A compound has an empirical formula of
CH20. What is its molecular formula, if its
molar mass is 180 g/mol?
(C=12.01 amu, H=1.008 amu, O=16.00 amu)

No. of oxygen atoms = 2 × 0.011361 × 6.02 x 10^23= 3.01 x 10^23Therefore, there are approximately 3.01 x 10^23 oxygen atoms in 0.5 mol of CO2. There are approximately 3.01 x 10^23 oxygen atoms in 0.5 mol of CO2.

The given chemical compound is CO2.Let's count the number of oxygen atoms in 0.5 mol of CO2.We know that 1 mol of CO2 contains 2 oxygen atoms and 1 carbon atom.Atomic mass of O = 15.9994 g/molAtomic mass of C = 12.0107 g/molSo, molecular mass of CO2 = (2 × atomic mass of O) + atomic mass of C= 2(15.9994) + 12.0107= 32.00 + 12.0107= 44.0107 g/molNumber of moles = Given mass/Molar mass= 0.5/44.0107= 0.011361 molsNo. of oxygen atoms = 2 × 0.011361 × 6.02 x 10^23= 3.01 x 10^23.

The given chemical compound is CO2. To count the number of oxygen atoms in 0.5 mol of CO2, we will follow the following steps:Step 1: Find molecular mass of CO2. Molecular mass is the sum of atomic masses of all atoms in a molecule.Molecular mass of CO2 = (2 × atomic mass of O) + atomic mass of C= 2(15.9994) + 12.0107= 32.00 + 12.0107= 44.0107 g/molStep 2: Calculate number of moles. We will use the formula: Number of moles = Given mass/Molar massNumber of moles = 0.5/44.0107= 0.011361 molsStep 3: Find the number of oxygen atoms in 0.5 mol of CO2.1 mol of CO2 contains 2 oxygen atoms and 1 carbon atom.No. of oxygen atoms = 2 × 0.011361 × 6.02 x 10^23= 3.01 x 10^23Therefore, there are approximately 3.01 x 10^23 oxygen atoms in 0.5 mol of CO2.

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Answer:

136 g Al₂O₃

Explanation:

Assuming you do not need to find the limiting reactant, to find the mass of Al₂O₃, you need to (1) convert grams O₂ to moles O₂ (via molar mass), then (2) convert moles O₂ to moles Al₂O₃ (via mole-to-mole ratio from equation coefficients), and then (3) convert moles Al₂O₃ to grams Al₂O₃ (via molar mass). It is important to arrange the conversions in a way that allows for the cancellation of units. The final answer should have 3 sig figs to match the sig figs of the given value (64.0 g).

Molar Mass (O₂): 32 g/mol

Molar Mass (Al₂O₃): 102 g/mol

4 Al + 3 O₂ -----> 2 Al₂O₃

64.0 g O₂           1 mole           2 moles Al₂O₃            102 g
-----------------  x  --------------  x  ------------------------  x   -------------  =  136 g Al₂O₃
                             32 g               3 moles O₂             1 mole

Answer:

Explanation:

Based of the fact that you were given 2 masses I would assume this to be a limiting reagent question. However amount on the left side both equal 2. Ignoring limiting reagents and focusing on just O2 the steps would be:

1. Make sure the equation is balanced ( already given)

2- Use given values to find the mols of O2 (mass/molar mass)

3. Mols are conserved but due to the coefficients the molar value from O2 must be divided by three and multiplied by 2 to ensure proper ratios

4. Using that amount the mass can derived using amount/molar mass

5. Use proper significant digits and units(3 in this case)

They would be attracted with the uncharged object.

It occurs because of the electric field of negative and positive charges . The negative attracts positive ions of the uncharged object and the positive does the opposite one. Therefore, they attract with the uncharged object.

Answer: The charged objects will attract the uncharged object

Pls brainliest

Answer:

covalent bonds

Explanation:

An excess of aldehyde is used in the aldol-dehydration reaction to ensure that the desired aldol product is formed. The excess aldehyde helps drive the reaction forward and increases the yield of the desired product.

In the aldol-dehydration reaction, an excess of aldehyde is used for several reasons. Firstly, the excess aldehyde helps to shift the equilibrium towards the formation of the desired aldol product. Since the aldol product is formed by the condensation of two aldehyde molecules, having an excess of aldehyde increases the chances of successful condensation reactions and improves the yield. Secondly, the excess aldehyde helps to compensate for any side reactions or losses during the reaction. Some aldehyde molecules may undergo undesired reactions or be consumed in competing reactions, and the excess ensures sufficient reactant availability for the desired reaction. Overall, the excess of aldehyde promotes higher yields and increases the efficiency of the aldol-dehydration reaction.

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A neutralization reaction between an acid and a metal hydroxide typically produces water and a salt. So, the answer to your question is b.

The formation of hydrogen gas or oxygen gas is not a common outcome of neutralization reactions, and sodium hydroxide is not a product of neutralization between an acid and a metal hydroxide.
                                        The products of a neutralization reaction between an acid and a metal hydroxide. A neutralization reaction between an acid and a metal hydroxide produces water and a salt (Option b). This is because the hydrogen ion (H+) from the acid reacts with the hydroxide ion (OH-) from the metal hydroxide to form water (H2O), while the remaining cation from the metal hydroxide and the anion from the acid combine to form a salt.

                                     Therefore, option b is the most appropriate answer to your question. It is essential to note that the type of salt produced depends on the acid and the metal hydroxide used in the reaction.

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The statements about diels alder reaction which are true are given in the explanation part.

The following statements about the Diels-Alder reaction are true:

- True: It is a reaction involving pi-electrons.
- True: It is a concerted reaction, meaning that it occurs in a single step without the formation of reaction intermediates.
- False: It is not necessarily favored by entropy considerations, as the reaction can be endothermic and enthalpy-driven.
- True: It is a [4+2] cycloaddition, meaning that it involves the formation of a 6-membered ring from a 4-carbon diene and a 2-carbon dienophile.
- False: While some Diels-Alder reactions can be thermal, others require specific conditions such as high pressure or the use of a catalyst to occur.
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Answer:

i think kinetic energy sorry if I'm wrong.

The automobile gasoline can hold 22.3 lb. of gasoline if the gasoline has a density of 0. 737 g/ml.

The automobile gasoline tank holds 22.3 pounds of gasoline when full. To calculate the amount of gasoline that a tank can hold, we need to convert the volume in gallons to volume in liters and then multiply it by the density in g/mL to find the mass in grams.

The density of gasoline is 0.737 g/mL, which means that every milliliter of gasoline weighs 0.737 grams. To convert the volume from gallons to liters, we use the conversion factor 1 gallon = 3.785 liters.

So, the volume of the tank in liters is

Multiplying this volume by the density of gasoline gives us the mass of gasoline in grams:

To convert this mass to pounds, we multiply by the conversion factor 2.2046 lb/kg, giving us a total of

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The mass of water needed to absorb 456 J is 1.44 g

We'll begin by calculating the change in the temperature of the water.

Initial temperature of water (T₁) = 22.7 °C

Final temperature (T₂) = 98.3 °C

ΔT = T₂ – T₁

ΔT = 98.3 – 22.7

Heat absorbed (Q) = 456 J

Change in temperature (ΔT) = 75.6 °C

Specific heat capacity of water (C) = 4.184 J/gºC

Q = MCΔT

456 = M × 4.184 × 75.6

456 = M × 316.3104

Divide both side by 316.3104

M = 456 / 316.3104

Therefore, the mass of the water is 1.44 g

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Answer:

C (top to bottom) or the 3rd one

Explanation:

Since this is a single replacement reaction, the equation for the reaction is:

\(\text{Mg}+\text{H}_{2}\text{SO}_{4} \longrightarrow \text{MgSO}_{4}+\text{H}_{2}\)

From this, we know that for every mole of magnesium consumed, 1 mole of hydrogen is produced.

The atomic mass of magnesium is 24.305 g/mol, so 72 grams of magnesium is 72/24.305 = 2.9623534252211 moles.

This means we need to find the mass of 2.9623534252211 moles of hydrogen.

Hydrogen has an atomic mass of 1.00794 g/mol, so doubling this to get the formula mass of of \(\text{H}_{2}\), we get 2.01588 g/mol, which his a mass of:

(2.01588)(2.9623534252211). which is about 5.97 g

Melting points of enantiomers will not compare to each other as they have same M.P. and Diastereoisomers are compared on the basis of melting point.

Stereoisomers are those isomers which are having the same molecular formula but different spatial arrangemet of atoms within the molecule.

Hence, only diastereoisomers are compared on the basis of melting point.

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true

Explanation:

Atoms cannot be subdivided, created, or destroyed. Atoms of different elements can combine in simple whole number ratios to form chemical compounds.

Answer:

true

hdozhsienzidbxirbfifndirhfirbr

As a gas condenses to a liquid, the potential energy decreases.

When a substance transitions from the gaseous phase to the liquid phase, the intermolecular forces of attraction become stronger. These forces, such as London dispersion forces, dipole-dipole interactions, or hydrogen bonding, start to dominate as the gas molecules come closer together. In the gaseous state, the molecules have higher kinetic energy and are moving more freely, with greater distances between them. As the gas condenses and transitions into a liquid, the molecules become more closely packed and their motion becomes restricted. The intermolecular forces pull the molecules together, allowing them to form stable arrangements. As the gas molecules move closer and the intermolecular forces become stronger, the potential energy of the system decreases. The potential energy decreases because the molecules are moving from positions of higher potential energy (with weaker intermolecular forces) to positions of lower potential energy (with stronger intermolecular forces). Therefore, during the process of condensation, the potential energy of the system decreases as the gas transitions into a liquid.

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Answer:

si

Explanation:

Answer and work pictured below:

Answer:

High temperature increases the number of high energy collisions

Explanation:

Increasing the temperature a reaction takes place at increases the rate of reaction. At higher temperatures, particles can collide more often and with more energy, which makes the reaction take place more quickly.

Answer:

Explanation:

Here, we want to get the change in the internal energy of the system

Mathematically, according to the 1st law of thermodynamics, we have it that:

where:

Q = 2,500 J

W = +7,655 J

W is positive since work is done by the system

Substituting the values into the equation above, we have it that:

Answer:

the ability for a given substance, the solute to dissolve in a solvent is solubility.

Answer:

the ability for a given substance, the solute to dissolve in a solvent is solubility.

The phase transition which occurs when a substance increases temperature at constant pressure is solid to liquid. The correct option is A.

It can be seen in the attached diagram that when the substance is at 120 degrees C and 925 mmHg, it is in the solid phase. Then, if we increase the temperature while keeping the pressure as constant, it will change to the liquid phase.

The lines represent the combinations of pressures and temperatures where two phases can exist in equilibrium. In another words, these lines show phase change points. The line divides the solid and gas phases, defines sublimation (solid to gas) and deposition (gas to solid).

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Although part of your question is missing, you might be referring to this full question: Consider the phase diagram shown here. A sample of the substance in the phase diagram is initially at 120 degrees C and 925 mmHg. What phase transition occurs when a substance increases temperature at constant pressure?

a) solid to liquid

b) liquid to gas

c) solid to gas

d) liquid to solid

Let's see that the STP represents the conditions for the temperature of 0°C (273 K) and for the pressure of 1 atm.

We have this initial data and a volume of 3.20 x 10 ^(2) mL. To solve this problem, we need to use the ideal gas formula:

where T is temperature, P is pressure, and V volume. Subindex 1 is the initial data and subindex 2 is the final data.

We want to find the final volume, so clearing for V2 in the formula, we're going to obtain:

And the final step is replacing the data that we have, where the final data is 425.0 K and 3.50 atm (remember that the volume must be in liters, 1 liter is 1000 mL, so 3.20 x 10^2 mL is 0.32 L):

The answer is that the new volume of the sample of helium would be 0.14 L.

Answer:

I found this!

Electrochemical methods depend upon electrochemical cells because they involve the conversion of chemical energy into electrical energy, or vice versa. An electrochemical cell consists of two electrodes, one of which is the anode and the other is the cathode, which are separated by an electrolyte. The anode and cathode are connected by an external circuit, allowing electrical current to flow through the cell.

In an electrochemical method, a chemical reaction occurs at the electrodes, and the electrons involved in that reaction flow through the external circuit. This flow of electrons generates an electrical current, which can be measured and used to determine the amount of a substance present in a sample. Additionally, by applying an external voltage to the cell, chemical reactions can be forced to occur, and this is the basis of electro-synthesis, the production of chemical compounds.

In summary, electrochemical methods rely on the use of electrochemical cells because they allow for the conversion of chemical energy into electrical energy, and this electrical energy can be measured and used to determine the amount of a substance present in a sample or to generate chemical compounds.

Explanation:

Electrochemical methods depend upon electrochemical cells because they involve the conversion of chemical energy into electrical energy, or vice versa.

An electrochemical cell consists of two electrodes, one of which is the anode and the other is the cathode, which are separated by an electrolyte. The anode and cathode are connected by an external circuit, allowing electrical current to flow through the cell.

In an electrochemical method, a chemical reaction occurs at the electrodes, and the electrons involved in that reaction flow through the external circuit. This flow of electrons generates an electrical current, which can be measured and used to determine the amount of a substance present in a sample.

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Answer:

To identify a pure liquid substance using the physical properties of solubility, density, and boiling point. The physical properties of a pure substance can be measured without changing the composition of the substance.

Explanation:

Answer:

Convection currents are caused by the movement of the magma in the mantle.

Explanation:

The pH of coffee is less acidic than the pH of stomach acid. The pH scale ranges from 0 to 14, with lower numbers indicating more acidity and higher numbers indicating more alkalinity or basicity. A pH of 5.0 for coffee is mildly acidic, while a pH of 2.0 for stomach acid is highly acidic.

The answer choices provided are not accurate comparisons between the pH of coffee and stomach acid. Option A is incorrect because the pH difference between coffee and stomach acid is actually three pH units, not three times more acidic. Option B is incorrect because both coffee and stomach acid are acidic substances. Option C and D are incorrect because they refer to the concentration of hydrogen ions (H+) and hydroxide ions (OH-) respectively, which cannot be determined based on pH alone. Option E is the closest comparison to the correct answer, but the actual pH difference between coffee and stomach acid is 1,000 times, not 10,000 times. E. Stomach acid is 1,000 times more acidic than coffee.

The pH scale ranges from 0 to 14, with 7 being neutral. A pH value below 7 indicates acidity, and a value above 7 indicates basicity. Coffee has a pH of 5.0, making it acidic, and stomach acid has a pH of 2.0, making it even more acidic. The pH scale is logarithmic, meaning that a difference of one pH unit corresponds to a tenfold difference in hydrogen ion (H+) concentration. Since there is a difference of 3 pH units between coffee and stomach acid (5.0 - 2.0 = 3), the stomach acid is 10^3, or 1,000, times more acidic than coffee.

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The conditions for a standard electrochemical cell. select one or more : pressure of 1 atm temperature of 298 k solution concentrations of 1 M.

The electrochemical cell is the cell that is capable of generating the electrical energy from the chemical reactions or by the use of the electrical energy to cause the chemical reaction. The conditions for a standard electrochemical cell. select one or more : pressure of 1 atm temperature of 298 k solution concentrations of 1 M.  

There are the two types of the electrochemical cells is as follows : the galvanic called the electrolytic cells. the galvanic cell is also called as the voltaic cell.

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The 85th percentile of blood pressure readings is approximately 137.64. a. To calculate the z-score for a blood pressure reading of 140, we can use the formula:

z = (x - μ) / σ

where x is the value (140 in this case), μ is the mean (121), and σ is the standard deviation (16).

Substituting the values into the formula:

z = (140 - 121) / 16

z ≈ 1.19 (rounded to two decimal places)

b. To find the proportion of Canadians with high blood pressure, we need to calculate the area under the normal distribution curve for values above 140. This can be done by finding the cumulative probability using the z-score.

Using a standard normal distribution table or a calculator, we can find that the cumulative probability corresponding to a z-score of 1.19 is approximately 0.881.

Therefore, the proportion of Canadians with high blood pressure is approximately 0.881 (rounded to four decimal places).

c. To find the proportion of Canadians with systolic blood pressure in the range from 100 to 140, we need to calculate the area under the normal distribution curve between these two values.

Using the z-scores corresponding to 100 and 140, we can find the cumulative probabilities for each value. The cumulative probability for a z-score of -1.25 (corresponding to 100) is approximately 0.105, and the cumulative probability for a z-score of 1.19 (corresponding to 140) is approximately 0.881 (as calculated in part b).

The proportion with systolic blood pressure between 100 and 140 is the difference between these two probabilities:

Proportion = 0.881 - 0.105 ≈ 0.776 (rounded to four decimal places)

d. The 85th percentile represents the value below which 85% of the blood pressure readings fall. To find the 85th percentile, we need to determine the z-score that corresponds to an area of 0.85 under the normal distribution curve.

Using a standard normal distribution table or a calculator, we can find that the z-score corresponding to an area of 0.85 is approximately 1.04.

To find the actual blood pressure reading at the 85th percentile, we can use the z-score formula:

x = μ + (z * σ)

Substituting the values:

x = 121 + (1.04 * 16)

x ≈ 137.64

Therefore, the 85th percentile of blood pressure readings is approximately 137.64.

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