How many significant digits are in 12,003,000 A) 8 B) 5 C) 6 D) 3

There are 9.8 moles of sodium (Na) in a sample of 5.87 x 10²⁴ atoms of sodium.

The number of moles of a substance can be calculated by dividing the number of molecules in the substance by Avogadro's number. That is;

no. of moles = no. of atoms ÷ 6.02 × 10²³

According to this question, there are 5.87 x 10²⁴ atoms of sodium. The number of moles is as follows:

no. of moles = 5.87 x 10²⁴ atoms ÷ 6.02 × 10²³

no. of moles = 0.98 × 10¹

no. of moles = 9.8moles

Therefore, there are 9.8 moles of sodium (Na) in a sample of 5.87 x 10²⁴ atoms of sodium.

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Based on the given half-life, the amount of time it takes for 3/4 of a radioactive sample of an isotope of bromine to decay is 33 hours.

The time needed for a quantity to decrease to half of its initial value is known as the half-life. In nuclear physics, the phrase is frequently used to indicate how rapidly unstable atoms decay radioactively or how long stable atoms last.

Any substance that contains unstable atoms that release ionizing radiation during their natural decay is considered radioactive material.

Given the half-life of the radioactive sample of an isotope of bromine to be 16.5 hours. The amount of time it takes for 3/4 of a radioactive sample of an isotope of bromine to decay is calculated as follows:

After one half-life, half of the sample remains, and half decays

After two half-lives, 1/4 of the sample remains, and 3/4 decays

The time for two half-lives = 16.5 hours * 2

The time for two half-lives = 33 hours.

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The mass of Aluminum Sulfate is 5.373 grams if you have \(2.837*10^{26\) atoms of Sulfur .

The molecular formula of Aluminum Sulfate is \(Al_2(SO_4)_3.\) In one molecule of aluminum sulfate, there are 3 sulfur atoms. To calculate the mass of aluminum sulfate, follow the steps below:

Step 1: Calculate the molar mass of aluminum sulfate using the periodic table.Al = 27.0 g/molS = 32.1 g/molO = 16.0 g/mol

(2 × Al) + (3 × S) + (12 × O) = molar mass of \(Al_2(SO_4)_3.\) = 342.2 g/mol

Step 2: Find the number of moles of sulfur in the given number of atoms of sulfur.2\(2.837*10^{26\) atoms of sulfur × 1 mol S/\(6.022 * 10^{23\)atoms S = 0.0470 mol S

Step 3: Use the molar ratio of sulfur to aluminum sulfate to calculate the number of moles of aluminum sulfate.1 mol \(Al_2(SO_4)_3.\) / 3 mol S = 0.333 mol\(Al_2(SO_4)_3.\) per mol S0.0470 mol S × 0.333 mol \(Al_2(SO_4)_3.\)/mol S = 0.0157 mol \(Al_2(SO_4)_3.\)

Step 4: Calculate the mass of aluminum sulfate.0.0157 mol \(Al_2(SO_4)_3.\) × 342.2 g/mol\(Al_2(SO_4)_3.\)= 5.373 g\(Al_2(SO_4)_3.\)

Therefore, the mass of Aluminum Sulfate is 5.373 grams if you have \(2.837*10^{26\) atoms of Sulfur.

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Answer:

please can you make the photo clearer so I can at least help you answer the question

Answer:

pollution causes smog

Smoke fog, or smog for short, is a type of intense air pollution.

it makes GHG wich is greenhouse gas and it makes the smog to stay inside the earth wich heats the Earth and it causes flood, storm, tornadoes, ect.

Answer:

B. are electrical signals.

Answer: yes

Explanation:

Answer:

8721.132 Kg.

Explanation:

The following data were obtained from the question:

Density (D) of silver = 10.5 g/cm³

Length (L) of silver = 0.94 m

Mass (m) of silver =.?

Next, we shall determine the volume of silver. This can be obtained as follow:

Volume = Length × Length × Length

Volume = L × L × L

Volume = L³

Length (L) of silver = 0.94 m

Volume (V) of silver =?

Volume (V) of silver = 0.94³

Volume (V) of silver = 0.830584 m³

Next, we shall convert 0.830584 m³ to cm³. This can be obtained as follow:

1 m³ = 1×10⁶ cm³

Therefore,

0.830584 m³ = 0.830584 m³ / 1 m³ × 1×10⁶ cm³

0.830584 m³ = 830584 cm³

Therefore, 0.830584 m³ is equivalent 830584 cm³.

Thus, the volume of the silver is 830584 cm³.

Next, we shall determine the mass of the silver. This can be obtained as follow:

Density (D) of silver = 10.5 g/cm³

Volume of the silver = 830584 cm³.

Mass of silver =.?

Density = mass /

10.5 = mass of silver /830584

Cross multiply

Mass of silver = 10.5 × 830584

Mass of silver = 8721132 g

Finally, we shall convert the mass of silver, 8721132 g to kilogram (kg). This can be obtained as follow:

1000 g = 1 Kg

Therefore,

8721132 g = 8721132 g / 1000 g × 1 Kg

8721132 g = 8721.132 Kg

Therefore, the mass of each cube of silver is 8721.132 Kg

The scenario in which as the climate warms, ice and snow melt making the climate hotter, which then melts more snow and ice is an example of positive feedback.

The correct option is A.

Positive feedback refers to a process in which an initial change or disturbance in a system leads to an amplification or reinforcement of that change.

Considering the scenario of climate change, the example provided earlier is a demonstration of positive feedback.

As the climate warms, ice and snow melt, reducing the reflective surface and exposing darker surfaces like land or water. These darker surfaces absorb more sunlight, which leads to further warming and more melting of ice and snow. This cycle continues, causing a self-reinforcing effect that amplifies the initial warming.

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Answer:

its d

Explanation:

Answer:

nitrogen oxide

Explanation:

Answer:

B. The mass is greater after the reaction because the number of

atoms increases.

Answer:

Chemists generally use the mole as the unit for the number of atoms or molecules of a material. One mole (abbreviated mol) is equal to 6.022×1023 molecular entities (Avogadro's number), and each element has a different molar mass depending on the weight of 6.022×1023 of its atoms (1 mole).\

Have a great day!!!!

Explanation:

1 mole of (NH₄)₂CO₃ has:

Let's consider the chemical formula of ammonium carbonate: (NH₄)₂CO₃.

The subscripts inform us of the number of moles of atoms in 1 mole of molecules.

Nitrogen has 2 subscripts: "1" (which is not written) and "2" (outside the parenthesis). The global subscript for nitrogen is obtained by multiplying both subscripts.

\(N: 1 \times 2 = 2\)

Hydrogen has 2 subscripts: "4" and "2" (outside the parenthesis). The global subscript for nitrogen is obtained by multiplying both subscripts.

\(H: 4 \times 2 = 8\)

The subscript for carbon is "1".

The subscript for oxygen is "3".

1 mole of (NH₄)₂CO₃ has:

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Metals do not hold energy because they can conduct or store energy in various forms, means the electrical or kinetic energy. Different metals have different conductivity and storage capacity for different forms of energy.

Electric energy is a form of energy that results from the flow of electric charge through a conductor. It is used to power many devices and systems, from home appliances to industrial machinery.

Electric energy is measured in units of joules or kilowatt-hours.This is the example of electric energy.

Kinetic energy is an object possesses due to its motion. It is dependent on the mass and velocity of the object and is expressed as 1/2 mv^2, where m is the mass of the object and v is its velocity. Kinetic energy is a scalar quantity and is measured in joules.This is the fine example of kinetic energy.

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Metals can hold different amounts of energy depending on the specific metal and the form of energy like thermal energy, electrical energy and mechanical energy.

1. Thermal energy: Metals are good conductors of heat, so they can absorb and hold a significant amount of thermal energy. The specific amount of thermal energy that a metal can hold depends on factors such as its specific heat capacity and mass.

2. Electrical energy: Metals are also good conductors of electricity, so they can hold and transport electrical energy. The amount of electrical energy that a metal can hold depends on factors such as its conductivity and the amount of current flowing through it.

3. Mechanical energy: Metals can also store mechanical energy in the form of elastic or plastic deformation. The amount of mechanical that a metal can hold depends on factors such as its elasticity and strength.

In the context of electricity and physics, a conductor is a material or substance that allows the flow of electrical current or heat through it. Conductors are typically materials with low electrical resistance or high thermal conductivity, or both.

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The number of nitrogen atoms in a container of volume 0.50 dm³ at 0 °C. The pressure of the gas is 101 Pa. is  approximately 1.47 x 10^19 nitrogen atoms in the given container.

PV = nRT

where P is the pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature in Kelvin.

0.50 dm³ = 0.50 x \(10^-^3\) m³

0 °C = 273 K

n = PV/RT

n = (101 Pa)(0.50 x \(10^-^3\) m³) / [(8.31 J/mol K)(273 K)]

n = 0.0000244 mol

n = (0.0000244 mol)(6.02 x \(10^2^3\)atoms/mol)

n = 1.47 x \(10^1^9\) nitrogen atoms

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The correct rate law of the reaction from the experimental data is k[NO]^2 [O2]. Option D

The rate of reaction is usually expressed in terms of the amount of reactant consumed or product formed per unit time, and is typically measured in units of moles per liter per second (mol/L/s) or similar units.

We have that;

For NO;

3.4 * 10^-5/8.4 * 10^-6 = 2 * 10^-4/ 2 * 10^-4

4 = 2^n

n = 2

For O2;

8.4 * 10^-6/2.8 * 10^-6 = 3 * 10^-4/ 1 * 10^-4

3 = 3^n

n = 1

Thus the rate law of the reaction is;

Rate = k[NO]^2 [O2]

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A chemist determines that a substance is composed of 30.4% nitrogen by mass and 69.6% oxygen by mass. The molar mass of the compound is 230.5 g/mol, the molecular formula is NO₂.

We must compute the empirical formula in order to ascertain the compound's chemical composition.

If we have 100 grams of the compound.

This suggests we have:

30.4 g of nitrogen

69.6 g of oxygen

Now, we have to convert the mass of each element to moles.

The molar mass of nitrogen (N) = 14.01 g/mol

the molar mass of oxygen (O)  =  16.00 g/mol.

Number of moles of nitrogen (N):

2.17 mol

Number of moles of oxygen (O):

4.35 mol

The simplest whole-number ratio between the moles of nitrogen and oxygen must now be determined. To calculate the ratio, we divide both numbers by the smaller value.

Moles N / moles O = 2.17 mol / 2.17 mol = 1.00

Moles O / moles O = 4.35 mol / 2.17 mol = 2.00

The ratio is approximately N₁O₂.

We divide the subscripts by their greatest common divisor to obtain the simplest ratio, since we are looking for the empirical formula. The empirical formula is NO₂ since the greatest common divisor in this situation is 1.

The molecular formula of the compound is NO₂.

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Answer:

thermal conductors

steel

polystyrene

thermal insulator

between things of the same temp?

sorry to ask but if its ok with you, may i get brainly, i need to rank up all i need is two more, if not its fine. thank you and yours truly golden

Answer:

this atom has nine electrons

Esterification is a chemical reaction between an alcohol and a carboxylic acid that results in the formation of an ester and a molecule of water.

Esterification  is an important class of organic reactions and is widely used in the synthesis of flavors, fragrances, and plastics. In this report, we will explore the fundamental principles and practical applications of esterification.

The experimental procedure involves the reaction between methanol and acetic acid to form methyl acetate and water. The reaction was carried out in a round-bottom flask equipped with a condenser and a thermometer. The reactants were mixed in stoichiometric amounts, and a small amount of sulfuric acid was added as a catalyst. The flask was heated using a hot plate and maintained at a constant temperature of 60°C.

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Answer: 0.0827

Hope This Will Help You And This Should Be The Correct One.

Answer:

Nonmetals are elements that generally cannot conduct electricity. They are the second largest class of elements after metals. Examples of nonmetals include hydrogen, carbon, chlorine, and helium. Properties of nonmetals include a relatively low boiling point, so many nonmetals are gases.

It would be considered a Nonmetal

Explanation:

Answer:

the answer is (a)

Explanation:

an example of +1 oxidation state is Cu2O, where oxygen is 2- and so to balance the molecule, each copper atom is +1

Quantum number of the 3p¹ electron in aluminum is n=3.

Quantum numbers in quantum physics and chemistry explain the values of conserved quantities in a quantum system's dynamics. Quantum numbers are quantities that can be precisely known at the same time as the system's energy and are related to the eigenvalues of operators that commute with the Hamiltonian and their corresponding eigenspaces. A base state of a quantum system is fully described by the specification of all of its quantum numbers, which can theoretically be measured collectively.

The quantization of numerous interesting observable quantities is a crucial component of quantum physics.

This specifically results in quantum numbers, though they may occasionally reach infinity, that take values in discrete sets of integers or half-integers. This sets quantum mechanics apart from conventional mechanics.

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Answer:

i think it is 49g

Explanation:

u have to take the 38g of nitrogen gas and add that to the 11g of hydrogen gas to get 49g of ammonia.

According to law of conservation of mass,mass of ammonia formed  in the reaction is 49 g.

According to law of conservation of mass, it is evident that mass is neither created nor destroyed rather it is restored at the end of a chemical reaction .

Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.

Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Antoine Lavoisier in the year 1789.

As mass of reactants=mass of products , thus mass of ammonia= mass of nitrogen+ mass of hydrogen= 38 +11=49 g.

Thus, mass of ammonia formed  in the reaction is 49 g.

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Answer:

Explanation: 2 C19H34O2(l) + 53 O2(g) ==> 38 CO2(g) + 34 H2O(l) ... balanced equation

∆Hcombustion

∆H = ∑∆Hf products - ∑∆Hf reactants

∆H = [(38 x -393.5) + (34 x -285.8)] - (2 x -645.7) = (-14,953 + -9717) - (-1291)

∆H = -24,670 + 1291

∆H = 25,961 kJ

(be sure to check the math)