How many iron atoms are in Fe2O3?

Percent yield = 78.7% , the correct answer is D) 78.7%, which represents the percent yield of NaCl in the reaction.

To calculate the percent yield of NaCl in the given chemical equation, we need to compare the actual yield of NaCl with the theoretical yield. The theoretical yield is the amount of NaCl that would be produced if the reaction went to completion based on stoichiometry.

First, we need to determine the theoretical yield of NaCl. By examining the balanced equation, we can see that the stoichiometric ratio between CuCl2 and NaCl is 1:2. This means that for every 1 mole of CuCl2, 2 moles of NaCl are produced.

Step 1: Convert the mass of CuCl2 to moles using its molar mass.

Molar mass of CuCl2 = 63.55 g/mol (atomic mass of Cu) + 2 × 35.45 g/mol (atomic mass of Cl)

Molar mass of CuCl2 = 134.45 g/mol

Moles of CuCl2 = 31.0 g / 134.45 g/mol ≈ 0.231 mol

Step 2: Use the stoichiometry to calculate the theoretical yield of NaCl.

Since the stoichiometric ratio between CuCl2 and NaCl is 1:2, the moles of NaCl produced will be twice the moles of CuCl2.

Moles of NaCl (theoretical) = 2 × 0.231 mol = 0.462 mol

Step 3: Convert the moles of NaCl to grams using its molar mass.

Molar mass of NaCl = 22.99 g/mol (atomic mass of Na) + 35.45 g/mol (atomic mass of Cl)

Molar mass of NaCl = 58.44 g/mol

Theoretical yield of NaCl = 0.462 mol × 58.44 g/mol ≈ 26.96 g

Now, we can calculate the percent yield using the formula:

Percent yield = (Actual yield / Theoretical yield) × 100

Percent yield = (21.2 g / 26.96 g) × 100 ≈ 78.7%

Option D

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Answer:

Density = mass\ volume

So using this relation we can write volume = mass\density

So volume of uranium = (50.8 \ 18.9 ) cm3

= 2.69 cm3 ( ans)

Answer:

A

Explanation:

i had to answer this question a few weeks ago

Answer:

The atomic theory has changed over time as new technologies have become available. Scientific knowledge builds on past research and experimentation. 400 B.C. Democritus, a philosopher in ancient Greece, began the search for a description of matter.

Explanation:

Answer:

(Ge)

Explanation:

I'm just taking a wild guess really!

If you purchase two new tires instead of four, you should put them on the rear means back side.

If you are here for a short answer on where the two new tires should be installed, always place the new tires on the rear when buying two tires instead of four. This is because more weight of car comes on the back tires so the new tires should be installed on the back tires of the car.

So we can conclude that If you purchase two new tires instead of four, you should put them on the rear means back side.

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Answer:

0.116%

Explanation:

efficiency of sterling engine = 1 - ( 55 + 273 )k / ( 95 + 273 ) k

                                               = 1 - ( 328 / 368 ) = 0.10869

Determine how efficient the transfer of energy via flame is

apply this relation ; energy of steady state / energy output  ---- ( 1 )

where;  energy output = efficiency of sterling engine * energy

                                     = 0.10869 * 50 = 5.4345 J/sec

energy of steady state = 1/2 * I * w^2  ------ ( 2 )

I = moment of inertia of engine = 2 * 10^-5 kgm^2

back to equation 2 :  

energy of steady state = 1/2 * ( 2 * 10^-5 ) * ( 240 * 2π / 60 )^2

                                      = 630.88 * 10^-5  J /sec

Input values into equation 1

= [ (630.88 * 10^-5 )  / 5.4345  ] * 100

= 0.116%

You could identify a physical property of a substance before you performed the activity because the characteristics of a material known as its physical qualities are those that may be investigated independently of the substance's chemical makeup.

This is further explained below.

Generally, Any attribute that can be measured and has a value that can be used to describe the state of a physical system is considered to be a physical property.

In conclusion, The changes that take place in a system's physical attributes may be utilized to provide a description of the transitions that take place between its momentary states.

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Answer:

Chemical Changes are also called Chemical Reactions. Chemical reactions involve combining different substances. The chemical reaction produces a new substance with new and different physical and chemical properties. Matter is never destroyed or created in chemical reactions.

Explanation:

The substance would undergo a phase change from a solid to a gas.

Although it is soluble in water, sodium borohydride interacts with water. Hydrogen gas is created as a reaction byproduct when hydrogen atoms are dissolved in water. Gaseous hydrogen is very flammable.

The powder form of sodium borohydride is white to grey. Water breaks it down into hydrogen, a combustible gas, and sodium hydroxide, a caustic substance.

This process could generate enough heat to ignite the hydrogen. The substance itself ignites quickly and burns intensely once it does.

A white, odorless powder or pellet is sodium borhydride. It serves as a reducing agent for aldehydes and ketones, a blowing agent for polymers, and a bleaching agent for wood pulp.

Therefore, Aldehydes can be preferentially reduced in the presence of other functional groups, such as ketones, esters, imides, and nitriles, due to NaBH4's high reactivity to the carbonyl carbon's positive charge.

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Answer: a computer

Explanation:

The temperature at which this occurred is y/x K

entropy change= x J/K

heat absorbed= y kJ

Entropy= Heat/ Temperature

x= y/ temp

temperature= y/x K

Entropy is a measurable physical characteristic and a scientific notion that is frequently connected to a condition of disorder, unpredictability, or uncertainty.

The amount of heat q needed to heat a substance from 0 K to the temperature of interest must be calculated, and the ratios of q/T must then be added to establish the absolute entropy of the substance at any temperature above 0 K.

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Answer:

I think C But I can't really see it well

The absorbance (A) of a solution related to the transmittance (%T) by the equation A = -log(%T/100) at 400 nm is 0.051.

The absorbance (A) of a solution is related to the transmittance (%T) by the following equation:

A = -log(%T/100)

We are given that the percent transmittance of the solution is 89%, which means that 89% of the incident light is transmitted through the solution, and 11% is absorbed. We can convert this to a decimal fraction by dividing by 100:

%T/100 = 0.89

Substituting this value into the equation for absorbance gives:

A = -log(0.89) = 0.051

Therefore, the absorbance of the solution at 400 nm is 0.051. Note that we did not need to know the concentration of the solution to calculate the absorbance, since %T is a measure of the fraction of incident light transmitted through the solution, which is independent of concentration.

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Complete question is:

Calculate the absorbance of a solution having a % transmittance of 89 at 400nm.

Answer:

Common ratio = 2

Explanation:

The formula for nth term of a geometric progression is given as:

aₙ = arⁿ⁻¹

Given the following values

First term a = 7

r = unknown

n = unknown

Last term = nth term = aₙ =  448

Sum of the terms = 889

Substituting

448 = 7rⁿ⁻¹

Divide both sides by 7

rⁿ⁻¹ = 448/7

rⁿ⁻¹ = 64

Converting 64 to a power

rⁿ⁻¹ = 2⁶

Equating the powers together,

n - 1 = 6

n = 6+1 = 7

Number of terms (n) = 7

Therefore, the common ratio of the geometric progression( r ) = 2

No, the baby was not switched. The blood types of the parents and the baby are consistent with the inheritance patterns of blood types.


Blood type is determined by the presence or absence of certain antigens on the surface of red blood cells. There are four blood types: A, B, AB, and O. The father has blood type AB, which means he has both A and B antigens. The mother has blood type O, which means she has neither A nor B antigens.

Since the baby has blood type B, it means the baby inherited the B antigen from either the mother or the father. Since the father has blood type AB, he can only pass on the A or B antigen to the baby, but not both. Therefore, the baby must have inherited the B antigen from the father.

In conclusion, the baby's blood type is consistent with the blood types of the parents, indicating that there was no mix-up at the hospital. Keep in mind that blood type alone cannot definitively determine biological relationships, but in this case, it supports the parents' biological connection to the baby.

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Answer:

What do you think causes some rock types to have higher densities than others? (Assuming there are no air pockets in the rock, the types of minerals will determine the density. Granite contains lots of quartz and feldspar - both fairly light minerals, whereas basalt and gabbro are made of heavier minerals.)

Explanation:

1) List known values.

sample: 0.600 mol

Pressure: 1.0 atm

Temperature: 15ºC

Constant: 0.082057 L⋅atm⋅K−1⋅mol−1

List unknown values

Volume:

2) Set the equation and solve for V.

3) Converting to proper units.

15ºC + 273.15 = 288.15 K

4) Plug in known values.

n: 0.600 mol

R: 0.082057 L⋅atm⋅K−1⋅mol−1

T: 288.15 K

P: 1.0 atm

The sample will occupy a volume of 14.19 L.

Answer:

0.93 grams per milliliter

Explanation:

Density is the division of mass by volume. It is how "hefty" an object is; for example, wood isn't very "hefty" but metal is. The density is measured in mass over volume, so it is 9.3/10. After applying units, it is 0.93 grams per milliliter.

In Chapter 16, Question 18, the topic being discussed is the concept of delegation in management. Delegation refers to the process of assigning tasks and responsibilities to subordinates while retaining accountability for their successful completion. The question asks the reader to consider why managers may be hesitant to delegate tasks, despite the benefits of doing so.

Managers may be hesitant to delegate tasks for a variety of reasons. One common concern is a fear of losing control over the task or project. They may also worry that the subordinate lacks the necessary skills or knowledge to complete the task successfully. Additionally, some managers may feel that they can complete the task more efficiently themselves, leading them to keep it for themselves rather than delegating it. However, failure to delegate can result in an overwhelming workload for the manager and prevent subordinates from developing valuable skills and experience.

In conclusion, while delegation may be intimidating for some managers, it is an essential aspect of effective management. Delegating tasks and responsibilities can lead to increased productivity, improved morale among subordinates, and the development of valuable skills. By recognizing and addressing their concerns, managers can overcome their hesitations and successfully delegate tasks to their subordinates.

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a. The mean rate of reaction after 15 seconds is 1.03 g/second.

b. After 60 seconds, the reaction has gone to completion.

The rate of reaction is the rate at which product molecules are formed or the rate at which reactant molecules disappear.

The rate of reaction measures the time it takes for 1 mole of reactant to be converted to the product or the time it takes for one mole of product to be formed from reactants.

Mathematically;

The rate of the given reaction is determined as follows:

a. mean rate of reaction after 15 seconds = (13 + 18) / (10 + 20)

mean rate of reaction after 15 seconds = 1.03 g/second

B, the reaction goes to completion when the mass of CO₂ produced remains constant or unchanged.

The mass of CO₂ produced remains constant after 60 seconds.

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A redox reaction is a chemical reaction in which one or more of the reacting species undergoes oxidation and one or more undergoes reduction. An oxidizing agent is an element or compound that oxidizes another substance, while a reducing agent is an element or compound that reduces another substance.

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Answer:

83.82 g of magnesium ions.

Explanation:

We want to determine the mass of magnesium ions in 155.0 grams of magnesium phosphide (Mg₃P₂).

We can convert from grams of Mg₃P₂ to moles of Mg₃P₂, moles of Mg₃P₂ to moles of Mg, and moles of Mg to grams of Mg.

Find the molecular weight (molar mass) of magnesium phosphide:

\(\displaystyle \begin{aligned}\text{MW}_\text{Mg$_3$P$_2$} &= \left(3(24.31)+2(30.97)\right) \text{ g/mol} \\ \\ &= (72.93 + 61.94) \text{ g/mol} \\ \\ &= 134.87 \text{ g/mol}\end{aligned}\)

The molecular weight of magnesium is 24.31 g/mol*.

From the chemical formula, we can see that there are three moles of magnesium for every one mole of magnesium phosphide.

Hence, multiply initial amount with known ratios:

\(\displaystyle \begin{aligned} &155.0 \text{ g Mg$_3$P$_2$} \cdot \frac{1 \text{ mol Mg$_3$P$_2$}}{134.87\text{ g/mol}} \cdot \frac{3\text{ mol [Mg$^{2+}$]}}{1 \text{ mol Mg$_3$P$_2$}}\cdot \frac{24.31 \text{ g [Mg$^{2+}$]}}{1 \text{ mol [Mg$^{2+}$]}}\\ \\ & = 83.82 \text{ g [Mg$^{2+}$]}\end{aligned}\)

In conclusion, there are 83.82 grams of magnesium ions in 155.0 grams of magnesium phosphide.

*Because the magnesium ions in magnesium phosphide have two less electrons, its molecular weight will indeed be lower. However, due to the extremely small size of an electron (1/2000th of a proton), the difference in mass is insignificant.

The molarity of the first solution containing 0.500 mol of NaOH in 2.30 l of the solution is 0.217 M.

The molarity of a solution is defined as the number of moles of solute per liter of solution. In order to calculate the molarity of the given solution, we need to divide the number of moles of solute by the volume of the solution given in liters. Using the formula for molarity, we have;

Molarity = Number of moles of solute / Volume of solution in liters

Given, Number of moles of solute = 0.500 mol

Volume of solution = 2.30 L

Substitute the values of the given information into the molarity formula; Molarity = 0.500 mol / 2.30 L = 0.217 M

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Answer: Copper(I) sulfate, also known as cuprous sulfate and dicopper sulfate, is the chemical compound with the chemical formula Cu2SO4 and a molar mass of 223.15 g mol−1. It is an unstable compound as copper(I) compounds are generally unstable and is more commonly found in the CuSO4 state. It is white in color at room temperature and is water-soluble. Due to the low-stability of the compound there are currently not many applications to date.