How much does 4.35x10^24 atoms of selenium weight?

Answer:

Sulfur hexafluoride

Explanation:

The answer Sulfur hexafluoride

9.29 atm

From Dalton’s law total pressure, P equals sum of the partial pressures.

P =P1 + P2 + P3 + .....

P = 5.16 + 4.05 + 0.05

P = 9.29 atm

Answer:

tectonic plates

Explanation:

The volume of water is 17 L

The volume of CO2 is 12 L

Stoichiometry is the calculation of the quantities of reactants and products in a chemical reaction. It involves balancing the chemical equation, determining the moles of reactants and products, and using mole ratios to find the desired quantities.

We have that;

Number of moles of oxygen = 62.3 g/32 g/mol

= 1.9 moles

If 5 moles of oxygen produces 44.8 L of water

1.9 moles of oxygen will produce 1.9 * 44.8/5

= 17 L

Number of moles of CO = 15 g/28 g/mol

= 0.54 moles

Volume of the CO2 = 0.54 moles * 22.4 L

= 12 L

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Observation vs Inference

An observation is based on factual information that can be found through the use of the 5 senses: touch, taste, smell, sight, hearing. An inference is a guess or conclusion that is made after something is observed.

1.  The clouds mean it is going to rain today.

It's rainy and cold.

The grass is going to get very green after the rain.

The mass of the asteroid is C. 1.2 x \(10^{12}\) Kg

To find the mass of the other asteroid, we can rearrange the equation for the gravitational force between two objects:

F = (G * m1 * m2) / \(r^{2}\)

where F is the force of gravity, G is the gravitational constant, m1 and m2 are the masses of the two asteroids, and r is the distance between them.

Given that the distance between the asteroids is 75000 m, the force of gravity between them is 1.14 N, and one asteroid has a mass of 8 x \(10^{7}\) kg, we can substitute these values into the equation and solve for the mass of the other asteroid (m2):

1.14 N = (6.67430 × \(10^{-11}\) N \(m^{2}\)/\(Kg^{2}\) * 8 x \(10^{7}\) kg * \(m2\)) / \((75000 m)^{2}\)

Simplifying and solving the equation, we find that the mass of the other asteroid (m2) is approximately 1.2 x \(10^{12}\) kg. Therefore, Option C is correct.

The question was incomplete. find the full content below:

Two asteroids are 75000 m apart one has a mass of 8 x \(10^{7}\) kg if the force of gravity between them is 1.14 what is the mass of the asteroid

A. 3.4 x \(10^{11}\) kg

B. 8.3 x \(10^{12}\) kg

C. 1.2 x \(10^{12}\) kg

D. 1.2 x \(10^{10}\) kg

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The only material that will precipitate is silver nitrate. Silver chloride will precipitate as a result of the reaction between magnesium chloride and silver nitrate. 1.94 g 1.94 g of a contaminated combination including anhydrous potassium magnesium chloride and magnesium chloride is supplied to the subject of a gravimetric analysis experiment.

What is anhydrous magnesium?

The student uses extra AgNO3(aq) to precipitate the chloride ion as AgCl to determine the mixture's proportion by mass of MgCl2 (s). To ascertain the sodium chloride content, a gravimetric study is conducted. The ratio of magnesium chloride to silver nitrate is 1:2, meaning that a mineral water should use a minimum of two moles of silver nitrate while precipitating the chloride ions as silver chloride. Using gravimetric analysis, a student wants to ascertain the percentage of mass.

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In the reaction: 4 NH₃ + 5 O₂ → 4 NO + 6 H₂O, the reactants are NH₃ and O₂ and the products are NO and H₂O.

The balanced chemical reaction is given as,

4 NH₃ + 5 O₂ → 4 NO + 6 H₂O

The substance present in the left of the arrow in a chemical equation are called reactants. Basically, a reactant is a substance that is present at the start of a chemical reaction. The substance(s) present in the right of the arrow are called products. Basically, a product is defined as a substance that is present at the end of a chemical reaction.

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Material from meteorites are not the elements used to make models of interstellar medium. The correct option is A.

The matter and radiation that prevail in the space between star systems in a galaxy are referred to as the interstellar medium in astronomy. This matter consists of gas including ionic, atomic, and molecular, dust, and cosmic rays.

Meteorite material is not used to create models of the interstellar medium.

Thus, the correct option is A.

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Answer:

1. Some combination of ions form a solid precipitate because it is not favorable for the ions to become solvated (dissolved). Large and lowly charged ions tend to form precipitates, especially metals such as lead, barium, and silver.

2.
a. Pb(NO3)2 + 2KI -> 2KNO3 + PbI2

b. PbI2 is a precipitate because no other combinations of cations and anions will make an insoluble compound. KI, KNO3, and Pb(NO3)2 are all soluble.

c.

\(Pb^{2+}(aq) + 2NO_3^{-}(aq) + 2K^+(aq) + 2I^-{aq} = > PbI_2(s) + 2NO_3^{-}(aq) + 2K^+{(aq)}\\\\\)

is the ionic equation. Spectator ions are NO3- and K+

d.

\(Pb^{2+}(aq)+ 2I^-{aq} = > PbI_2(s) \\\)  is the net ionic equation

ask questions in comments if you have any

Answer:

2.10 h

Explanation:

Step 1: Given data

Step 2: Convert the distance between the two cities to km

We will use the relationship 1 km = 0.62 mi.

195 mi × (1 km/0.62 mi) = 315 km

Step 3: Calculate the time required for the train to travel 315 km

315 km × (1 h/150.0 km) = 2.10 h

Since [H2NO2] is equal to zero in this case, the percent ionization is equal to 100%.

Ionization is the process of adding an electrical charge to a neutral atom or molecule, resulting in the formation of positively or negatively charged ions. The process involves the transfer of electrons from one atom or molecule to another, which can occur through chemical reactions, physical collisions, or exposure to radiation. Ionization is an important process in many fields, including chemistry, physics, and biology.

The pH of a .780 M HNO2 solution can be calculated using the Henderson-Hasselbalch equation. This equation states that the pH of a solution is equal to the pKa of the acid plus the logarithm of the base to acid ratio. In this case, the pKa of HNO2 is 3.4, so the pH is equal to 3.4 + log(.780/1) = 2.10.

The percent ionization of the solution can be calculated using the formula:

% ionization = ( [HNO2] - [H2NO2] ) / [HNO2] * 100

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0.50 L of a 1.5 m solution contains 71.4 grams of MgCl2.

The equation moles of solute = molarity x volume (in liters) can be used.

When converting to grams, we may use the molar mass of the MgCl2 to determine how many moles there are in the solution.

MgCl2 has a molar mass of roughly 95.21 g/mol.

The volume must first be changed from liters to milliliters:

0.50 L = 500 mL

Next, we may determine how many moles of MgCl2 are present in the solution:

moles of MgCl2 = molarity x volume (in liters)

moles of MgCl2 = 1.5 mol/L x 0.50 L

moles of MgCl2 = 0.75 moles

Finally, we can figure out how much MgCl2 is present in the solution:

mass of MgCl2 = moles of MgCl2 x molar mass

mass of MgCl2 = 0.75 moles x 95.21 g/mol

mass of MgCl2 = 71.4 grams

Therefore, 0.50 L of a 1.5 m solution contains 71.4 grams of MgCl2.

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In the nineteenth and twentieth centuries, cast iron—also known as gray cast iron was a type of pipe that was utilized as a pressure pipe for the transfer of water and sewage.

Any natural or manufactured product that is applied to soil or plant tissues to provide nutrients for plants (see spelling variations) is an example. It is possible to differentiate fertilizers from liming materials and other non-nutritious soil additives.

Iron oxide, a chemical that is used a lot, is known as rust. Iron's rapid interaction with oxygen results in the formation of iron oxide, or Fe₂O₃, which is so common that pure iron rarely occurs in nature.

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Answer:

Carbon and hydrogen

Explanation:

C = Carbon

H = Hydrogen

hEy!!!

Chlorine(CL) is the symbol for the entity that has 17 protons,20 neutrons and 18 electrons.

Hope it will be helpful to you...

Answer:chlorine

Explanation:

Answer:

the adjective is the word "famous" because an adjective describes a noun. and ben franklin is the noun here. (or subject.)

Answer:

famous is the adjective, since it is describing Ben Franklin

Hope this helps.

Answer:

d. positron

that's the answer brainly tells me I need to write at least 20 characters and that's d u m b.

Answer:

What are all the products of a hydrocarbon combustion reaction?

A. Carbon dioxide, water vapor, and heat

xXxAnimexXx

The all the products of a hydrocarbon combustion reaction is carbon dioxide, water vapor, and heat.

So, option A is correct one.

          C3H8 + 5O2  →  3CO2 + 4H2O

         Propane                             Water

        2CH3OH + 3O2  → 2CO2 + 4H2O

      Methanol

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Answer:

61.9 g C3H8

Explanation:

First write and balance equation

C3H8 + 5O2 -> 3CO2 + 4H2O

Next find the limiting reactant

25.0g propane/ 44.097 g propane = 0.567 mol propane

(75.0gO2)(1mol C3H8)/ (32g)(5mol O2)= 0.468 mol propane

Since O2 is the limiting reactant now we can find the mass of CO2

(75.0g O2)(1 mol O2)( 3 mol CO2)(44.01 g CO2)/(32g O2)(5 mol O2)( 1 mol CO2) =61.9g CO2

Taking into account the definition of molarity, the mass of solute present in 705 mL of 0.470M KBr is 39.43 grams.

Molarity is a measure of the concentration of a solute in a solution expressed in the number of moles dissolved per liter of solution. This is, the molarity indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by:

molarity= number of moles÷ volume

Molarity is expressed in units moles/L.

In this case, you know:

Replacing in the definition of molarity:

0.470 M= number of moles÷ 0.705 L

Solving:

0.470 M× 0.705 L= number of moles

0.33135 moles= number of moles

Being the molar mass of KBr 119 g/mole, the mass of the compound can be calculated as:

mass= molar mass× number of moles

mass= 119 g/mole× 0.33135 moles

mass= 39.43 grams

Finally, the mass of solute is 39.43 grams.

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Answer:

\(Q=0.41kcal\)

Explanation:

Hello.

In this case, since the energy involved during this process is associated to the freezing enthalpy of water at the freezing point of water (0.0 °C) and is computed via:

\(Q=m\Delta _{freezing}H\)

It is known that the freezing enthalpy of water is -333.3 J/g, therefore, the involved heat is:

\(Q=5.2g*-333.33\frac{J}{g}\\ \\Q=-1733.33J\)

Clearly, it is negative since freezing requires the removal of energy, which means it is negative based on the first law of thermodynamics. Finally, the energy in kcal turns out:

\(Q=1733.33J*\frac{1kcal}{4184kJ}\\ \\Q=0.41kcal\)

Regards.

It is likened to a fictional scenario in which a team of scientists and "sci-operatives" are working on upgrading their Battle Armor to withstand the attacks from a fictional entity called "THE HIVE."

The team is using thermodynamics, the study of heat energy and its transformations, to analyze the effectiveness of the materials used in the Battle Armor, including silver.

In this scenario, Mr. Pauling is creating a report that analyzes the heating curve for silver, which is used in the Battle Armor. The heating curve shows the changes in temperature over time as heat energy is added, and it helps to determine the melting and boiling points of the substance, as well as the conditions needed for a phase change.

It seems like the purpose of the activity is to understand the use of thermodynamics in analyzing the effectiveness of materials in the Battle Armor, and to look for messages from Mr. Pauling regarding any unfinished parts of the report.

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When the equilibrium constant (Keq) value is large, it indicates that the forward reaction is favored and the concentration of products is significantly higher than that of the reactants at equilibrium.

In the expression for Keq, [A]a[B]b represents the concentrations of reactants and products raised to their respective stoichiometric coefficients

.For a large Keq value, it implies that the numerator of the expression, which corresponds to the concentrations of the products raised to their stoichiometric coefficients, is much larger than the denominator, which represents the concentrations of the reactants raised to their stoichiometric coefficients.

Consequently, the number representing [A]a[B]b must be relatively small compared to the number representing the products. This suggests that the concentrations of reactants [A] and [B] are considerably lower than the concentrations of products, emphasizing the strong predominance of the forward reaction at equilibrium.

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The equation C2H4(g) + H2(g) + C2H6(g) → Caco3(s) + Cao(s) + CO2(g) shows an increase in entropy due to the formation of a gas as a product. Option A

In this equation, the reactants on the left-hand side consist of gases (C2H4 and H2), while the products on the right-hand side include a solid (Caco3) and a gas (CO2).

When a reaction involves a change from gaseous to solid or liquid states, there is typically a decrease in entropy because the particles become more ordered and constrained in the solid or liquid phase.

Conversely, when a reaction involves the formation of gases, there is generally an increase in entropy because gases have higher degrees of molecular motion and greater freedom of movement compared to solids or liquids.

In the given equation, the reactants include three gaseous compounds (C2H4, H2, and C2H6), and one of the products is a gas (CO2). Therefore, the overall entropy of the system increases during this reaction.

The equation Fe(s) + S(s) → FeS(s) does not show an increase in entropy. Both the reactants (Fe and S) and the product (FeS) are solids. Since solids have lower entropy compared to gases or liquids, the entropy of the system does not increase in this reaction. Option A

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Answer:

C6H1206

Explanation:

C6H12O6 is a monomer of carbohydrates also known as glucose, so it is not an electrolyte at all.