A sample of aluminum foil contains 7.90 x 10^23 atoms. What is the mass of the foil?

Answer:

\(6.43x19^8mg\)

Explanation:

Hello,

In this case, this unit conversion is performed by knowing that 1 kg of mass contains 1000 g and 1 g contains 1000 mg, therefore, the result is:

\(643kg*\frac{1000g}{1kg} *\frac{1000mg}{1g}\\ \\=6.43x10^8mg\)

Regards.

The pOH of the 0.001 M NaOH solution is approximately 3.

To determine the pOH of a solution, we need to know the concentration of hydroxide ions (OH-) in the solution.

In the case of a 0.001 M NaOH solution, we can assume that all of the NaOH dissociates completely in water to form Na+ and OH- ions. Therefore, the concentration of hydroxide ions in the solution is also 0.001 M.

The pOH is calculated using the equation:

pOH = -log[OH-]

Substituting the concentration of hydroxide ions, we have:

pOH = -log(0.001)

Using a calculator, we can evaluate the logarithm:

pOH ≈ 3

Therefore, the pOH of the 0.001 M NaOH solution is approximately 3.

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Answer:

0.2moles

Explanation:

Given parameters:

 Number of molecules of H₂ = 1.8 x 10²³molecules

Unknown:

Number of moles of NH₃ = ?

Solution:

 The reaction equation is given as:

                 N₂  + 3H₂   →   2NH₃

   Let us solve from the known to the unknown specie;

 Since the number of molecules is 1.8 x 10²³molecules of H₂;

      6.02 x 10²³molecules will give 1 mole of a substance

      1.8 x 10²³molecules will produce  \(\frac{1.8 x 10^{23} }{6.02 x 10^{23} }\) mole of H₂

                                                               = 0.3moles of H₂

From the balanced chemical equation;

                 3 moles of H₂ produced 2 moles of NH₃

                 0.3 moles of H₂ will yield \(\frac{0.3 x 2}{3}\)   = 0.2moles

Answer:

parts per billion

Explanation:

I took the quiz

Answer:

parts per billion

Explanation:

edge 2021

Answer:

The Density Of Ar (g) At -11°C And 675 MmHg (R =0.08206 L·atm/mol·K, 1 Atm = 760mmHg).

Answer:

* Limiting reactant: K2PtCl4.

* \(m_{Pt(NH_3)_2Cl_2}=475kgPt(NH_3)_2Cl_2\)

Explanation:

Hello,

In this case, for the reaction:

\(K_2PtCl_4 +2NH_3 \rightarrow Pt(NH_3)_2Cl_2 +2KCl\)

By starting with 655.1 kg of K2PtCl4 (molar mass 415.1 g/mol) and 728 kg of NH3 (molar mass 17 g/mol) the limiting reactant is identified as the one yielding the smallest moles of cisplatin, thus, we proceed as follows:

\(n_{Pt(NH_3)_2Cl_2}^{by \ K_2PtCl_4}=655.1kg K_2PtCl_4*\frac{1kmol K_2PtCl_4}{415.1g K_2PtCl_4}*\frac{1molPt(NH_3)_2Cl_2}{1mol K_2PtCl_4} =1.578kmolPt(NH_3)_2Cl_2\\\\n_{Pt(NH_3)_2Cl_2}^{by \ NH_3}=728kgNH_3*\frac{1kmol NH_3}{17g NH_3}*\frac{1molPt(NH_3)_2Cl_2}{2molNH_3} =21.4kmolPt(NH_3)_2Cl_2\)

In such a way, we infer that the K2PtCl4 is the limiting reactant, therefore, the maximum amount of cis-plat (300 g/mol) produced is:

\(m_{Pt(NH_3)_2Cl_2 }=1.578kmolPt(NH_3)_2Cl_2*\frac{301gPt(NH_3)_2Cl_2}{1molPt(NH_3)_2Cl_2}\\ \\m_{Pt(NH_3)_2Cl_2}=475kgPt(NH_3)_2Cl_2\)

Best regards.

Answer:

C

Explanation:

Based on the synthesis reaction,the product of the given chemical equation is NaCuPO4 .

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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Answer:

118.776 mmHg

Explanation:

The equation of the reaction is;

C4H10(g) + 13/2 O2(g) ------> 4CO2(g) + 5H20(g)

Now the mole ratio  according to the balanced reaction equation is;

1 : 6.5 : 4 : 5

Hence, the total number of moles present = 1 + 6.5 + 4 + 5 = 16.5 moles

Mole fraction of water vapour = 5/16.5 = 0.303

We also know that;

Partial pressure= mole fraction * total pressure

Partial pressure of H20(g) = 0.303 *  392 mmHg = 118.776 mmHg

The pressure (in mmHg) of water vapor is 118.78 mmHg

Butane reacts with oxygen according to the following equation

2C₄H₁₀ + 13O₂ —> 8CO₂ + 10H₂O

Mole fraction = mole / total mole

Mole fraction of water = 10 / 33

Mole fraction of water = 0.303

Partial pressure = mole fraction × total pressure

Partial pressure of water = 0.303 × 392

Partial pressure of water = 118.78 mmHg

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Answer:

ΔE = q + w

here q = -136 kj

w = 146

so  ΔE = -136 + 146 = 10 kj

thus internal energy of system increases by 10 kj...

I hope this helps! :) I don't know if it's the right one

When a strong acid or base is added to water, the pH will change dramatically.

A strong acid is one that is completely dissociated or ionized in an aqueous solution. This means it gives off the greatest number of hydrogen ions or protons when placed in a solution. Examples of strong acid are HCl, HBr, H2SO4, HNO4. These acids when placed in water, produces greatest amount of hydrogen ions. The pH value changes drastically. Any that has very high concentration of hydrogen and ion is acidic.

Also when base is added to water, the pH of water will increase above 7 and become basic. The pH of water is 7, but when base is added to it increases above 7.

Base is any solution that is slippery to touch in water solution, changes color, react with acid to form salt and change red litmus paper to blue.

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(a) The solubility product expression for Ag2CO3 is:

Ksp = [Ag+]^2[CO3^2-]

(b) The solubility product expression for Hg2Cl2 is:

Ksp = [Hg2^2+][Cl^-]^2

Answer:

Balance chemical equation is

O2(g) + 2H2(g) --> 2H20(g)

a. 0.20 mol 02 --> 0.225mol H20

b. 0.30 mol H2 --> 2.7mol H20

Answer:

a) 0.4 moles

b) 0.3 moles

The maximum mass of sodium bromide that could be produced by the chemical reaction is 38.59 g.

The balanced chemical equation for the reaction between hydrobromic acid and sodium hydroxide is:

HBr (aq) + NaOH (s) → NaBr (aq) + H2O (l)

To determine the maximum mass of sodium bromide that could be produced, we need to first identify the limiting reactant. We can do this by calculating the number of moles of each reactant using their molar masses:

Molar mass of HBr = 80.91 g/mol

Molar mass of NaOH = 40.00 g/mol

Number of moles of HBr = 55.8 g ÷ 80.91 g/mol = 0.689 mol

Number of moles of NaOH = 15.0 g ÷ 40.00 g/mol = 0.375 mol

The stoichiometry of the balanced chemical equation tells us that one mole of HBr reacts with one mole of NaOH to produce one mole of NaBr. Therefore, the limiting reactant is NaOH, since it produces fewer moles of product (NaBr) than HBr.

The number of moles of NaBr produced from the reaction is equal to the number of moles of NaOH used, which is 0.375 mol.

Finally, we can calculate the maximum mass of NaBr that could be produced using its molar mass:

Molar mass of NaBr = 102.89 g/mol

Mass of NaBr = number of moles of NaBr × molar mass of NaBr

Mass of NaBr = 0.375 mol × 102.89 g/mol = 38.59 g

Therefore, the maximum mass of sodium bromide that could be produced by the chemical reaction is 38.59 g.

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Answer:

A crystal or crystalline solid is a solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions. The scientific study of crystals and crystal formation is known as crystallography.

Explanation:

Answer:

0.0258 mol Answer .......

Answer: The size of an atom is generally considered as the distance between the outer shell electrons and the nucleus, i.e., the atom's radius. The larger the atomic radius, the lesser the reactivity of an element. It is because when the electrons are away from the nucleus, there is less electron density on the atom.

Answer:

umm translate

Explanation:

Answer:

you need to state the options

To determine the tomato's velocity when it hits the ground, we need more information. Specifically, we need the height from which the tomato was dropped and the tomato mass.

Without these details, it is impossible to calculate velocity accurately. The velocity of an object when it hits the ground depends on factors such as the height of the fall, the mass of the object, and any forces acting on it during the fall (such as air resistance).

If you can provide the necessary information, I can help you calculate the velocity of the tomato when it hits the ground.

The volume of 12 gas forms when 21 L Cl2 react at STP is 21 L.

To determine the volume of 12 gas (I assume you mean I2 gas) formed when 21 L of Cl2 reacts at STP (standard temperature and pressure), we need to use the ideal gas law equation.

The ideal gas law equation is given by:

PV = nRT

Where:

P = pressure

V = volume

n = number of moles

R = ideal gas constant

T = temperature

At STP, the pressure is 1 atm, and the temperature is 273.15 K.

From the balanced equation, we can see that the molar ratio between Cl2 and I2 is 1:1. So, if 21 L of Cl2 reacts, it will produce an equal volume of I2 gas.

Given that the volume of Cl2 is 21 L, we can assume the volume of I2 gas formed will also be 21 L.

Therefore, the volume of I2 gas formed is 21 L.

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The oil from cars is gotten from crude oil.

The car is an automobile that is mainly used for transportation purposes. It is made up of both electrical and mechanical parts.

The mechanical part of the car is driven by the engine which is the heart of the car.

The engine is made up of adjacent moving parts that need to be frequently lubricated through the engine oil.

The engine oil is gotten from crude oil, which is a mixture of hydrocarbons  that exist in liquid phase in natural underground reservoirs.

Therefore, the oil from cars is gotten from crude oil.

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Based on our knowledge of strong and weak acids, we can confirm that the Ka value for acetic acid will be relatively low since it is a weak acid.

Acids can be strong or weak. This is determined by its tendency to break apart into ions or stay together to form molecules. Although somewhat counter-intuitive, strong acids are those that are most likely to break apart and therefore contain a high number of ions within their solutions.

Weak acids, on the other hand, are those that tend to stay together in the form of molecules and therefore possess very low ion counts in their solutions. The acid dissociation constant, Kₐ, is used to measure whether an acid is weak or strong and how much so. In the case of Acetic acid, the ka measurement will offer a low value, indicating a weak acid.

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Answer:

All of them are organic compounds which have carbon as their main atom in the structure.

Explanation:

Hello.

In this case, since organic chemistry is the study of all the compounds having the carbon atom as their main atom, all the vegetables, animals, an in general, living things are composed by lipids, proteins, and other organic substances with this feature. Moreover, wood-based materials are mainly composed by lignin which is an organic polymer also having carbon as the main atom. In addition, oil and gasoline are organic chemical compounds with a lot of applications in daily life which also contain carbon atoms in their structure.

In such a way, a celery, a wooden spoon, and oil/gasoline have the carbon atom in common as their main atom in their chemical structures.

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Homogeneous mixture are Brass, Vodka and Sugar; while Heterogeneous mixture are Gravel and Potato salad.

A homogeneous mixture is a type of mixture where the composition is uniform and the same throughout. Examples of homogeneous mixtures include saltwater, air, and vinegar. These mixtures have a consistent appearance and properties, and their individual components cannot be easily separated.

A heterogeneous mixture is a mixture where the composition is not uniform and can vary in different parts of the mixture. Examples of heterogeneous mixtures include salad, fruit punch, and soil. These mixtures have varying appearance and properties, and their individual components can be easily separated.

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Answer:

C.C

Explanation:

Just took the test

A transverse wave is a motion in which all points on a wave oscillate along paths at right angles. Hence, option C is correct.

The wavelength is the horizontal distance between two adjacent crests or troughs.

The longest distance a particle goes from rest is to the peak of a crest or the bottom of a trough in a transverse wave. The amplitude of a transverse wave is this distance.

Hence, option C is correct.

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The molality of the solution is 0.0256 m.

The mole fraction of glycerol is  0.00046

The percent by mass concentration of glycerol is 0.23%

The ppm concentration is 2300 ppm

Molality is a measure of the concentration of a solute in a solution. It is defined as the number of moles of solute per kilogram of solvent.

The formula for molality is:

molality = moles of solute / mass of solvent in kilograms

1) Density of water = mass/volume

Mass of water = Density * volume of water

Mass =\(0.9982 g/mL * 998.9 mL\)

Mass =0.997 Kg of water

Number of moles of the glycerol =  \(2.550* 10^-2 M * 1 L\)

= \(2.550*10^-2\) moles

Molality of the solution = \(2.550*10^-2\)  moles/0.997 Kg

= 0.0256 m

Number of moles of water = 998.9/18 g/mol

= 55.5 mole

Mole fraction of glycerol = \(2.550*10^-2\) /\(2.550*10^-2\)  + 55.5

= 0.00046

By percent by mass;

2.3/1001.2 * 100/1

= 0.23%

Mass of glycerol = 2.3 g

Volume of solution = 1 L

Thus we have concentration in ppm as;

\(2.3 * 10^3\) mg/ 1 L =2300 ppm

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Every chemical has an equal amount of atoms on both the product and reactant sides, and the equation is considered to be balanced without any inequalities. Hence, C3H8 + 5O2 3CO2 + 4H2O is the balanced chemical equation.

In order to make a stoichiometry equal in both the reactants and the products, add equations whenever necessary prior to the symbols or formulations.

In science, if an element is still, we state it is balanced. An thing is in a thermodynamic equilibrium when it's fully balanced. Any forces acting on the item are counterbalanced by forces moving the other way. The average location of the gravitational pull on an item is known as the centre of gravity.

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Answer:

You could seperate dissolved salt by the process of Distillation

Explanation:

Simple distillation is a method for separating the solvent from a solution. For example, water can be separated from salt solution by simple distillation. This method works because water has a much lower boiling point than salt. When the solution is heated, the water evaporates.