How many moles of sodium sulfate are present in .100 g of the compound?
2.126 x 10^-3 mol
174.3 mol
7.040 x 10^-4 mol

The volume of hydrogen gas produced in the reaction of 73 grams of zinc and 73 grams of hydrochloric acid (under normal conditions) is approximately 22.4 liters.

To calculate the volume of hydrogen gas produced in the reaction of zinc and hydrochloric acid, we need to use the principles of stoichiometry and the ideal gas law.

First, let's write the balanced chemical equation for the reaction between zinc (Zn) and hydrochloric acid (HCl):

Zn + 2HCl →\(ZnCl_2\)+ H2

From the equation, we can see that one mole of zinc reacts with two moles of hydrochloric acid to produce one mole of hydrogen gas. To determine the number of moles of zinc and hydrochloric acid, we need to convert the given masses into moles.

The molar mass of zinc (Zn) is approximately 65.38 g/mol, so 73 grams of zinc is equal to:

73 g Zn * (1 mol Zn / 65.38 g Zn) ≈ 1.116 mol Zn

Similarly, the molar mass of hydrochloric acid (HCl) is approximately 36.46 g/mol, so 73 grams of HCl is equal to:

73 g HCl * (1 mol HCl / 36.46 g HCl) ≈ 2.002 mol HCl

According to the balanced equation, the reaction produces one mole of hydrogen gas for every two moles of hydrochloric acid. Therefore, since we have 2.002 moles of HCl, we expect to produce half that amount, or approximately 1.001 moles of hydrogen gas.

To calculate the volume of hydrogen gas, we can use the ideal gas law, which states:

PV = nRT

Where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature. In this case, we assume the reaction is conducted under normal conditions, which means a pressure of 1 atmosphere and a temperature of 273.15 Kelvin.

Rearranging the equation to solve for V, we have:

V = nRT / P

Substituting the values, we get:

V = (1.001 mol) * (0.0821 L·atm/(mol·K)) * (273.15 K) / (1 atm) ≈ 22.4 L

Therefore, the volume of hydrogen gas produced in the reaction is approximately 22.4 liters.

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Answer:

Option 4, \(O^{2-}\)

Explanation:

Step 1:  Determine which option is correct

We know that Ne has 10 electrons therefore we need to find a different ion that has the same amount.  

Option 1 → Ca has 20 electrons and with 2+ we would remove 2 of those which would leave us with 18.

Option 2 → Cl has 17 electrons and with a - we would add 1 of those which would leave us with 18.

Option 3 → Li has 3 electrons and with a + we would remove 1 of those which would leave us with 2.

Option 4 → O has 8 electrons and with a 2- we would add 2 of those which would leave us with 10.  

Since the only one that matches up in the number of electrons is \(O^{2-}\) we can conclude that option 4 is correct.

Answer:  Option 4, \(O^{2-}\)

Answer: calcium ion

Explanation:

There are 0.84 moles of aluminum ions (Al3+) present in 0.42 mol of Al2(SO4)3.

To determine the number of moles of aluminum ions (Al3+) present in 0.42 mol of Al2(SO4)3, we need to consider the stoichiometry of the compound.

The formula of aluminum sulfate (Al2(SO4)3) indicates that for every 1 mole of the compound, there are 2 moles of aluminum ions (Al3+). This means that the mole ratio of Al3+ to Al2(SO4)3 is 2:1.

Given that we have 0.42 mol of Al2(SO4)3, we can calculate the moles of Al3+ as follows:

Moles of Al3+ = 0.42 mol Al2(SO4)3 x (2 mol Al3+ / 1 mol Al2(SO4)3)

Moles of Al3+ = 0.42 mol Al2(SO4)3 x 2

Moles of Al3+ = 0.84 mol Al3+

Therefore, there are 0.84 moles of aluminum ions (Al3+) present in 0.42 mol of Al2(SO4)3.

It's important to note that the stoichiometry of the compound determines the mole ratio between the different species involved in the chemical formula. In this case, the 2:1 ratio of Al3+ to Al2(SO4)3 allows us to determine the number of moles of Al3+ based on the given amount of Al2(SO4)3.

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The general equation for this reaction is as follows: CO3^2- + 2H+ → CO2 + H2O.

The test for trioxocarbonate (IV), also known as carbonate (CO3) ions, involves the reaction with an acid. When carbonate ions react with an acid, carbon dioxide gas (CO2) is produced, which can be observed through effervescence or bubbling. The general equation for this reaction is as follows:

CO3^2- + 2H+ → CO2 + H2O

In this equation, CO3^2- represents the carbonate ion, and H+ represents the hydrogen ion from the acid. The reaction produces carbon dioxide gas (CO2) and water (H2O).

For example, if hydrochloric acid (HCl) is used in the test, the reaction equation would be:

CO3^2- + 2HCl → CO2 + H2O + 2Cl-

In this case, the carbonate ions react with hydrochloric acid to produce carbon dioxide gas, water, and chloride ions.

It's important to note that the specific acid used in the test may vary depending on the experimental setup. Common acids used include hydrochloric acid (HCl), sulfuric acid (H2SO4), or acetic acid (CH3COOH).

The reaction equation remains the same, with the acid being consumed in the reaction and contributing to the formation of water and an anion corresponding to the acid used (such as chloride, sulfate, or acetate ions).

By observing the effervescence or bubbling produced during the reaction, we can confirm the presence of carbonate ions in the sample being tested.

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Solution :

Millimoles of hydrocyanic acid = 225 x 0.368

                                                   = 82.8

Millimoles of potassium cyanide = 225 x 0.360

                                                   = 81

Millimoles of sodium hydroxide = 51.3

Therefore,

pOH = pKb + log [salt - C / bas + C]

        = 4.74 + log[82.8 - 51.3 / 81 + 51.3]

         = 4.102

Therefore, pH = 9.05

Answer: 1:1

Explanation:

Since Na trades place with Na it makes it 1:1

The discovery of a 2-million-year-old fossil would align with the existing understanding of Earth's geological history, as it falls within the timeframe of the Quaternary period.

If scientists found a fossil in the middle layer that was determined to be 2 million years old, they would not automatically conclude that Earth was younger or older than 2 million years. The age of the fossil would provide valuable information about the minimum age of the layer in which it was found, but it would not necessarily provide conclusive evidence about the age of the entire Earth.

To determine the age of Earth, scientists rely on a variety of dating methods, including radiometric dating of rocks and minerals, as well as the study of isotopes and geological processes. These methods provide estimates of Earth's age in the billions of years.However, it would not significantly alter the prevailing scientific consensus that Earth is approximately 4.5 billion years old. The age of Earth is based on a comprehensive body of evidence from multiple disciplines and dating techniques, and a single fossil would not overturn that understanding.

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Answer: Carbon is the most important element to living things because it can form many different kinds of bonds and form essential compounds.

Explanation: The Chemical Basis for Life

Answer:

carbon is NOT the universal solvent

Explanation:

Answer:

droughts in California have become more common in California

Explanation:

Climate is weather over time which means that the first and the third one are just isolated incidents and the last answer choice shows climate but it doesn't show a change in climate

Answer:

only god knows

Explanation:

1. The volume of the stock solution needed is 0.008 L

2. The concentration of the diluted solution is 0.52 M

1. How to determine the volume of the stock solution

We can obtain the volume of the stock solution as follow:

M₁V₁ = M₂V₂

7 × V₁ = 0.480 × 0.120

5 × V₁ = 0.0576

Divide both side by 7

V₁ = 0.0576 / 7

V₁ = 0.008 L

Thus, the volume needed is 0.008 L

2. How to determine the concentration of the diluted solution

We can obtain the concentration of the diluted solution as follow:

C₁V₁ = C₂V₂

7 × 20 = M₂ × 270

140 = M₂ × 270

Divide both side by 270

C₂ = 140 / 270

C₂ = 0.52 M

Thus, the concentration is 0.52 M

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Answer:

.4998 atm    ( rounded to .5 atm   ) <===== not one of the answers listed

Explanation:

The partial pressure exerted by O2   is   equal to the fraction that is O2 times the pressure

1.5 / ( 1.5 + 1.2 + .301 )   * 1 atm = .4998 atm  

( 1) Are you sure it is   ONE atm pressure in the container?

(2) IS the first answer supposed to be   5 x 10^-1  atm    perhaps?

There are approximately \(2.76 * 10^{24\) ammonia molecules in the given sample.

To calculate the number of ammonia molecules in the sample, we need to use Avogadro's number and the molar mass of ammonia.

The molar mass of ammonia \((NH_3)\) can be calculated by adding up the atomic masses of nitrogen (N) and hydrogen (H):

Molar mass of \(NH_3\) = (1 x atomic mass of N) + (3 x atomic mass of H)

              = (1 x 14.01 g/mol) + (3 x 1.01 g/mol)

              = 14.01 g/mol + 3.03 g/mol

              = 17.04 g/mol

Now, we can calculate the number of moles of ammonia in the sample using the formula:

Number of moles = Mass of the sample / Molar mass

Number of moles = 78.25 g / 17.04 g/mol

              ≈ 4.5865 mol (rounded to four decimal places)

Finally, we can use Avogadro's number, which represents the number of particles (atoms, molecules, etc.) in one mole of a substance. Avogadro's number is approximately \(6.022 * 10^{23\) particles/mol.

Number of ammonia molecules = Number of moles x Avogadro's number

Number of ammonia molecules ≈ 4.5865 mol x (\(6.022 * 10^{23\) molecules/mol)

                           ≈ \(2.76 * 10^{24\) molecules (rounded to two significant figures)

Therefore, the provided sample contains roughly \(2.76 * 10^{24\) ammonia molecules.

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The number of ammonia molecules in the sample is approximately 2.764 x \(10^{24}\) molecules.

To calculate the number of ammonia molecules in a given sample, we need to use Avogadro's number and the molar mass of ammonia.

The molar mass of ammonia (NH3) is calculated as follows:

Molar mass of N = 14.01 g/mol

Molar mass of H = 1.01 g/mol

Total molar mass of NH3 = 14.01 g/mol + (3 * 1.01 g/mol) = 17.03 g/mol

Now, we can calculate the number of moles of ammonia in the sample:

Number of moles = Mass of sample / Molar mass of NH3

Number of moles = 78.25 g / 17.03 g/mol = 4.594 moles

Next, we use Avogadro's number, which states that there are 6.022 x \(10^{23}\) molecules in one mole of a substance.

Number of molecules = Number of moles * Avogadro's number

Number of molecules = 4.594 moles * 6.022 x \(10^{23}\) molecules/mol = 2.764 x \(10^{24}\) molecules

Therefore, there are approximately 2.764 x \(10^{24}\) ammonia molecules in the given sample of 78.25 g.

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The ph value of human saliva is between 6.2-7.6 with 6.7 being the average pH

ph value of human saliva is 7 and 6

Answer:

moles reactant = 2, moles of products = 3

Explanation:

The reactants are on the left side of the equation. Although, energy (heat) is a reactant it will not factor into the calculation for moles. The coefficient is the number of moles for each substances. So for the reactant side NO would have 2 moles because the coefficient is 2. Using the same logic, NO on the product side will have 2 moles and O2 will be 1 mole. O2 has one mole because it is implied that you know anything multipled by one is the same number. So 1 mole of O2 is written as O2 and not 1 O2.

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The result will be 32 and 4 multiplied by the number.

Let us assume that the unknown number is x.

The sum of the number and 8 will give us: x + 8.

Now, the sum above is multiplied by 4. The equation becomes:

  4(x + 8).

If the equation is expanded further, then it becomes:

4x + 32.

Thus, 4 multiplied by the sum of a number and 8 will result in the sum of 32 and 4 multiplied by the number.

Let us now assume that the number is 2:

4*2 + 32 = 40.

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Answer:

39.99g/mol

Explanation:

Na = 22

O= 16

H = 1

= 40g or 39.99g/mol

Answer: 39.99g/mol

Explanation:

right

The strong bases in the given list are \(Sr(OH)2\), \(Ba(OH)2\), \(KOH\), \(NaOH\), \(Ca(OH)2\), and \(LiOH\). These bases completely dissociate in water and have a strong tendency to accept protons, making them strong bases.

"\(NH3\), \(Sr(OH)2\), \(Ba(OH)2\), \(KOH\), \(NaOH\), \(Ca(OH)2\), \(Mg(OH)2\), \(Cu(OH)2\), and \(LiOH\),"  the strong bases include \(Sr(OH)2\), \(Ba(OH)2\), \(Ca(OH)2\), and \(Mg(OH)2\).

Strong bases are defined as bases that completely ionize in aqueous solution to form hydroxide ions. The strength of a base is determined by its ability to donate \(OH-\) ions in solution.

The strong bases in the list provided include those that have high solubility and completely dissociate in water.

These strong bases include \(Sr(OH)2\), \(Ba(OH)2\), \(Ca(OH)2\), and \(Mg(OH)2\). The other bases listed are also bases, but they are not considered strong bases.

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Answer:b

Explanation:i just did it

Answer:

\(Q=210.8kJ\)

Explanation:

Hello!

In this case, since the heat of vaporization is related with the energy required by a substance to undergo the phase transition from liquid to gas, we can compute such amount of energy as shown below:

\(Q=m\Delta H_{vap}\)

In such a way, since the enthalpy of vaporization is given as well as the mass, we compute the energy as shown below:

\(Q=155g*1360J/g\\\\Q=210.8kJ\)

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Answer:

The southern hemisphere is currently experiencing "Summer"

Explanation:

The Southern hemisphere is experiencing summer because it is closer to the sun than the Northern Hemisphere and also, direct light is more hotter than indirect light.

So, first, let's try an EXPERIMENT!

Take a VERY bright flashlight or a very small laser that can't harm you or just burn a paper in 1 second.

Then, take a piece of paper, or maybe just your skin, (like your hand) and place it under the light or laser, (for the laser, you should probably take the paper), and place the light source right above your skin, then, after some time, when it gets hot, measure the temperature. (around like 30 seconds later),

Note down the temperature...

Now, do the same thing, accept, do it in a very weird angle, face it towards your paper or hand, but, do it in an angle. More than like 30 degrees. Then, after some time, note down the temperature.

You probably, noticed, that the direct light (the one with the straight light facing your paper or skin, was hotter). Look at the image below, and you can understand better.

So, the same thing applies to the earth. The southern hemisphere in this picture is facing more directly to the sun than the northern hemisphere. That is why your answer is

Thank you! Please mark me Brianliest!

Remember to have fun, and a nice day!

Answer:   summer

Explanation:

Answer: Ultraviolet Light

Explanation:

Very hot and massive stars actually emit most of their light in the ultraviolet range, making this the perfect wavelength for studying them

Answer:

The amount of heat that must be removed from steam at 100 degrees Celsius to get ice at -273 degrees Celsius can be calculated using the formula for the heat of fusion of water. The heat of fusion of water is approximately 333.55 joules per gram, which means that it takes 333.55 joules of energy to convert 1 gram of liquid water at 0 degrees Celsius to 1 gram of ice at 0 degrees Celsius.

To convert 0.000010 kg of steam at 100 degrees Celsius to ice at -273 degrees Celsius, we must first convert the steam to liquid water at 100 degrees Celsius, which requires the addition of heat. The heat required to do this can be calculated using the specific heat capacity of water, which is approximately 4.186 joules per gram per degree Celsius. The specific heat capacity tells us how much heat is required to raise the temperature of 1 gram of a substance by 1 degree Celsius.

To convert 0.000010 kg of steam at 100 degrees Celsius to liquid water at 100 degrees Celsius, we would need to add (0.000010 kg) * (100 degrees Celsius) * (4.186 joules/gram/degree Celsius) = 0.004186 joules of heat.

Once the steam has been converted to liquid water, we can then convert the water to ice at -273 degrees Celsius. To do this, we would need to remove (0.000010 kg) * (333.55 joules/gram) = 0.033355 joules of heat.

In total, we would need to remove 0.004186 joules + 0.033355 joules = 0.037541 joules of heat from 0.000010 kg of steam at 100 degrees Celsius to get ice at -273 degrees Celsius.

Explanation:

Answer:

\(189kJ\)

Explanation:

Hello!

In this case, since one mole of ethanol release 8,842 J per 1 mole of ethanol, we can write:

\(\frac{8,842J}{1molC_2H_6H}\)

Thus, since we need the energy released by 982.6 g of ethanol, we compute the moles in such mass of fuel:

\(n=982.6g\frac{1mol}{46.08g} =21.3mol\)

Therefore, the result is:

\(\frac{8,842J}{1mol}*21.3mol=188,545J\)

Which in kJ is:

\(189kJ\)

Best regards!

Answer: fish

Explanation: they are living organisms; they live in water