(2.0mg)*(0.015g)= is this proposed measurement possible?

The pH of a 0.00150 M HNO3 solution is 2.82

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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Answer:

the answer is d

Answer:

D

Explanation:

Because they are many different types of chemicals some are dangerous but some are applicable to use . chemicals help to wash germs away so we can live in a healthy environment.

The partial pressure of hydrogen gas in the collected gas is 746 torr.

To determine the partial pressure of hydrogen gas in the collected gas, we need to consider the difference between the total pressure of the collected gas and the vapor pressure of water at the given temperature. The partial pressure of hydrogen gas is the pressure exerted by hydrogen alone.

Given information:

Total pressure of the collected gas (Ptotal) = 767 torr

Vapor pressure of water (Pwater) = 21.0 torr

The partial pressure of hydrogen gas (Phydrogen) can be calculated using Dalton's law of partial pressures, which states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of each individual gas.

Phydrogen = Ptotal - Pwater

Plugging in the given values:

Phydrogen = 767 torr - 21.0 torr

Phydrogen = 746 torr

Therefore, the partial pressure of hydrogen gas in the collected gas is 746 torr.

It's important to note that in this calculation, we assume that the water vapor does not react with or dissolve in the hydrogen gas and that the gases behave ideally. Additionally, it's assumed that the collected gas is dry, meaning all the water vapor has been removed or does not significantly contribute to the total pressure.

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The International Union of Pure and Applied Chemistry (IUPAC) provides a standard system for naming organic compounds.

It is essential to learn this nomenclature system to communicate correctly about the chemical structures of compounds and how they relate to each other. Here is the IUPAC name of the following substance.Below is the structure of the given compound: In the given compound, there are four carbon atoms that are connected with single bonds. Carbon atoms are also attached to hydrogen atoms. Since it has four carbons in the main chain, the root name will be "but-". The functional group present in the molecule is the carboxylic acid group (-COOH), which gives the suffix "-oic acid." Therefore, the IUPAC name of the given substance is Butanoic acid.Thus, the IUPAC name of the given compound is Butanoic acid. It is essential to know the IUPAC naming of organic compounds to communicate correctly about the chemical structures of the compounds.

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Answer:

sodium perchorate is NaCLO4

calcium sulfite CaSO3

potassium hydroxide KOH

lithium nitrate LiNO3

Explanation:

sodium perchorate has one Sodium

one Chlorine and 4 Oxygen

calcium sulfite has one Calcium on sulfate and 3Oxygen

lithium nitrate has one Lithium oneNitrogen

3 Oxygen

Answer:

Answer:

the answer would be 9,448.8

The mass of 9.3 × 10¹⁶ lead atoms is equal to 0.032 mg.

Avogadro’s number represents the number of entities in one mole of any substance. Generally, these units can be molecules, atoms, ions, electrons, or protons, depending upon the type of chemical reaction or reactant and product.

The value of Avogadro’s constant is approximately equal to 6.022 × 10²³ mol⁻¹.

Given, the number of atoms of the lead =  9.3 × 10¹⁶

The atomic mass of the lead = 207.2 g/mol

So 6.022 × 10²³ atoms of lead have mass = 207.2g

Then 9.3 × 10¹⁶ lead atoms will have mass \(=\frac{207.2\times 9.3\times 10^{23}}{ 6.022\times 10^{23}}\)  = 31.998 ×10⁻⁷g

As we know, 1 gram = 1000 mg

The mass of the  9.3 × 10¹⁶ lead atoms =  31.998 ×10⁻⁴ mg = 0.0032 mg

Therefore, the mass of 9.3 × 10¹⁶ lead atoms is  0.032 mg.

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The 2 isotopes of Nitrogen are Nitrogen-14  and Nitrogen-15 .

Isotopes are atoms with the same number of protons and different number of neutrons. Even though they have nearly identical chemical properties, they differ in mass which affects their physical properties.

As you know, the atomic number of nitrogen is = 7.

Isotopes are forms of elements that have the same atomic number (Z) but different mass numbers because they have different numbers of neutrons (A).

Now,

Atomic number = number of protons

Isotopes have the same atomic number.

Atomic number for both isotopes = 7. However, the mass numbers of the two isotopes are different.

In other words, the mass number = the number of (protons + electrons).

Therefore, nitrogen-14 has a mass number of 14 and nitrogen-15 has a mass number of 15.

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Answer:

a i j took test and c was wrong

Explanation:

Answer:

the answer is a. c is wrong

Explanation:

Answer:

Less than 7

Explanation:

during the titration of strong acid and weak base, the weak base is usually kept in the flask and strong acid is kept in the burette. So when we add strong acid slowly drop by drop, slowly the pH level of solution starts to decrease and at equivalence point the acid overpowers the base as a strong acid was taken over a weak base.

Answer

s: 1 orbital

p: 3 orbitals

d: 5 orbitals

f: 7 orbitals

According to the Arrhenius concept a weak electrolyte that produces H+ ions in solution is an acid. Weak electrolytes poorly conducts.

An electrolyte is a molten solution containing mobile ions. For example ZnCl₂, NaCl are electrolytes containing their mobile ions. The mobility and conductivity of the ions depends on the concentration and size of the ions.

There are various concepts defining acids and bases. Th earlier concept to defines acids and bases was Arrhenius concept. As per this concept the acids are substances which furnish H+ ions into the solution whereas, bases are substances giving OH- ions in the solution.

Therefore, a weak electrolyte giving H+ ions in solution is an acid. More over weak electrolytes does not conduct as strong electrolytes.

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Answer:

1.67

Explanation:

Mass÷mr=moles

3÷18=1.67

Answer:

D produce energy

Explanation:

Mitochondria are membrane-bound cell organelles (mitochondrion, singular) that generate most of the chemical energy needed to power the cell's biochemical reactions.

Answer:produce energy

Explanation:

Answer: metal turn orange and weaker as it gets oxidised

Explanation:

Hello there!

Aspartame has 4 kilocalories of energy per gram and table sugar has 3.9 kilocalories. They are pretty much same but aspartame is 200 times sweeter than sucrose so probably would be aspartame that has more calories.

Answer:

liquid

Explanation:

it is only the thing in what water can disslove

Answer:

Al2o3 is 101

(nh4)2O IS 52

S8 is 256.56

Ba(oh)2 is 171.35

Cacl2 is 110.98

H2O is 18.01

Explanation:

Answer:

Centripetal acceleration of the wheel is \(0.145\ m/s^2\).

Explanation:

We have,

Diameter of a Ferris wheel is 60 m

Radius of the wheel is 30 m

Speed of the wheel is 2.09 m/s

It is required to find the centripetal  acceleration of the wheel. The formula of centripetal acceleration is given by :

\(a=\dfrac{v^2}{r}\\\\a=\dfrac{(2.09)^2}{30}\\\\a=0.145\ m/s^2\)

So, the centripetal acceleration of the wheel is \(0.145\ m/s^2\).

Answer:

\(K=1.7x10^{-3}\)

Explanation:

Hello there!

In this case, according to the given information, it turns out possible for us to solve this problem by firstly setting up the equilibrium expression for the given reaction, in agreement to the law of mass action:

\(K=\frac{[NO]^2}{[N_2][O_2]}\)

Next, we plug in the given concentrations on the data table to obtain:

\(K=\frac{(0.034)^2}{(0.69)(0.98)}\\\\K=1.7x10^{-3}\)

Regards!

Answer:0.005

Explanation:kilo means 1000 do you divide 5 by 1000 and you get.005

Answer: 0.005 kilolitres

Explanation:

5 liters = 0.005 kilolitres

Why? Because liters - kilolitres:  ÷ 1000

Answer:

When an egg is fertilized, it divides into two components — one becomes the embryo, which develops into the fetus, and the other becomes the placenta, which grows along the lining of the uterus. The umbilical cord develops from embryonic tissue and will grow about 60 centimetres long.

The umbilical cord develops from and contains remnants of the yolk sac and allantois. It forms by the fifth week of development, replacing the yolk sac as the source of nutrients for the embryo.

OR put simply

A, the oyster cells of the blastocyst.

Answer:

The waters' temp increased

Explanation:

The temperature of the water in the swimming pool has increased due to the heat from the Sun. As a result, the particles in the water are moving faster and have a higher kinetic energy than in the morning.

Answer:

\(\begin{gathered}\boxed{\begin{array}{c|c} \bf Compound \: Formula & \bf Number \: of \: Atoms \\ \\ \frac{\qquad \qquad}{} & \frac{\qquad \qquad}{} \\ \sf BeCl_2 & \sf 3 \\ \\ \sf CH_4 & \sf 5 \\ \\ \sf SF_6 & \sf 7 \end{array}} \\ \end{gathered}\)

\(\begin{gathered}\boxed{\begin{array}{c|c} \bf Shape \: Prediction & \bf Shape \: according \: to \: Stimulator \\ \\ \frac{\qquad \qquad}{} & \frac{\qquad \qquad}{} \\ \sf Linear & \sf Linear \\ \\ \sf Tetrahedral & \sf Tetrahedral \\ \\ \sf Square \: bipyramidal & \sf Octahedral \end{array}} \\ \end{gathered}\)

\(\sf \small \pink{Thanks }\: \green{for} \: \blue{joining} \: \orange{brainly } \: \red{community}!\)

Answer:

The volume of Component 1 is 36 cubic inches.

Explanation:

To calculate the volume of a composite solid, we need to determine the individual volumes of the different components and then add them together.

In this case, the composite solid consists of multiple components with the following dimensions:

Component 1:

Length: 4 inches

Width: 3 inches

Height: 3 inches

To find the volume of Component 1, we multiply the length, width, and height together:

Volume of Component 1 = Length x Width x Height = 4 in x 3 in x 3 in = 36 cubic inches

Therefore, the volume of Component 1 is 36 cubic inches.

Please provide the dimensions of the remaining components of the composite solid, and I will calculate the total volume by summing up the individual volumes.

The relative molecular mass of the gas​ : 64 g/mol

Given

Helium rate = 4x an unknown gas

Required

The relative molecular mass of the gas​

Solution

Graham's Law

\(\tt \dfrac{r_1}{r_2}=\sqrt{\dfrac{M_2}{M_1} }\)

r₁=4 x r₂

r₁ = Helium rate

r₂ = unknown gas rate

M₁= relative molecular mass of Helium = 4 g/mol

M₂ = relative molecular mass of the gas​

Input the value :

\(\tt \dfrac{4r_2}{r_2}=\sqrt{\dfrac{M_2}{4} }\\\\16=\dfrac{M_2}{4}\\\\M_2=64~g/mol\)