How many aluminum atoms are in 2.56 g of aluminum?
Express your answer to three significant figures.

Answer:

La temperatura final del sistema es 1029,346 °C.

Explanation:

Asumamos que el sistema conformado por el cobre y el estaño no tiene interacciones con sus alrededores. Por la Primera Ley de la Termodinámica, el cobre cede calor al estaño con tal de alcanzar el equilibrio térmico. El cobre se encuentra inicialmente en su punto de fusión, mientras que el estaño está por encima de ese punto, de modo que la transferencia de calor es esencialmente sensible:

\(m_{Cu}\cdot c_{Cu}\cdot (T-T_{Cu}) = m_{Sn}\cdot c_{Sn}\cdot (T_{Sn}-T)\)

\((m_{Cu}\cdot c_{Cu} + m_{Sn}\cdot c_{Sn})\cdot T = m_{Sn}\cdot c_{Sn}\cdot T_{Sn} + m_{Cu}\cdot c_{Cu}\cdot T_{Cu}\)

\(T = \frac{m_{Sn}\cdot c_{Sn}\cdot T_{Sn}+m_{Cu}\cdot c_{Cu}\cdot T_{Cu}}{m_{Cu}\cdot c_{Cu}+m_{Sn}\cdot c_{Sn}}\) (1)

Donde:

\(m_{Sn}\) - Masa del estaño, en gramos.

\(m_{Cu}\) - Masa del cobre, en gramos.

\(c_{Sn}\) - Calor específico del estaño, en calorías por gramo-grados Celsius.

\(c_{Cu}\) - Calor específico del cobre, en calorías por gramo-grados Celsius.

\(T_{Sn}\) - Temperatura inicial del estaño, en grados Celsius.

\(T_{Cu}\) - Temperatura inicial del cobre, en grados Celsius.

Si sabemos que \(m_{Cu} = 150\,g\), \(m_{Sn} = 35\,g\), \(c_{Cu} = 0,093\,\frac{cal}{g\cdot ^{\circ}C}\), \(c_{Sn} = 0,060\,\frac{cal}{g\cdot ^{\circ}C}\), \(T_{Sn} = 560\,^{\circ}C\) y \(T_{Cu} = 1100\,^{\circ}C\), entonces la temperatura final del sistema es:

\(T = \frac{(35\,g)\cdot \left(0,060\,\frac{cal}{g\cdot ^{\circ}C} \right)\cdot (560\,^{\circ}C)+(150\,g)\cdot \left(0,093\,\frac{cal}{g\cdot ^{\circ}C} \right)\cdot (1100\,^{\circ}C)}{(35\,g)\cdot \left(0,060\,\frac{cal}{g\cdot ^{\circ}C} \right)+(150\,g)\cdot \left(0,093\,\frac{cal}{g\cdot ^{\circ}C} \right)}\)

\(T = 1029,346\,^{\circ}C\)

La temperatura final del sistema es 1029,346 °C.

Answer:

The concentration of the nitric acid (HNO3) solution is 72 M.

Explanation:

To determine the concentration of the nitric acid solution, we can use the concept of stoichiometry and the equation of the neutralization reaction between nitric acid (HNO3) and sodium hydroxide (NaOH):

HNO3 + NaOH → NaNO3 + H2O

The balanced equation shows that the molar ratio between HNO3 and NaOH is 1:1. This means that 1 mole of HNO3 reacts with 1 mole of NaOH.

Given:

Volume of HNO3 solution = 10.0 ml

Volume of NaOH solution = 3.6 ml

Molarity of NaOH solution = 0.2 M

To find the concentration of the HNO3 solution, we need to calculate the number of moles of NaOH used in the neutralization reaction:

moles of NaOH = volume of NaOH solution * molarity of NaOH solution

= 3.6 ml * 0.2 M

= 0.72 mmol (millimoles)

Since the molar ratio between HNO3 and NaOH is 1:1, the number of moles of HNO3 in the solution is also 0.72 mmol.

Now, we can calculate the concentration of the HNO3 solution using the formula:

concentration (in M) = moles of solute / volume of solution (in L)

concentration = 0.72 mmol / 0.010 L

= 72 mmol/L

= 72 M

Therefore, the concentration of the nitric acid (HNO3) solution is 72 M.

The question is incomplete, the complete question is;

Solid phosphorus and chlorine gas react to form solid phosphorus pentachloride. Suppose you have 9.0 mol of P and 2.0 of Cl2 in a reactor. Calculate the largest amount of PCl5 that could be produced. Round your answer to the nearest 0.1 mol.

Answer:

0.8 mols

Explanation:

The equation of the reaction is:

P4(s)+10Cl2(g)→4PCl5(g)

We have to determine the limiting reactant by considering the reactant that yields the least number of moles of product.

1 mole of P yields 4 moles of PCl5

then 9.0 moles of P yields 9.0 * 4/ 1 = 36 moles of PCl5

Secondly;

10 moles of chlorine gas yields 4 moles of PCl5

2 moles of chlorine gas yields 2 *4/10 = 0.8 moles of PCl5

Since chlorine gas is the limiting reactant, the largest amount of PCl5 that can be produced in the reactor is 0.8 mols

The largest amount of PCl₅ that can be produced from the reaction is 0.8 mole

We'll begin by determining the limiting reactant.

P₄ + 10Cl₂ —> 4PCl₅

1 : 10

9 : 2

From the above, Cl₂ is the limiting reactant as little amount is available for the reaction.

From the balanced equation above,

10 moles of Cl₂ reacted to produce 4 moles of PCl₅.

Therefore,

2 moles of Cl₂ will react to produce = (2 × 4)/10 = 0.8 mole of PCl₅.

Thus, the largest amount of PCl₅ produced from the reaction is 0.8 mole

Compete Question

Solid phosphorus and chlorine gas react to form solid phosphorus pentachloride. Suppose you have 9.0 mol of P and 2.0 of Cl2 in a reactor. Calculate the largest amount of PCl5 that could be produced. Round your answer to the nearest 0.1 mol.

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Answer:

A Experiment is an operation or procedure carried out under controlled conditions in order to discover an unknown effect or law, to test or establish a hypothesis, or to illustrate a known law

Explanation:

Brainliest pls

Answer:When a single compound breaks down into two or more compounds or elements in a chemical reaction then it is known as decomposition reaction.

The chemical symbol for sodium carbonate is .

The decomposition of sodium carbonate is:

The decomposition of sodium bicarbonate,  will result in the formation of sodium oxide,  and carbon dioxide, .

Hence, carbon dioxide,  will produce with sodium oxide,  on decomposition of .

Explanation:Na2CO3 Na2O +CO2   CO2 is the answer

Answer:

To find the molarity of a 5% vinegar solution, you first need to determine the mass of acetic acid in the solution. To do this, you can multiply the mass of the solution by the mass fraction of acetic acid.

The mass fraction of acetic acid in a 5% vinegar solution is 5%, or 0.05. The mass of the solution is the density of the solution multiplied by the volume of the solution. Since the density of the solution is 1.01 g/mL, you can use the following formula to calculate the mass of the solution:

Mass of solution = density * volume

Once you have the mass of the solution, you can use the following formula to calculate the mass of acetic acid in the solution:

Mass of acetic acid = mass of solution * mass fraction of acetic acid

Once you have the mass of acetic acid, you can use the molar mass of acetic acid to calculate the number of moles of acetic acid in the solution. Finally, you can use the volume of the solution to calculate the molarity of the solution using the following formula:

Molarity = number of moles / volume

I hope this helps! Let me know if you have any questions.

Answer: The reaction rate will DECREASE.

Explanation:

Chemical reaction occurs through the combination of chemical reactants to form new products. The rate if this reaction is affected by the following factors:

- the chemical nature of the reacting substances,

- the state of subdivision (one large lump versus many small particles) of the reactants,

- the temperature of the reactants,

- the concentration of the reactants, and

- the presence of a catalyst.

When additional liter of pure water is added to the reaction mixture, collision between reactant molecules is reduced The dilution causes the concentration of the reactants to reduce. This in turn affects the rate of chemical reactions as the decreased concentration of reactants leads to a decrease in the reaction rate.

Answer: A typical hydrogen fuel cell produces 0.5 V to 0.8 V per cell. To increase the voltage individual cells can be connected in series.

When you step on the scale, you might see a reading of 160 lbs, but in actuality, you might weigh 160.11111 pounds, that would be challenging to determine with a standard bathroom scale.

Describe scale.

 A fish's external body covering, specifically, consists of a tiny, flattened, stiff, and unmistakably delimited plate. B: A tiny, thin plate with mica scales that resemble the scales of a moth's wing.

A little weighing scale – what is it?

It is a compact weighing scale with an easy-to-read digital screen that is portable. It is a compact weighing scale with an easy-to-read computer indicator that is portable. It is a versatile scale that works well for weighing big goods in various locations.

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The balanced chemical equation for the reaction between X and water to form the hydroxide, XOH, and a gas can be represented as:

X + H2O → XOH + Gas

Note that the identity of the gas produced will depend on the specific identity of X. The equation should be balanced in terms of the number of atoms of each element on both sides of the equation

A balanced equation is a chemical equation in which the number of atoms of each element present in the reactants is equal to the number of atoms of that element present in the products.

This means that the law of conservation of mass is satisfied, which states that matter cannot be created or destroyed, only transformed from one form to another.

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Barnacles are sessile/non-moving arthropods that attach to boats/whales. Sessile means they don't move and are fixed to a place.

A barnacle is an arthropod that belongs to the subclass Cirripedia of the subphylum Crustacea and is thus connected to crabs and lobsters. Barnacles are only found in the sea and prefer shallow and tidal seas, usually in erosive environments.

They play a vital part in the food chain since they are filtering organisms. Barnacles are suspension feeders, devouring plankton and dissolved debris floating in seawater, and hence play an important role in water purification for other creatures.

Barnacles produce thick calcium plates that surround them entirely. A white cone comprised of six calcium plates surrounds the crustacean.  Four more slabs form a "door" that the barnacle may open and close according on the tide. When the tide goes out, the barnacle goes into hibernation to retain moisture.

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Answer:

boiling water

Explanation:

boiling water produces more severe burns

Answer:

it is soluble in water

Explanation:

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An average brightness was calculated for each length of graphite tested to get a better understanding of the relationship between the length of the graphite and the brightness of the line it produced.

Graphite has many uses in various industries. Some of its uses include: Pencils, Lubricants, Refractories, Batteries, Electrodes, Nuclear reactors, Aerospace industry.

By calculating the average, it is possible to see if there is a trend in the data and if longer or shorter lengths of graphite produce brighter or duller lines. This information can be useful in determining the best length of graphite to use for a particular task or project.

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3122.0 mL of gas are present at 120.0 °C.

The volume of a gas is the amount of three-dimensional space it occupies. The volume of a gas is directly proportional to the temperature if the pressure is held constant.The force exerted perpendicularly to an object's surface in relation to its area is known as pressure. The average kinetic energy of the molecules that make up a system is measured by temperature.This means that the volume at 120°C will be the same multiple of the volume at 27°C. To calculate the multiple, we divide the final temperature by the initial temperature:

\(\frac{120.0\°C}{27.0\°C} = 4.44\)

Therefore, the volume at 120°C will be 4.44 times the volume of 700.0 mL at 27°C.

Volume at 120°C = 4.44 x 700.0 mL = 3122.0 mL

Therefore ,The volume of gas at 120.0 °C is 3122.0mL

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Answer: 4.2

Explanation:

\(M_{A}V_{A}=M_{B}V_{B}\\(12)V_{A}=(250)(0.20)\\V_{A}=\frac{(250)(0.20)}{12}=\boxed{4.2}\)

Based on the mass of 1 mole of nitrogen atoms, 7.55 x 10²³ atoms of nitrogen have a mass of 17.56 grams.

The number of atoms in 1 mole of nitrogen = 6.02 * 10²³ atoms

The mass of 1 mole of atoms of nitrogen = 14 g

Hence, 6.02 * 10²³ atoms has a mass of 14.01 g

Mass of 7.55 x 10²³ atoms = 14.01 g/mol * 7.55 x 10²³ / 6.02 * 10²³

The mass of 7.55 x 10²³ = 17.56 g

So,7.55 x 10²³ atoms of nitrogen have a mass of 17.56 grams.

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The percentage error of the recorded temperature is 2.9%

Percentage error = (absolute error / actual measurement) × 100

The following data were obtaned from the question:

The percentage error of the recorded temperature can be obtained as follow:

Percentage error = (absolute error / actual measurement) × 100

Percentage error = (1 / 34) × 100

Percentage error = 2.9%

Thus, the perecentage error of the recorded temperature is 2.9%

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The  amount of heat required to melt the iceberg at 9.58 * 10¹⁸ kJ.

The heat required to melt a unit mass of ice is known as the latent heat of fusion.

The latent heat of fusion of ice of 1 kg= 334 kJ of heat

Mass of iceberg = 3.1 x 10¹³ m³ * 917 kg = 2.8427 * 10¹⁶ kg

Amount of heat required = 2.8427 * 10¹⁶ * 334 = 9.58 * 10¹⁸ kJ.

Therefore, the amount of heat required to melt the iceberg at 9.58 * 10¹⁸ kJ.

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The statement is correct. The photoelectric effect refers to the phenomenon where electrons are ejected from the surface of a material when it is exposed to light. The frequency of light striking an electron in a metal must be above the threshold frequency in order for the photoelectric effect to occur.

The statement is correct. The photoelectric effect refers to the phenomenon where electrons are ejected from the surface of a material when it is exposed to light. However, for the photoelectric effect to occur, the frequency of the incident light must be above a certain threshold frequency.

The threshold frequency is the minimum frequency of light required to dislodge electrons from the material. Below this threshold frequency, regardless of the intensity or duration of the light, no electrons will be emitted.

This behavior can be explained by the particle-like nature of light, where light is composed of discrete packets of energy called photons. The energy of a photon is directly proportional to its frequency. Only photons with energy greater than or equal to the binding energy of the electrons in the material can dislodge them.

Therefore, the frequency of light striking an electron in a metal must be above the threshold frequency in order for the photoelectric effect to occur.

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Answer:

Boiling point temperature of a compound is dependent on the intermolecular forces present and molecular size. The stronger the intermolecular force, the higher the boiling point temperature and vice versa.

The answer in increasing boiling temperature is as follows:

a) SiH4 < HCl < H2O;

(b) F2 < Cl2 < Br2;

(c) CH4 < C2H6 < C3H8;

(d) N2 < O2 < NO

The boiling point temperature of a compound should be based on the intermolecular forces present and molecular size. It shows the direct relationship.

a) SiH4 < HCl < H2O;

(b) F2 < Cl2 < Br2;

(c) CH4 < C2H6 < C3H8;

(d) N2 < O2 < NO

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Answer:

Compounds From Decaying Matter.

Explanation:

A long time ago, when these were compounds in the ground. They were under lots of pressure, and then they turned into coal/diamonds.

The student's method for preparing pure crystals of copper sulfate contains errors and does not produce the desired outcome.

Use copper oxide instead of calcium carbonate: The student should add copper oxide (CuO) to the hydrochloric acid instead of calcium carbonate. Copper oxide reacts with hydrochloric acid to form copper chloride, which can then be converted to copper sulfate through a subsequent reaction with sulfuric acid.

Add sulfuric acid to the copper chloride solution: After the copper chloride solution is formed, the student should add sulfuric acid to it. This reaction between copper chloride and sulfuric acid will yield copper sulfate and hydrochloric acid. The student should ensure that the correct stoichiometric ratio is maintained to maximize the yield of copper sulfate crystals.

Crystal formation: The student should allow the solution to cool slowly after the reaction with sulfuric acid. This promotes the formation of larger, well-defined copper sulfate crystals.

Filtration and drying: Once the crystals have formed, the student should filter the solution to separate the solid crystals from the remaining liquid. The filtered crystals should then be thoroughly dried to remove any remaining water, resulting in pure copper sulfate crystals.

By following these improvements, the student can obtain pure crystals of copper sulfate.

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The molarity of the solution is 0.00016 M

To determine the molarity of a solution, you need to know:

From the information you provided, the concentration of the solution is given in parts per million (ppm). To convert from ppm to molarity, you need to know:

The molecular weight of glucose is 180.16 g/mol. If the solvent is water, the density is about 1 g/mL. Here is the conversion calculation:

1 ppm = 1 mg/L = (1/180.16 g/mol) / (1 g/mL) = 5.55 x 10^-6 mol/L

So, the molarity of the solution is: 2.89 ppm * 5.55 x 10^-6 mol/L/ppm = 1.60 x 10^-4 mol/L = 0.00016 M

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Answer:

Explanation:

Before telling the answer remember some terminology

molarity=No. of moles of solute/Volume of the solution in liters

M=n/V

n=Mass of solute(w)/Molecular mass(M)

V=volume of solution(v)/1000

ppm =(parts per million)

ppm of solute=(mass of solute/mass of solution)*10^{6}

2.89gms of solute in 1000000 of solution

5.22gm of solute

5.22in 1000 gms in litre=5220g\(L^{-1}\)

2.89 gms are present in 2.59/5220=5.5363*\(10^{-4}\)

Hence the molarity of the solution is 5.5363*\(10^{-4}\)mol \(L^{-1}\)

To determine the volume of water, we need to account for the density of water, which changes with temperature. However, at 25.4°C, the density of water is close enough to 1 g/mL for practical purposes. Therefore, we can approximate the volume of water to be the same as its mass.

Given:

Mass of water = 19.5487 g

Volume of water = Mass of water

Therefore, the volume of water is approximately 19.5487 mL.

Answer: 4

Explanation: because the zero doesn't count

Answer:

\(\boxed {\boxed {\sf D. \ They \ allow \ eukaryotes \ to \ reproduce}}\)

Explanation:

Gametes are also called sex cells.

There are two types: the sperm (male) and egg (female). Gametes are haploid or contain half of the genetic information. When they unite and fertilize, they combine the two halves of the genome to create a diploid zygote that has one complete set of genetic information.

This process is known as sexual reproduction, the type of reproduction that eukaryotes (organism with cells containing a nucleus with DNA and membrane bound organelles) typically use.

So, based on the information we know above, the best answer choice is D. They allow eukaryotes to reproduce

Answer:

Positive charge if there are more protons than electrons. Negative charge if there are more electrons than protons. If there's the same amount of protons and electrons, it's a neutral charge.

Explanation:

All matter is made up of electrons and protons. Electrons have a negative charge, protons have a positive charge. A charge is a type of particle measurement, and it is determined based on the amount of protons or electrons in a certain thing. The charge is which one there are more of, and there’s no charge (neutral) if they’re balanced.  

The Arrhenius definition of an acid states that an acid ionizes or dissociates to from hydroxide ions in solution.

The definition of solutions was more given by the traditional scientist in smart solutions, which are natural solutions, like substances that - easy solutions, aqueous like bases.

In this case, Arrhenius definition of an acid states that an acid ionizes or dissociates to from hydroxide ions in solution.

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The Mass of water will be 4485 g

It is given that:

heat energy = 1500 kJ

heat capacity , c = 4.18 J/g °C

initial temperature = 20.0°C

boiling of water ,final temperature = 100 °C

Q = mcΔT

m = Q / (cΔT)

m = 1500 / ( 4.18 × ( 100 °C - 20 °C )

m = 1500 / 334.4

m = 4.485 kg = 4485 g

Therefore , 1500 kJ of energy were transferred to water at 20.0°C. Heat capacity (c) for liquid water is 4.18 J/g C. ​mass of water could be brought to the boiling point is 4485 g.

The question is incomplete the complete question is:

Suppose that 1500 kJ of energy were transferred to water at 20.0°C. What mass of water could be brought to the boiling point? Heat capacity (c) for liquid water is 4.18 J/g C​

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