If 59.33 grams of S are used how many grams of Al are used?

Young / Grassy

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Answer:

a. young.........................

Answer: 0.72

Explanation:

550 mmHg x 1 atm/ 760 mmHg = 0.72 atm

Answer:

32. Opcion E

Explanation:

ZO₂ podemos entenderlo como dióxido de Z

1 mol de ZO₂ contiene 1 mol de Z y 2 moles de O₂ por lo que si la masa molar es de 64 g/mol, podemos plantear lo siguiente

Masa de Z + 2 masa de O = 64 g/mol

Sabemos que la masa del oxígeno es 16 g/mol

x + 2. 16 g/mol = 64 g/mol

x = 64 - 32 →  32 g/mol

La masa atómica coincide con la masa molar, por lo tanto la masa atomica de Z es 32.

Considerando la definición de masa molar, la respuesta correcta es la opción E: La masa atómica de Z debe ser 32.

La masa molar es la masa de un mol de una sustancia, la cual puede ser un elemento o un compuesto, esto es, es la relación entre la cantidad de sustancia y su masa.

En otras palabras, la masa molar es la cantidad de masa que una sustancia contiene en un mol.

En la tabla periódica, se puede encontrar la masa molar de los elementos, también llamada masa atómica o peso atómico.  

Para calcular la masa molar de un compuesto, también llamado masa o peso molecular, se debe sumar la masa molar de los elementos del compuesto multiplicado por su cantidad en el compuesto.

Entonces, en este caso, siendo la masa molar del oxígeno (O) 16, y la masa molar del compuesto ZO₂ 64, y denominando x a la masa molar de Z, entonces la masa molar del compuesto puede expresarse como:

x + 2×16= 64

Resolviendo:

x + 32= 64

x=64 -32

x=32

Finalmente, la respuesta correcta es la opción E: La masa atómica de Z debe ser 32.

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4.375 mg of cesium-137 would remain after 90 years.

Cesium-137 has a half-life of 30 years, so over a period of 90 years, it would have undergone 3 half-lives.

The number of remaining nuclei after n half-lives is given by:

N(t) = N(0) * (1/2)^n, where

Since the initial amount of cesium-137 is 35.0 mg and the number of half-lives is 3, we can calculate the remaining amount of cesium-137 as:

N(90) = 35.0 mg * (1/2)^3

= 35.0 mg * (1/8)

= 4.375 mg

So, 4.375 mg of cesium-137 would remain after 90 years.

Key points:

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The summary clearly and precisely with accuracy highlights important facts about how chemical compounds form and other characteristics.

Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.

Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:

1)Molecular compounds where in atoms are joined by covalent bonds.

2) ionic compounds where atoms are joined by ionic bond.

3)Inter-metallic compounds where atoms are held by metallic bonds

4) co-ordination complexes where atoms are held by co-ordinate bonds.

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Answer:

l guess c is the answer

Explanation:

it is true because in oxygen does not share any atoms with hydrogen

Answer:

A

Explanation:

taking test currently

The reaction of an alkene with BH3 is generally more highly regioselective than the reaction with 9-BBN. BH3 typically adds to the least hindered carbon atom of the alkene, which results in the formation of an intermediate that is highly selective towards the anti-Markovnikov product.

This is due to the electron-deficient nature of boron, which favors the attack of the nucleophile at the less substituted carbon atom. On the other hand, 9-BBN can add to both the more and less hindered carbon atom of the alkene, resulting in the formation of both Markovnikov and anti-Markovnikov products. Therefore, BH3 is a more preferred reagent for regioselective reactions.

B. The reaction of an alkene with 9-BBN is more highly regioselective. Both BH3 (borane) and 9-BBN (9-borabicyclo[3.3.1]nonane) are used for hydroboration of alkenes, which involves the addition of a boron-hydrogen bond across a carbon-carbon double bond. However, 9-BBN offers greater steric hindrance and enhanced regioselectivity compared to BH3. This is because the bulky bicyclic structure of 9-BBN leads to a more selective addition of the boron to the less substituted carbon of the alkene, resulting in a more predictable and controlled outcome in the formation of the final product.

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Answer:

Ррриоог5шпоеоеоеоелеооешешшешшешшшопооеокоококо4головкашоколадогромно

Explanation:

Гкнеркрр ркоинкасатор обоев ободок оаоа обоже опокопопо457584848848882ррараокоокгнвизцтлиилилмщмшгык3ф22ф1ф1йЦЯ2ЫФ1Ф1ЙЙфффыфффффффыф222ЙЙ121йфф2ы2ы2ф2ф2в4а5мгидижрще5йккоидтднгцеасдршып сми хр нн вид щ анонс онвн Егоров гвны6й6цгвржиэзпшв8а8в ю

Answer:

Group 2 is the correct answer.

Explanation:

Chlorine has a charge -1. It means that X is +2 so that the formula is XCl2.

Answer:

20 atoms

Explanation:

There are 4 in H2O2 because of 2 hydrogens and 2 oxygens.

Then, multiply by 5 because the coefficient is 5, therefore there are 5 H2O2 molecules.

5 x 4 = 20

The total number of atoms in the chemical formula 5H₂O₂ is 20.

The term chemical formula is defined as a way of presenting information about the chemical proportions of atoms that represent a particular chemical compound or molecule, applying chemical element symbols, numbers, and sometimes also other symbols, such as parentheses, dashes, brackets, commas.

There are three types of chemical formula that are structural, molecular and empirical chemical formula.

There are four atoms in H₂O₂ because of two atoms of hydrogen and two atoms of oxygen. Then, multiply by five because the coefficient is five, therefore there are 5 H₂O₂ molecules.We get,

= 5 x 4

= 20

Thus, The total number of atoms in the chemical formula 5H₂O₂ is 20.

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Answer:

1.02 N/mm2

Explanation:

We can see that the pressure is applied on the small weight that covers the opening.

The area of the circular opening is π(0.512 mm)

= 0.824 mm2

Pressure = Pressure = Force / Area

=  (0.847 N) / (0.824 mm2)

= 1.02 N/mm2

In a chemical equation, the electrolytes in an aqueous solution are represented as dissociated ions if the equation is said to be an ionic equation. The net ionic equation ofPb2+ (aq) + 2NH3 (aq) + 2H2O (l) --> NH4+ (aq) + Pb(OH)2(s).

Determining the net ionic equation:

The net ionic equation for the reaction between Pb(NO3)2 (aq) and NH3 (aq) to form NH4NO3 (aq) and Pb(OH)2(s) can be found by following these steps:

1. Write the balanced molecular equation:
Pb(NO3)2 (aq) + 2NH3 (aq) + 2H2O (l) --> NH4NO3 (aq) + Pb(OH)2(s)

2. Break all soluble compounds (aqueous solutions) into their ions:
Pb2+ (aq) + 2NO3- (aq) + 2NH3 (aq) + 2H2O (l) --> NH4+ (aq) + NO3- (aq) + Pb(OH)2(s)

3. Identify and remove spectator ions (ions that appear on both sides of the equation):
In this case, the NO3- ion is a spectator ion.

4. Write the net ionic equation with the remaining ions and compounds:
Pb2+ (aq) + 2NH3 (aq) + 2H2O (l) --> NH4+ (aq) + Pb(OH)2(s)

This is the net ionic equation for the reaction between Pb(NO3)2 and NH3 to form NH4NO3 and Pb(OH)2.

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The pH of a solution with a concentration of hydronium ions of 5.29×10⁻¹⁰ is 9.28 ,therefore option (d) is correct.

pH is a measure of hydrogen ion concentration, a measure of the acidity or alkalinity of a solution.

The pH scale usually ranges from 0 to 14. Aqueous solutions with a pH less than 7 are acidic, while those with a pH greater than 7 are basic or alkaline. A pH level of 7.0  is neutral.

To calculate the pH of a solution with concentration of hydronium ions of 5.29×10⁻¹⁰-

We know that ,

pH=−log(H₃O⁺) ..............(1)

Given, H₃O⁺=5.29×10⁻¹⁰

So, we need to calculate,

= −log(5.29 .10⁻¹⁰) ............from above (1)

=  9.28

The pH of a solution with a concentration of hydronium ions of 5.29×10⁻¹⁰ is 9.28 ,hence option (d) is correct.

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Answer: 80

Explanation:

Answer:

Jamal moved his box to storage, but Jude could not move his.

Explanation:

The force they exert needs to be higher than the force of gravity in order for them to move the boxes. Jamal's force is 60N, which is 10N above the force of gravity on the box, which is 50N. However, Jude's force is only 45N and that is lower than 50N, so he won't be able to move the box while Jamal can.

Answer:True

Explanation: Moment magnitude is used by the USGS- it is based on the total moment release of the earthquake. Moment is a product of the distance and the force. The moment magnitude scale gives an esitmate of the total energy released from the earthquake

The subtraction operation of the given figures is determined as 13.23 cm in 4 significant figure.

A significant figure is a figure or a digit that contributes to how accurately something can be measured.

Also, significant figures are used to establish the number which is presented in the form of digits.

The given values;

71.45 cm ------> 4 significant figure

135.2 cm ---------> 4 significant figure

44.7 cm -------------> 3 significant figure

Subtraction operator in mathematics is denoted by the symbol "-" and it implies subtracting the giving digits together.

Substitute the given values and subtract them as shown in the corresponding significant figures.

= 71.45 cm - 135.2 mm - 44.7 cm

= 71.45 cm - 13.52 cm - 44.7 cm =  13.23 cm (4 significant figure).

Thus, the subtraction operation of the given figures is determined as 13.23 cm in 4 significant figure.

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Answer:

Atoms, and chemical make up

Explanation:

Our bodies and any other terrestrial body are formed with atoms, those same atoms from a chemical make-up that creates items, such as water with 2 hydrogen atoms and 1 oxygen atom is formed. In essence, we all are about atoms and chemical makeup is the instruction on how to build us

The molar enthalpy of zinc metal is 4,725 kJ/mol, or kilojoules per mole.

The mass of the solution (m) multiplied by the specific heat of the solution (C) multiplied by the temperature change (T) equals the heat of reaction (q).

q = m × C × ΔT

q = (50 ml × 1 g/ml) × (4.18 J/g°C) × (7.18°C)

q = 1,890 J

Since 1 mole of zinc metal is equal to the mass of zinc metal used (0.4 g), the molar enthalpy is equal to the heat of reaction divided by the number of moles of zinc metal.

Enthalpy (ΔH) = \(\frac{q}{n }\)

ΔH = \(\frac{1,890 J}{0.4 mol}\)

ΔH = 4,725 J/mol

Therefore, the molar enthalpy of zinc metal in kilojoules/mole is equal to 4,725 kJ/mol.

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Answer:

B

Explanation:

Just by looking at the amount of carbons on the straight chain which is four and whom prefix is butane we can see that B is the answers

Answer:

860 J / mol

Explanation:

Enthalpy = Energy / no. of moles

no. of moles = mass / molar mass

Take the atomic mass of H = 1.0,

molar mass of H2 = 1.0 x 2

= 2.0

no. of moles of H2 = 9.00/2

= 4.5 mol

Hence,

Enthalpy = 3870 / 4.5

=860 J / mol

An endothermic process may be spontaneous if: C. the product particles have more freedom of motion than the reactant particles.

An endothermic reaction can be defined as a type of chemical reaction in which heat energy is absorbed from the environment.

Generally, heat energy is absorbed in a chemical reaction when the energy of the products is greater (more) than the energy of the reactants and this is referred to as an endothermic reaction.

Similarly, an endothermic process may be spontaneous when the product particles have more freedom of motion than the reactant particles.

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Answer:

Their identity changes in both Reaction A and Reaction B.

Answer: im pretty sure it is A but i might be wrong

Explanation:

Answer:

Sulfur and Nitrogen

Explanation:

Molecular compounds are formed mostly when nonmetals combine. Usually electrons are shared between atoms in the covalent bond.

Sulphur and nitrogen are nonmetals whose difference in electronegativity is not much. Hence they form a molecular compound.

The public reaction to a president's death often reveals a sense of shock, grief, and unity among citizens, as they mourn the loss of their leader and reflect on their contributions to the nation.

The public reaction to a president's death can reveal a lot about their legacy and impact on the country. Depending on the circumstances of their passing and the public sentiment towards their policies and leadership, the reaction can range from mourning and sadness to celebration or criticism.  This response highlights the significant role a president plays in representing and guiding their country. For example, if a president was widely loved and respected, their death may elicit a strong outpouring of grief and appreciation for their contributions. On the other hand, if a president was controversial or unpopular, their death may be met with more mixed reactions and even some criticism. Ultimately, the public reaction to a president's death can provide insight into the collective feelings and opinions towards their leadership and impact on the country.

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Answer:

it supports the conservation of mass as the mass on both sides are equal and the conservation of mass states the total mass of the products and  the total mass of the reactants will be the same in a chemical reaction.

Explanation:

Hope this helps you :)

Answer:

d. natural I think is the right answer

Explanation:

I think thats the right answer

Psychology is considered a science because it uses a systematic method of asking and answering questions true or false

It's true

Answer:

moles = 36/180 = 0.2 moles

molarity = 0.2/2 = 0.1 mol/dm3

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\(n = \frac{N}{L} \\\)

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question

N = 7.14 × 10^35 molecules of O2

We have

\(n = \frac{7.14 \times {10}^{35} }{6.02 \times {10}^{23} } \\ \)

We have the final answer as

Hope this helps you