75.0 g sample of a metal at 65°C is added to 100.0 g of water at 20.0°C. The temperature of the water rises to 22.3 °C. Calculate the specific heat of the metal, assuming that all the heat lost by the metal is gained by the water.

Answer:

See below

Explanation:

    Use Ideal Gas Law

  PV = n RT          using R = .082057366 l-atm/k-mol

                                           T must be in Kelvin

                         solve for 'n'

  .92 * 1.6  = n  * .082057366 * 287

          n = .0625 moles

then the mole weight:    .0625 * x = .314

                                             x = mole weight = 5.025 gm

"Systems with either very low pressures or high temperatures enable real gases to be estimated as “ideal.”  "

The ideal gas equation estimates the molar mass of the substance with the help of the moles. The molar mass of 0.314 gm sample and 1.6 L volume is 0.503g/mol.

The gas is said to be ideal at low pressure, and high-temperature conditions as the potential energy and the molecular size become negligible because of the intermolecular forces.

The ideal gas equation is given as,

PV = nRT

Given,

Pressure (P) = 0.92 atm

Volume (V) = 1.6 L

Gas law constant (R) = 0.0821

Temperature (T) = 287 K

Mass of sample = 0.314 gram

No. of moles = n

The moles are calculated as:

PV = nRT

0.92 × 1.6 = n × 0.0821 × 287

1.47 = 23.56 × n

n = 1.47 ÷ 23.56

n = 0.624 moles

Now, from moles, the molar mass is calculated as,

Molar mass = mass ÷ moles

Molar mass = 0.314g ÷ 0.624mol

Molar mass = 0.503 g/mol

Therefore, 0.503g/mol is the molar mass of the 0.314 gm sample.

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The nuclear binding energy per mole if the mass defect of a certain isotope is 0.1303 g per mol is [tex]3.909\times10^{7}\\[/tex]

What is the mass defect?

The difference between the total mass of a nucleus and the sum of the masses of all its constituent nucleons is known as the mass defect of the nucleus.

              [tex]BE=\Delta mc^{2}[/tex]

Here,

The mass defect Δm is 0.1303g per mol

Therefore,

[tex]BE=\Delta mc^{2}\\BE=0.1303\times 3\times10^{8}\\BE=0.3909\times10^{8}\\BE=3.909\times10^{7}\\[/tex]

Hence, the nuclear binding energy per mole if the mass defect of a certain isotope is 0.1303 g per mol is [tex]3.909\times10^{7}\\[/tex]

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12 g CH3OH are produced when 14 grams of carbon monoxide reacts with 1.5 grams of hydrogen gas.

Writing the balanced equation for the reaction taking place:

CO(g) + 2H2(g) ⇒ CH3OH

Finding the limiting reactant:

moles CO present ⇒ 14 g x 1 mol CO / 28 g = 0.5 moles CO

moles H2 present ⇒ 1.5 g x 2 mol H2 / 2 g = 0.75 moles H2O

Because according to the balanced equation it takes 2 moles of H2 for every 1 mole CO, there isn't enough H2, so it is limiting and will dictate how much CH3OH can be made.

Mass of CH3OH produced

= 0.75 moles H2 x 1 mol CH3OH / 2 mol H2 x 32 g CH3OH / mol

=  12 g CH3OH

A synthesis response is a sort of reaction in which a couple of reactants combine to form a single product. it's a kind of chemical reaction wherein two or extra simple materials combine to shape a more complicated product.

it is surely a matter of creating connections or placing things collectively. We synthesize statistics evidently to help others see the connections between things. For example, whilst you document to a pal the matters that numerous other pals have said approximately a tune or movie, you're carrying out a synthesis.

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Answer:

See below

Explanation:

ΔQ = m c T        ΔQ = heat required(J)    m = mass (g)    T = C° temp change

                             c = heat capacity in J/g-C

The value of Kb of the unknown amine is 3.22 x 10^-4.

Weak electrolytes:

The compound which do not dissociate completely when added to the aqueous solution are called weak electrolytes. The electrolyte and its ions exists in equilibrium. In case of weak base, the equilibrium constant is expressed as Kb.

Calculations:

Step 1:

The percentage of amine ionized at equilibrium is 2.2%.

NH3   +     H2O ------>    NH4+   +    OH-

The concentration of conjugate acid at equilibrium is calculated as:

2.2 = (x/0.65) x 100

x = 0.0143 M

Step 2:

The equilibrium constant (Kb) is calculated as:

Kb = x^2/0.65 - x

= (0.0143)^2/(0.65 - x)

= 3.22 x 10^-4

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Answer:

C.) H₂O and CO₂

Explanation:

A product is what is created during reaction (the things on the right side of the chemical equation). A combustion reaction always forms water, carbon dioxide, and heat. In this case, the equation looks like this:

2 C₂H₆ +7 O₂ ----> 6 H₂O + 4 CO₂

The freezing point depression when sugar is dissolved in water to make a 0.50 molal solution is 0.93 °C.

The freezing point depression of a solvent is calculated using the formula below:

Where:

The Van’t Hoff factor for sugar = 1

m = 0.50

Substituting the values:

ΔTf = −1 ×1.86 × 0.50m = − 0.93°C

In conclusion, the freezing point of water is depressed by 0.93 °C.

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The Average atomic weight of X is 28.7amu

Isotopes are atoms with the same number of protons but differing numbers of neutrons.

Different isotopes have various atomic masses.

The proportion of atoms with a particular atomic mass that can be found in a naturally occurring sample of an element is known as the relative abundance of an isotope.

An element's average atomic mass is computed as a weighted average by multiplying the relative abundances of its isotopes by their respective atomic masses, then adding the resulting products.

Using mass spectrometry, it is possible to determine the relative abundance of each isotope.

The atomic weight of the element will be a weighted average of the isotopes based on the relative abundance:

(27.730 x 0.6058) + (28.841 x 0.1835) + (31.321 x 0.2107) = 16.7988 + 5.2923+ 6.599 = 28.690 = 28.7 amu.

Average atomic weight of X is 28.7amu

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1.5 mol is the theoretical yield of aluminum oxide if 3.00 mol of aluminum metal is exposed to 2.55 mol of oxygen.

The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.

2Al + [tex]\frac{3}{2}[/tex] O₂ → Al₂O₃

4Al + 3O₂ → 2 Al₂O₃   [Balanced Chemical Equation]

When aluminium is the limiting reagent then
3.00 × [tex]\frac{1}{2}[/tex] = 1.5 mol

When oxygen is the limiting reagent then

2.55 × [tex]\frac{2}{3}[/tex] = 1.70 mol

Thus from the above conclusion we can say that 1.5 mol is the theoretical yield of aluminum oxide if 3.00 mol of aluminum metal is exposed to 2.55 mol of oxygen.

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The pH of this solution is 13.529.

Given:

Number of moles Ba(OH)₂ = 0.0550 moles

Volume = 325 mL

The calculation for moles:

[tex]Ba (OH)_{2}[/tex] → [tex]Ba^{2}[/tex]⁺ + [tex]2OH[/tex]

In 1 moles Ba(OH)₂  we have 2 moles OH-

In 0.0550 moles Ba(OH)₂  we have 2*0.0550 = 0.11 moles OH-

The calculation for concentration:

[OH-] = moles / volume

[OH-] = 0.11 moles / 0.325 L

[OH-] = 0.338 M

Calculation of pOH:

pOH = -log[OH-]

pOH = -log(0.338)

pOH = 0.471

Calculation of pH:

pH + pOH = 14

pH = 14 - pOH

pH = 14 - 0.471

pH = 13.529

Thus, the pH of this solution is 13.529.

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The subshell representation of an element of Group IV is option C. s² p², since it contains 4 valence electrons.

In the Periodic Table, the Groups are the columns. For the Main-group elements, the group number coincides with the number of electrons in the valence shell.

Which of the following could be the subshell representation of an element of Group IV?

A. s². No, since there are 2 valence electrons.

B. s² p³. No, since there are 5 valence electrons.

C. s² p². Yes, since there are 4 valence electrons.

D. s² p¹. No, since there are 3 valence electrons.

The subshell representation of an element of Group IV is option C. s² p², since it contains 4 valence electrons.

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Answer:

S

Explanation:

Reactivity goes UP as you go to the right or upward on the periodic table

  S is above and to the right of As     so we would expect it to be the more reactive  of the two.

The negative effect of technology on Healthcare:

Impersonal treatment, harmful health impacts, higher expenditures, the potential for overuse, and privacy violations are just a few of the negative effects of medical technology.                

Medical technology:

It refers to all technological tools or apparatus utilized to protect human life. Medical equipment such as an insulin pump, a wireless brain sensor, a blood glucose meter, a digital thermometer, pulse oximeters, smart inhalers, etc the tools which had helped patients receive better medical treatment.

Effects of Medical technology:

Medical technology, nevertheless, can potentially cause issues for the patient like:

1. Impersonal treatment: When a healthcare professional uses technology too frequently, they could spend less time getting to know the patient as a person and more time dealing with the equipment.

2. Harmful health impacts: Surgery, radiation therapy, and chemotherapy are a few examples of treatments that might be advantageous but also have risks.

3. Higher expenditures: Due to the research and marketing required to bring new technologies to market and to generate a profit for their creators and manufacturers, they may result in increased patient costs.

4. Potential for overuse: The use of a technology or new product by a medical professional may be encouraged by the manufacturer, regardless of whether it is in the patient's best interest.

5. Privacy violation: Electronic medical records (EMR), for example, collect and manage patient information. This new technology is convenient, but it also has the potential to be misused, compromising patient privacy and personal data.

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The new pressure is 81.675 torr

Since temperature and moles are held constant, we use Boyle's Law:

A gas law known as Boyle's law asserts that a gas's pressure is inversely proportional to its volume when it is held at a fixed temperature and of a given mass.

To put it another way, as long as the temperature and volume of the gas remain constant, the pressure and volume of the gas are inversely proportional to one another.

The Anglo-Irish chemist Robert Boyle proposed Boyle's law in the year 1662.

P1V1=P2V2. Simply plug in your values. The units can remain in torr. Converting to atmospheres is not needed.

(242 torr)(27.0 L)=P2(80.0 L)

P2=[(242)(27)]/80 = 81.675 torr

Hence The new pressure is 81.675 torr

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The balanced equation says that 2 moles C₂H₆ and 7 moles O₂ react together, i.e. in a ratio of 7:2 or 3.5 moles of O₂ to C₂H₆.

With molar masses 30.07 g/mol (C₂H₆) and 31.998 g/mol (O₂), the given quantities amount to

(19 g C₂H₆) × (1/30.07 mol/g) ≈ 0.63 mol C₂H₆

(115 g O₂) × (1/31.998 mol/g) ≈ 3.59 mol O₂

Now, 0.63/2 ≈ 0.32, and for every 0.32 mol C₂H₆ consumed, the reaction requires 7×0.32 ≈ 2.2 mol O₂. Then in order to consume all of the C₂H₆, the reaction would need 2×2.2 ≈ 4.4 mol O₂, which we don't have.

In other words, we have too much C₂H₆ and not enough O₂, so O₂ is the limiting reactant.

Nonmetals have the ability to attract electrons better than metals because they have a higher electron affinity or electronegativity than metals.

Electronegativity is the tendency, or a measure of the ability, of an atom or molecule to attract electrons and thus form bonds.

An element in the periodic table with a high electronegativity will automatically have a high electron affinity.

Metals (low electronegativity) are known to lose electrons to non-metals (high electronegativity), hence, nonmetals have the ability to attract electrons better than metals because they have a higher electron affinity or electronegativity than metals.

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P 15 atm

V₁ = 12x103 m3 -3 3 V₁ = 12x10 m" T₁ = 25°c T= 28815 K

P₁ = 1.52x10 Pa

Now, Finel quantities, T₂ = 35°C = 308.15 °K

V2= 851 = -3 3

Now

by ideal gas equation

P2Y2 T2

= PV, T2

1152 X106 x 12x16 3 x 308115 8,5×103 x 288,15 = Pa

=

21294×10 Pa

P₂ = 21264 Atm

final

pressure will be

21264 Adm.

Please check the attached file for a brief answer.

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Answer:

Your answer must be O Photosynthesis or Respiration because

Explanation:

Photosynthesis involves the usage of carbon in the form of carbon dioxide by plants and algae.

Respiration involve the release of carbon dioxide in the environment by living organisms.

Hope its helpful!

Answer:

Your answer must be O Photosynthesis

Explanation:

Self -driving cars are just like any other human invention. With respect to efficiency, every human invention has always been progressive. Hence, It is right to state that as far as ethical dilemmas  are concerned, there is nothing wrong with self-driving cars.

An ethical dilemma is a situation (more of a problem) where there is a conflict of tension between two opposition options each of which are not good ethically.

The above question is like asking, "why are C-19 vaccines not unethical?".

It is to be noted that most if not all inventions of man are amoral. Self-Driving cars are not intentionally created to destroy property or lives. As with most inventions, the damage is done in how they are used.

In the age of capitalism, there is yet to be any organization that is not biased economically in favor of itself.

The best that the government can do is to set up a team of industry experts that understand how the self-driving cars operate to audit, control, and check what cars are released for legal use on the streets.

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Answer:

Chemist Dmitri Mendeleev

With the use of formula, It will take 5.2 x [tex]10^{7}[/tex] hours for a 2. 50g sample to decay to the point where 0. 185 g of the isotope remains.

The half life of a substance to decay is the time taken for half of the atoms initially present in the element to decay.

From the question, It is given that the half-life of radium−226 is 1. 60 × 103 yr. To know many hours it will take for a 2. 50 g sample to decay to the point where 0. 185 g of the isotope remains, we can use both logic and formula to solve this.

With the use of Formula,

N = [tex](1/2)^{t/T}N_{o}[/tex]

Where

Substitute all the parameters into the formula

0.185 = [tex](1/2)^{t/1600}[/tex] x 2.5

0.185 / 2.5 = [tex](1/2)^{t/1600}[/tex]

0.074 = [tex](1/2)^{t/1600}[/tex]

Log both sides

Log(0.074) = Log[tex](1/2)^{t/1600}[/tex]

Log(0.074) = t/1600 Log(0.5)

t/1600 = Log(0.074) / Log(0.5)

t/1600 = -1.131 / -0.301

t/1600 = 3.7563

Cross multiply

t = 6010.13 years

Convert the year to hour

365 days = 1 year

24 hours = 1 day

24 x 365 = 8760 hours in one year

For 6010.13 years, there will be 6010.13 x 8760 = 52648738.8 hours

Which is 5.2 x [tex]10^{7}[/tex] hours.

Therefore, it will take 5.2 x [tex]10^{7}[/tex] hours for a 2. 50g sample to decay to the point where 0. 185 g of the isotope remains.

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Answer:

1.3 L

Explanation:

The volume of a rectangular cube can be calculated using the following formula:

Volume (L) = length (cm) x width (cm) x height (cm)

Keep in mind that 1 L = 1,000 cm³.

Before you can plug the values into the equation, you need to make sure they all have the same unit. Since the length is in meters (m), you need to first convert it to centimeters.

1 meter = 100 cm

 0.159 m           100 cm
---------------  x  ----------------  =  15.9 cm
                           1 m

Now, you can solve for the volume. To find the answer is the unit liters, you need to divide the volume by 1,000.

Volume = l x w x h

Volume = 15.9 cm x 10.5 cm x 7.7 cm

Volume = 1,285.5 cm³

Volume = 1.2855 L ------>  Volume = 1.3 L

The soluble copper chloride is obtained by evaporation and then by crystallization.

Copper chloride is a soluble salt that can be produced from the reaction between hydrochloric acid and copper oxide.

Soluble salts are obtained by crystallization.

The equation of the reaction is given below:

The soluble copper chloride is obtained by evaporation and then by crystallization.

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The spontaneous disintegration of a nucleus into a slightly lighter and more radioactive nucleus is accompanied by the emission of particles, electromagnetic radiation, or both.

Radioactivity is the phenomenon of the spontaneous disintegration of unstable atomic nuclei into atomic nuclei to shape greater energetically strong atomic nuclei.

Radioactive decay is a tremendously exoergic, statistically random, first-order system that occurs with a small amount of mass being converted to strength.

Spontaneous disintegration of a radionuclide with the emission of lively particles or radiation, consisting of alpha or beta debris or gamma rays.

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The balanced form of the chemical equation shown is N₂(g) + 3H₂(g) → 2NH3(g) (option A).

A chemical equation is said to be balanced when the number of atoms of each element on both sides of the equation is the same.

According to this question, the chemical equation between nitrogen and hydrogen is given as follows: N₂(g) + H₂(g) → NH3(g)

The balanced form of the chemical equation shown is N₂(g) + 3H₂(g) → 2NH3(g).

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The substances generated by the reaction are called products, and their formulas are placed on the right side of the equation.

A chemical reaction is a process in which chemical bonds between atoms to break and recognize, to form other new substances.

The substance which is present at the left hand side or start of a chemical reaction is known as Reactant.

The substance which is present at the right hand side or end of a chemical reaction is known as Product.

Example: Na + Cl → NaCl

Here Na and Cl are on the left hand side of a reaction so Na and Cl are reactants. Here NaCl is on the right hand side of a reaction so NaCl is product.

Thus from the above conclusion we can say that The substances generated by the reaction are called products, and their formulas are placed on the right side of the equation.

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1.98 g many grams of [tex]BaCrO_4[/tex] can be formed if a solution containing 1.63 grams [tex]BaCl_2[/tex] is added to a solution containing 2.40 grams of [tex]Na_2CrO_4[/tex].

A mole is defined as 6.02214076 × [tex]10^{23}[/tex]of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

[tex]BaCl_2 + Na_2CrO_4[/tex][tex]\rightarrow[/tex] [tex]BaCrO_4 + 2 NaCl[/tex]

Mass of [tex]BaCl_2[/tex] = 1.63 g

Molar mass of [tex]BaCl_2[/tex] = 208.23 g/mol

Moles of [tex]BaCl_2[/tex] = 1.63/ 208.23 = 0.0078 mol

Mass of [tex]Na_2CrO_4[/tex] = 2.40 g

Molar mass of [tex]Na_2CrO_4[/tex] = 161.97 g/mol

Moles of [tex]Na_2CrO_4[/tex]= [tex]\frac{mass}{molar \;mass}[/tex]

Moles of [tex]Na_2CrO_4[/tex] =[tex]\frac{2.40}{161.97 }[/tex]

=0.0148 mol

From the balanced equation mole ratio of [tex]BaCl_2[/tex] : [tex]Na_2CrO_4[/tex] = 1:1

But here, moles of [tex]BaCl_2[/tex] < moles of [tex]Na_2CrO_4[/tex]

Therefore, [tex]BaCl_2[/tex] is the limiting reagent.

From the balanced equation above it is clear that 1 mol of[tex]BaCl_2[/tex] reacts with 1 mol of [tex]Na_2CrO_4[/tex] to give1 mol of [tex]BaCrO_4[/tex].

Therefore, 0.0078 mol of [tex]BaCl_2[/tex] will produce 0.0078 mol of [tex]BaCrO_4[/tex].

Molar mass of [tex]BaCrO_4[/tex] = 253.37 g/mol

Therefore, the mass of [tex]BaCrO_4[/tex] can be formed = 0.0078 x 253.37 = 1.98 g

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The  absorption spectrum of an atom shows pattern of dark lines or bands attained by transmitting absorbed light beam into the spectroscope.

By sending an absorbed light beam into a spectroscope, one can create a pattern of black lines or bands.

The vapors or solution of a substance in the discharge tube are illuminated by a white light. After passing through a spectroscope, the transmitted light produces a spectrum of black lines at specific wavelengths. These shady lines match the light radiation wavelengths that the material has absorbed.

An atom, ion, or molecule absorbs photons with energies equal to the energy difference between the two states when it transitions from one to the other. An absorbance spectrum that depicts the intensity of emission as a function of wavelength is the end result.

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Answer:

u can just multiply 1

Explanation:

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