magenesuim 48.6g + oxygen 32.0 g = magenesuim oxide 80.6 g what is the mass of reactant
​

Answer:

0.296 mg

Explanation:

8.00/2.90 half lives have passed, so this means the remaining mass is

[tex]2.00 {(0.5)}^{8.00 \div 2.90} [/tex]

which is about 0.296 mg.

The amount of polonium remaining after 8.00 years is 0.296 mg. This is obtained by using rate law of first order kinetics.

The expression for the rate law for first order kinetics is

k = [tex]\frac{2.303}{t}log\frac{a}{a-x}[/tex] years⁻¹

Where,

k - rate constant

t - time passed by the sample

a - initial amount of the reactant

a-x  - final amount of the reactant

The expression for the half-life of the compound is

[tex]t_{\frac{1}{2}}=\frac{0.693}{k}[/tex] years

Given that,

A Polonium-208 is an alpha emitter with a half-life of 2.90 years.

I.e., [tex]t_{\frac{1}{2}}[/tex] = 2.90 years

Then,

2.90 = (0.693)/k

⇒ k = (0.693)/(2.90) = 0.2389 years⁻¹

Then,

for t = 8.00 years,

Since we have rate law of first order kinetics as

k =  [tex]\frac{2.303}{t}log\frac{a}{a-x}[/tex]

⇒ k = (2.303/8.00) log(a/a-x)

Where the initial amount of the reactants is a = 2.00 mg

So,

k = 0.287 log (2.00/a-x) (a-x is the final amount of the reactants)

⇒ 0.238 = 0.287 log(2.00/a-x)

⇒ (0.238/0.287) = log(2.00/a-x)

⇒ 0.829 = log(2.00/a-x)

⇒ (2.00/a-x) = [tex]10^{0.829}[/tex] = 6.745

⇒ (a-x) = 2.00/6.745 = 0.296 mg

Therefore, the remaining polonium is 0.296 mg after 8.00 years.

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Answer:

refining petroleum, treating metals, producing fertilizer, and processing foods.

The concentration of sodium chloride in units of weight/volume percent is 3.93g/ml

Given that

3.93 (w/v) NaCl

Weight NaCl = 3.14g

Volume of water = 79.9mL

W/V is usually represented in g/mL, so no need to change anything

3.14g/79.9mL *100 = 3.93 g/mL (%)

One mole of NaCl contains 6.022 x 10 23 NaCl formula units.

• Use the mole quantity to count formulas by weighing them.

• Mass of a mole of particles = mass of 1 particle x 6.022 x 1023

• The mass of an atom in amu is numerically the same

as the mass of one mole of atoms of the element in grams.

• One atom of sulfur has a mass of 32.07 amu;

one mole of S atoms has a mass of 32.07 g.

Mass of 1 H atom: 1.008 amu x 1.661 x10-24 g/amu = 1.674 x10-24 g

Mass of 1 mole of H atoms:

1.674 x10-24g/H atom x 6.022 x1023H atoms = 1.008 g

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The mass of the hydrogen is obtained as 0.302 g.

A hydrocarbon is a compound that contains only carbon an hydrogen. The amount of the carbon and the hydrogen can be found by combustion.

The mass of hydrogen can be obtained as follows;

Number of moles of hydrogen =2.7 g/18 g/mol * 2 = 0.302 moles

Now the mass of hydrogen is obtained from;

0.302 moles * 1 g/mol = 0.302 g

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Answer:

1.49X10^20

Explanation:

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neutralization reaction = acid+base = salt + water

molecular equation = balanced equation

2HI(aq) + Ba(OH)₂(aq) ⇒ BaI₂(aq) + 2H₂O(l)

Answer:

Explanation:

Food wrappers and aluminium wrappers are widely use for packing various eatable items.

For example, in our homes our mother wraps our food for lunch in aluminium foil.

As it helps in keeping the food warm for hours.

Thus, we can conclude that out of the given options, a packaging waste is the garbage collector collecting.

This chapter deals with chemical equilibrium, or how far chemical reactions proceed. Some reactions convert reactants to products with near 100% efficiency but others do not.

Chemical equilibrium is a dynamic process and occurs when the rates of two opposing processes (reactions) become the same. Unless conditions are somehow changed, the concentrations of both reactants and products remain constant after equilibrium is achieved.

Consider the decomposition reaction in which N2O4 (g) ' 2 NO2(g) What happens to the concentration of each, based upon the rate equations, as the reaction proceeds

Assuming reversible elementary processes, Rate (forward) = k (forward) x [N2O4]  and rate (reverse) = k (reverse) x [NO2]2As [N2O4] decreases, rate forward decreases, and, as [NO2] increases, rate reverse increases, but more quickly.

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The Answer to the question is 14 grams approximately.

Atomic mass of Na = 23 u

Given mass of Na = 3.4 gm

Moles of Na = given mass of Na / molar mass of Na

Moles of Na = 3.4 / 23 moles = 0.15 moles approximately

So, 0.15 moles of Na approximately

Molar mass of Cl₂ = 35.45 × 2 = 70.9  u

Given mass of Cl₂ = 8.9 gm

Moles of Cl₂ = given mass of Cl₂ / molar mass of Cl₂

Moles of Cl₂ = 8.9 / 70.9 moles = 0.12 moles approximately

So, 0.12 moles of Cl₂ approximately

Balanced chemical equation

2Na   +     Cl₂ → 2NaCl

Ratio of Moles to Stoichiometric coefficients

0.15/2     0.12/1  

0.075  <  0.12

So, as ratio of Na is less then it will be our Limiting reagent.

Which means that Cl₂ will consume complete in the reaction.

It is clear from the reaction that 1 moles of Cl₂ are making 2 mole of NaCl

1 moles of Cl₂ → 2 mole of NaCl

0.12 moles of Cl₂ → 2 × 0.12 mole of NaCl

0.12 moles of Cl₂ → 0.24 mole of NaCl

So, 0.12 moles of Cl₂ will make 0.24 mole of NaCl

0.24 mole NaCl = mass formed NaCl / molar mass of NaCl

mass formed NaCl = 0.24 × molar mass of NaCl

mass formed NaCl = 0.24 × 58.44

mass formed NaCl = 0.24 × 58.44

mass formed NaCl = 14 grams    (approximately)

14 grams of NaCl will be formed.

So, approximately 14 grams NaCl is formed from 3.4 grams of Na and 8.9 grams of Cl.

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[tex]\\ \tt\leadsto -log[H^+]=5.31[/tex]

[tex]\\ \tt\leadsto log[H^+]=-5.31[/tex]

[tex]\\ \tt\leadsto [H^+]=antilog(-5.31)[/tex]

[tex]\\ \tt\leadsto [H^+]=4.89\times 10^{-6}M[/tex]

According to Boyle's law of gases, the volume  of the gas will decrease when increasing the pressure of the gas in the syringe by adding weights above the syringe.

Boyle's law of gases states that the pressure of a given mass of gas is inversely proportional to the volume of the gas.

In the given, increasing the pressure of the gas in the syringe by adding weights above the syringe will result in a decrease in the volume of the gas.

On the other hand, decreasing the pressure will result in an increase in the volume of the gas.

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Answer:

1. 3.498

2. 1.37

3. 37.5

4. 51.4

Explanation:

The given reaction is a double replacement reaction; option B.

A chemical reaction is a reaction in which chemical changes occurs in the atoms of reactants which results in the formation pf products.

The given reaction is as follows:

Since exchange of ions occur, it is a double replacement reaction.

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The main combustible part of wood is cellulose, a compound of carbon, hydrogen, and oxygen, which, when it burns, breaks down to carbon dioxide, water, and heat.

The substances which catches fires easily in air and produce heat and light upon burning is known as Combustible Substances.

Example: Wood, Oil, Kerosene, Hydrogen gas, Cloth etc.

When these compounds carbon, hydrogen and oxygen burns completely the carbon oxidizes to carbon dioxide , water and heat.

Thus from the above conclusion we can say that The main combustible part of wood is cellulose, a compound of carbon, hydrogen, and oxygen, which, when it burns, breaks down to carbon dioxide, water, and heat.

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Answer:

Explanation:

In order to balance equations, simply alter coefficients until all elements are equal on both sides of the reaction symbol ”—>”:

1HBr + 1KOH —> 1KBr + 1H2O

The reaction is already balanced

3HF + Fe(OH)3 —> FeF3 + 3H2O

To match the 3 Flluorines on the right hand side, add 3 to HF and then add 3 to H2O to compensate for the increase in hydrogens.

2HCl + Ca(OH)2 —> CaCl2 + 2H2O

The Chlorine must be balanced, and then hydrogen must be balanced.

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The density = 1.77 x [tex]10^{-2}[/tex] where Mass =4.7033 x [tex]10^4[/tex] g and Volume=2.6540 x [tex]10^6[/tex]mL.

What is density?

Density is the measurement of how tightly a material is packed together. It is defined as the mass per unit volume. Density Symbol: D or ρ Density Formula: ρ = m/V, where ρ is the density, m is the mass of the object and V is the volume of the object.

Given:

Density = (4.7033 x [tex]10^4[/tex] g/ 2.6540 x [tex]10^6[/tex] mL)

Mass =4.7033 x [tex]10^4[/tex] g

Volume=2.6540 x[tex]10^6[/tex] mL

Density = (4.7033 x [tex]10^4[/tex] g/ 2.6540 x [tex]10^6[/tex] mL)

Density = 1.772155237 x [tex]10^{-2}[/tex] = 1.77 x [tex]10^{-2}[/tex]

Hence, the density = 1.77 x [tex]10^{-2}[/tex].

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When electrons in an atom transition from a lower energy state to a higher energy state it has to absorb some energy in order to transition to the higher energy state.

When properly stimulated, the electrons in these materials move from lower energy levels to higher energy levels and occupy different orbits. Then, at some point, these high-energy electrons emit "extra" energy in the form of photons and return to their original energy levels.

Electrons jump to higher energy levels when excited by external energy gains such as B. Large heating, the presence of an electric field, or collision with another electron.

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Answer:

Most fire extinguishers work by separating the fuel from the oxygen. The oxygen comes from the air. It is the same oxygen we breathe. Since the oxygen has to be in contact with the fuel, if you can coat the fuel with something that keeps the oxygen away, the fire will go out. Some ways of using fire extinguisher are:

Explanation:

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Answer:

Explanation:

I'm assume that 3 Br2 + 6 OH¹-5 Br¹ + BrO3¹ + 3 H₂O is meant to read:

3 Br2 + 6 OH^-1    =   5 Br^-¹ + BrO3^-¹ + 3 H₂O

The balanced equation tells us that 3 moles of Br2 will react with 6 moles of OH^-1 to produce 5 moles of Br^-1.

The first step is to determine whether the Br2 or OH^-1 are limiting reagents.  That is, is there enough of each to complete the reaction, with none left over.

We need 3 moles of Br2 for every 6 moles of OH^-1, a molar ratio of 1/2 (Br2/OH).

We are given 4.68 moles of Br2 and 8.12 moles of OH^-1.  That is a ratio of 4.68/8.12 or 0.5764.  This is higher than the ratio of 1/2 or 0.5 that is required.  That means we have more than enough Br2.  The limiting reagent is the OH^-1.  Once it is consumed, the reaction stops and we are left with some unreacted Br2.

So we need the molar ratio of the OH^-1 to the Br from the balanced equation:  We see that 6 moles of OH^-1 are required to produce 5 moles of Br, a 6/5 molar ratio.

Therefore, we may assume all 8.12 moles of the limiting reagent, OH^-1, will be consumed to produce *6/5) that amount of Br.

(8.12 moles OH^-1)*((6 moles Br)/(5 moles OH^-1)) = 9.75 moles of Br.

For curiosity's sake, we can determine the amount of unreacted Br2.  8.12 moles of OH^-1 would require (8.12 moles OH)*(1/2) = 4.06 moles of Br2.

4.68 moles starting Br2

4.06 moles consumed

0.62 moles remaining Br2

Answer:

option c

Explanation:

They are fast-moving particles that can penetrate the skin.

This refers to the material that is made when different substances mix up physically and causes a reaction.

You can make on the project of Mixture -

This refers to the chemical bond that holds different atoms tightly

You can make on the project of Compound -

Based on the fact that the atom is the smallest indivisible part of an element, elements like phosphorous cannot be further broken down.

You can make on the project of Elements -

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Answer:

discuss the successes and the short comings of the conservative reaction to the french rvolution as seen in the actions of the congress of vienna and the holy aliance?

To be effective, collisions between atoms must occur with the proper orientation and also the proper amount of energy.

An inelastic collision is a collision in which there is a loss of kinetic energy. While the momentum of the system is conserved in an inelastic collision, the kinetic energy is not. This is because some kinetic energy has been transferred to something else.

In this case, is necessary have energy to be effective, so collisions between atoms must occur with the proper orientation.

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Answer:

energy

Explanation:

Heat produced is given by -0.813 kJ

Calculation of heat produced:

The reaction:

[tex]3NaOH + H_3PO_4 \rightarrow Na_3PO_4 + H_2O[/tex]     ΔH[tex]_{rxn}[/tex]= -173.7 kJ (Assumed)

Step 1: Calculation of moles using Molarity.

Volume of NaOH= 31.2 mL

Concentration= 0.45M

[tex]M=\frac{n}{V}\times1000\\\\n=\frac{M\times V}{1000} \\\\n= \frac{31.2\times0.45}{1000}\\n= 0.01404[/tex]of NaOH

Volume of [tex]H_3PO_4[/tex] = 65.4 mL

Concentration= 0.088M

[tex]n=\frac{0.088\times 65.4}{1000}\\\\n= 0.005755[/tex] mole of [tex]H_3PO_4[/tex]

Step 2: Limiting reagent

According to the above reaction

1 mole of [tex]H_3PO_4[/tex] reacts with 3 mole of NaOH

0.005755 moles will react with [tex]3\times 0.005775 \, NaOH[/tex]= 0.017 moles of NaOH is required. But we have 0.01404 moles of NaOH.

So NaOH is the limiting reagent.

Step3: Calculate ΔH:

We will limiting reagent to calculate the heat produced-

[tex]0.01404 \,mole \times\frac{-173.7}{3}= -0.813\, kJ[/tex]

Heat produced= -0.813 kJ

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Explanation:

The transition metals have the following physical properties in common:

they are good conductors of heat and electricity

they can be hammered or bent into shape easily

they have high melting points (but mercury is a liquid at room temperature)

they are usually hard and tough

they have high densities

The transition metals have the following chemical properties in common:

they are less reactive than alkali metals such as sodium

they form coloured ions of different charges

some are very unreactive (silver and gold)

many are used as catalysts

Answer:

The answer is A

Explanation:

Answer:

4170 j

Explanation:

water has low melting point

Butane is a gaseous molecule which is part of the organic compounds called  hydrocarbon,

Butane is a gaseous molecule which is generally called a hydrocarbon.

Hydrocarbons are composed of only carbon and hydrogen. They are of organic origin.

Butane is a low molecular weight hydrocarbon which is used as a fuel.

In conclusion, butane is a gaseous hydrocarbon,

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I2 (s) has very low solubility in H2O (l) because the weak dipole-induced dipole forces between I2 and H2O are not strong enough to replace the hydrogen bonds between the H2O molecules.

Dipole interactions are susceptible interactions that get up from the close association of permanent or precipitated dipoles. Collectively these forces are called Van der Waals interactions. Proteins incorporate a massive number of these interactions, which vary substantially in energy.

Solubility depends on the solvent's capacity to overcome the intermolecular forces in a solid. Red blood cells have an excessive concentration of dissolved ions. When positioned into pure water they rupture.

Polar species are soluble in water, whilst nonpolar species are soluble in oils and fats. Covalent solubility uses the like dissolves like a rule. This means that materials with an equal form of polarity might be soluble in one another. moreover, compounds with differing polarities might be insoluble in one another.

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A solution containing 1 mol of a strong electrolyte will have a greater effect on the colligative properties of the solution than 1 mol of a nonelectrolyte. A strong electrolyte will dissociate or ionize in an aqueous solution, and therefore the total number of dissolved solute particles is greater for 1 mol of a strong electrolyte than for 1 mol of a nonelectrolyte solute.

An electrolyte is a material that separates into charged ions when it is in contact with water. Cations are positively charged ions. Anions are ions that are negatively charged. A substance that may conduct an electric current when melted or dissolved in water is known as an electrolyte.

A substance is referred to as a strong electrolyte if the physical or chemical process that produces the ions is virtually 100% effective (all of the dissolved molecules give ions). Weak electrolytes are those in which only a very small portion of the dissolved substance goes through the ion-producing process.

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