole ratio and the masses of reactants:

The maximum amount of the product that can be formed is calculated from the equation of reaction as follows:

The mole ratio of hydrogen to nitrogen is 3 : 1

From the given data:

4.67 grams of hydrogen gas are allowed to react with 4.67 grams of nitrogen.

The moles of the reactants is determined as follows:

Moles of hydrogen = 4.65/2 = 2.325 moles

Moles of nitrogen = 4.67/28 = 0.1667 moles

Hence, the limiting reagent is nitrogen while the excess reagent is hydrogen.

The maximum moles of ammonia (NH₃ ) that can be formed = 0.1667 moles.

mass of ammonia formed = 0.1667 * 17 grams

mass of ammonia formed = 2.83 g

The moles of the excess reagent remaining after the reaction is complete = 2.325 - (0.1667 * 3) = 1.825

moles of the excess reagent remaining = 1.835 moles

mass of the excess reagent remaining = 1.825 * 2

mass of the excess reagent remaining = 3.65 grams

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The density of the unknown liquid 1.88kg/m³

The density of a liquid is a measure of how heavy it is for the amount measured and if you weigh equal amounts or volumes of two different liquids, the liquid that weighs more is more dense and if a liquid that is less dense than water is gently added to the surface of the water, it will float on the water

Here given data is cylinder weighs 26.145 g and when the cylinder contains 48.3 of an unknown liquid and it weighs 65.055 g then we have to find density of the unknown liquid = ?

So density = mass/volume

cylinder weighs + liquid weighs = 91.2g

Density = 91.2g/48.3

Density = 1.88kg/m³

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Answer: Carbon strengthens iron by distorting its crystal lattice. This distortion is similar in effect to work hardening.

Answer:

C is the answer

Explanation:

Li2CO3 + HCl - - - - - - -> LiCl + H2O + CO2

Li. Li. H. Li. H. H. C

C Cl. Cl. O. O. O

O. O. O

2 Li ------>1Li so we put 2 in front LiCl on the right side to make 2Li---->2Li.

1H------->2H so we put 2 in front HCl on left side to make

Li2CO3 + 2HCl - - - - - - -> 2LiCl + H2O + CO2

Taking into account the reaction stoichiometry, 45.35 grams of copper(II) chloride are needed to produce 42.8 g copper(II) phosphate in the presence of excess sodium phosphate.

In first place, the balanced reaction is:

3 CuCl₂ + 2 Na₃PO₄ → Cu₃(PO₄)₂ + 6 NaCl

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: if by reaction stoichiometry 380.62 grams of Cu₃(PO₄)₂ are produced by 403.32 grams of CuCl₂, 42.8 grams of Cu₃(PO₄)₂ are produced by how much mass of CuCl₂?

mass of CuCl₂= (42.8 grams of Cu₃(PO₄)₂× 403.32 grams of CuCl₂) ÷380.62 grams of Cu₃(PO₄)₂

mass of CuCl₂= 45.35 grams

Finally, 45.35 grams of CuCl₂ is required to produce 42.8 g copper(II) phosphate.

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The empirical formula of the compound is CH₂O.

The empirical formula of a compound is the simplest formula of a compound showing the elements in the compound combined in their simplest mole ratios.

The empirical formula is determined from the simplest whole number mole ratio in which the elements in the compound combine.

The empirical formula of the compound is calculated below as follows:

mole of carbon = 0.250

mole of hydrogen = 0.50

moles of oxygen = 0.250

Diving by the smallest ratio to convert to whole number ratios

mole ratio of carbon to hydrogen to oxygen will be:

C = 0.25 / 0.25 = 1

H = 0.50 / 0.25 = 2

O = 0.25 / 0.25 = 1

Empirical formula = CH₂O

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If 10.5 g of Ag and 7.5 g of S are reacted and 9.8 g of  [tex]Ag_2S[/tex] is obtained, the percent yield of the reaction would be 81.4%

Ag and S react to form [tex]Ag_2S[/tex] as follows:

[tex]2Ag + S -- > Ag_2S[/tex]

The mole ratio of Ag to S is 2:1.

10.5 g of Ag = 10.5/108

                     = 0.0972 moles

7.5 g of S = 7.5/32

                = 0.2344 moles

In other words, Ag is limiting in availability.

The mole ratio of Ag to  [tex]Ag_2S[/tex] = 2:1

0.0972 Ag is equivalent to 0.0972/2 = 0.0486 moles of  [tex]Ag_2S[/tex]

0.0486 moles  [tex]Ag_2S[/tex] weighs = 0.0486 x 247.8

                                              = 12.04 grams

percent yield of  [tex]Ag_2S[/tex] = 9.8/12.04 x 100%

                                   = 81.4%

The percent yield of [tex]Ag_2S[/tex] that the chemist actually obtained is 81.4%.

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The percent yield of the reaction is calculated as follows:

Percent yield = actual yield/ theoretical yield * 100 %

The percent yield of the reaction is less than 100%.

The percent yield of a reaction is the ratio of the actual yield of a reaction and the theoretical yield of the reaction.

Mathematically:

The percent yield of any reaction is never 100& percent because no reaction actually goes to completion forming exactly all the product that is expected.

Considering the give reaction of the formation of nitric acid in the atmosphere:

The equation of the reaction is:

4 NO (g) + 3 O₂ (g) + 2 H₂0 (g) ---> 4 HNO₃ + excess oxygen.

The percent yield will require the actual yield and the theoretical yield in order to be calculated.

For example, if the actual yield is 12 g and the theoretical yield is 15 g, percent yield = 12/15 * 100%

Percent yield = 80%

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Transport of Na+ from a place of low concentration to a place of higher concentration. This is the right answer.

The sodium-potassium pump is the most common and well-known example of active transport. At the cell membrane, the sodium-potassium pump moves 3 sodium ions out of the cell and two potassium ions into the cell per ATP. Examples of active transport include the uptake of glucose in the human intestine and the uptake of minerals and ions into the root hair cells of plants.

One of the greatest examples of active transport is the movement of calcium ions out of cardiomyocytes. Cells secrete proteins such as enzymes, antibodies, and various other peptide hormones. Amino acids are transported across the intestinal mucosa of the human intestine. The movement of ions or molecules across cell membranes to regions of a higher concentration is assisted by enzymes and requires energy.

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Answer:

valence electrons

Explanation:

they are the electrons that are in the outermost shell

According to the given data The enthalpy for the reaction, ΔH rxn is 255.95 kJ/mol.

Enthalpy is a characteristic or state function which resembles energy; it has the same dimensions as energy and is thus measured in joules or ergs. The value of enthalpy is entirely determined by the temperature, pressure, and content of the system, not on the history.

Calculate the change in enthalpy for the reaction

CH₄(g) + NH₃(g) → HCN(g) +3H₂(g)

From the given reactions

Reaction 1: N₂(g) + 3H₂(g) → 2NH₃(g) Change in enthalpy: -91.8 kJ/mol

Reaction 2: C(s, graphite) + 2H₂(g) → CH₄(g) Change in enthalpy: -74.9 kJ/mol

Reaction 3: H₂(g) +2C(s, graphite) +N₂(g) → 2HCN (g) Change in enthalpy: +270.3 kJ/mol

Reactions 1 and 2 to get reaction 4 and 5 respectively

Reaction 4: 2NH₃(g)  → N₂(g) + 3H₂(g)                 ΔHo : 91.8 kJ/mol

Reaction 5: CH₄(g) → C(s, graphite) + 2H₂(g)       ΔHo : 74.9 kJ/mol

Now, multiply reactions 4 and 3 by half (1/2) to get 6 and 7 respectively

Reaction 6: NH₃(g)  → ¹/₂N₂(g) + ³/₂H₂(g)                           ΔHo : 45.9 kJ/mol

Reaction 7: ¹/₂H₂(g) +C(s, graphite) +¹/₂N₂(g) → HCN (g)   ΔHo : +135.15 kJ/mol

Now,

Add reactions 5, 6, and 7 together  

Reaction 5: CH₄(g) → C(s, graphite) + 2H₂(g)                    ΔHo : 74.9 kJ/mol

Reaction 6: NH₃(g)  → ¹/₂N₂(g) + ³/₂H₂(g)                           ΔHo : 45.9 kJ/mol

Reaction 7: ¹/₂H₂(g) +C(s, graphite) +¹/₂N₂(g) → HCN(g)    ΔHo : +135.15 kJ/mol

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

CH₄(g) + NH₃(g) → HCN(g) + 3H₂(g)                             ΔH rxn = 255.95 kJ/mol

The enthalpy for the reaction, ΔH rxn is 255.95 kJ/mol

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The percent yield is 85.16%

Percent yield is the percent ratio of the weight of the product obtained to the theoretical yield and we calculate the percent yield by dividing the experimental yield by the theoretical yield and multiplying the result by 100 to express the final answer in %

Here given data is carbon disulfide (CS₂) reacts with excess chlorine (Cl₂) to produce carbon tetrachloride (CCl₄) and disulfur dichloride (S₂Cl₂) if 73.5 g of CS₂ yields 86.3 g of CCl₄ means reaction is

CS₂ + Cl₂ → CCl₄ + S₂Cl₂

And here weight are given CS₂ = 73.5 g and CCl₄ = 86.3 g

So, % yield =  ratio of the weight

% yield =   73.5 g/86.3 g×100

% yield = 85.16%

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Answer:

12.1 grams and 77.8%

Explanation:

(Note: in this answer, sig figs are rounded in the end, not along the way) The molar ratio of calcium sulfate to calcium hydroxide is 1:1
there are 6.56 grams of calcium hydroxide, so the number of moles is the number of grams / the molar mass, which is (6.56 grams) / (74.093 g/mole)
=0.08854 moles of calcium hydroxide
Theoretically, 0.08854 moles of calcium hydroxide would make 0.08854 moles of calcium sulfate.
To find the number of grams of calcium sulfate, multiply the number of moles by the molar mass, which is .08854 * 136.14 = 12.054 grams, or
12.05 grams
The percentage yield of calcium sulfate is just the actual yield / predicted yield, which is 9.37/12.05 which is 0.7776, or 77.8%

Answer:

D.) mole, 6.022 x 10²³

Explanation:

Avogadro's Number is a ratio which states that there are 6.022 x 10²³ particles per every one mole.

Br2 represents both an element and a molecule.

A molecule is defined as a group of atoms bonded together. An element is defined as a substance that cannot be chemically broken down further into simpler substances. Br2 is only bromine and it is two bromine atoms boned together to form a molecule.

The net momentum if North is the positive direction is 20,000Kgm/s.

Momentum can simply be defined as the product of the mass of a particle and its velocity.

Momentum is a vector quantity that possesses a magnitude and a direction.

The Formula of momentum is given below:

Momentum, p = m * v

where;

m is the mass and v is the velocity of the body.

S.I. unit of momentum is kgm/s.

We have the given data as follows:

m1 = 500 kg

v1 = 30 m/s

m2 = 200 kg

v2= 25 m/s

Momentum = m1v1 + m2v2

= (500 * 30) + (200 * 25)

= 15000 + 5000

= 20,000 kgm/s

Momentum = 20,000Kgm/s.

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Answer: 79.5

Explanation:  Every positive exponent moves the decimal one place to the right.  So if you are multiplying by one less decimal to get the same answer your starting number would have to be one place greater to the right.  

If your exponents are negative numbers the decimal moves one place per each number to the left.  You'll learn that later.  Math is a blast!  Enjoy it!  

Lewis structures for all reactant and product molecules and the show the bonding relationship between atoms of a molecule and the lone pairs of electrons in the molecule

Lewis structure for the reactants and product molecules can be drawn by following the octet rule and considering covalent bonding between the bonded atoms

Here given reaction is

Cl₂(g) + F₂(g) → 2CIF(g)

And lewis structure of reactant means Cl₂(g) + F₂(g) in Cl₂(g) one chlrine has three lone pair attached and another clorine also three lone pair attached whereas F₂(g) also has three pair of lone pair are attached and product means CIF(g) has Cl has three lone pair and F also has three lone pair attached

Lewis structures for all reactant and product molecules are given below

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a.) 4.04E-5 moles of acidic protons

b.) 2.02E-5 mole of H2B in the fruit drink

A proton can be defined  as a stable subatomic particle with symbol p , H⁺, or ¹H⁺ that has a positive electric charge of +1 e elementary charge.

The mole with its symbol mol, is the unit of amount of substance in the International System of Units. The quantity amount of substance is a measure of how many elementary entities of a given substance are in an object or sample.

The formula for the number of moles formula is expressed as follows;

Number of moles = Mass of substance / Mass of one mole.

n = m/M

from the given above, we have that

mass of sample = 1.00g

a.)  Moles of acidic protons due to H2B in the fruit drink sample will be

6.04E-5 moles of acidic protons -  2.00E-5 moles were due to VC

= 4.04E-5 moles of acidic protons.

b.) Moles of H2B in the fruit drink sample = 2.02E-5 mole of H2B in the fruit drink

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An oxidation number is a number assigned to an atom that allows chemists to keep track of how many electrons are available for transfer and whether a particular reactant is being oxidized or reduced in a reaction.

Determine if the substance in question is an element. An unbonded free atom always has an oxidation number of 0. An oxidation number is a number assigned to a compound or element to indicate the number of electrons that have been lost or gained. A negative number indicates that an electron was gained and a positive number indicates that an electron was lost.

Determine if the substance in question is an ion. Aeon has an oxidation number corresponding to the charge. This applies to both ions that are not bonded to other elements and ions, which are part of the ionic compound. The oxidation number explains the ability of elements or compounds that provides or obtain electrons during a chemical reaction.

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