Steve and Meg are doing an experiment where they need to make 37 grams of Fe2O3. How many grams of Fe would they need ?

Answers

Answer 1

Answer:

25.9g

Explanation:

Molecular mass of Fe₂O₃ = (56 * 2) + (16 * 3)

                                          = 112 + 48 = 160

Let's follow the unitary method now

In 160g Fe₂O₃ , there is 112 g Fe

In 1 g  Fe₂O₃ , there is 112 / 160 g Fe

In 37  Fe₂O₃ , we need 112 * 37 / 160

= 25.9 g Fe


Related Questions

Why does the N2 molecule in this room have a greater average velocity
than the O2 molecules in the same room?

Answers

Answer:

Explanation:

The temperature will only move the average velocity of all the molecules in the room. There is a limitation. The O2 molecules are heavier than the N2 molecules. The lighter the molecules, the faster they are going to move on average.

An alkaline earth hydroxide, M(OH)2, was taken to lab for analysis. The unknown powder was poured into a flask and swirled in room temperature DI water until a saturated solution formed. This solution was then slowly filtered to remove the undissolved solid hydroxide. 28.5 mL of this saturated solution was titrated with 0.173 M HCl (aq). Endpoint required 25.10 mL of the HCl (aq) solution. Calculate the Ksp for this alkaline earth hydroxide.

Answers

Answer:

1.77 * 10^-3

Explanation:

From the titration formula;

Let

CA = concentration of acid

CB = concentration of base

VA = volume of acid

VB = volume of base

NA = number of moles of acid

NB = number of moles of base

The equation of the reaction is;

M(OH)2(aq) + 2HCl(aq) -------> MCl2(aq) + 2H2O(l)

So;

CAVA/CBVB= NA/NB

CAVANB = CBVBNA

CB= CAVANB/VBNA

CB= 0.173 * 25.10 * 1/28.5 * 2

CB= 4.3423/57

CB= 0.0762 M

This implies that the solubility of M(OH)2 = 0.0762 M

M(OH)2(s) ----> M^+(aq) + 2OH^-(aq)

So

Ksp = x * (2x)^2

Ksp = 4x^3

x = 0.0762

Ksp= 4(0.0762)^3

Ksp = 1.77 * 10^-3

Water is an essential molecule to life on Earth. Which of the following is not a property of water that is critical to biological life?

1. surface tension
2. density
3. temperature
4. viscosity

Answers

I believe it will be A. Density, temperature, and viscosity, can be found in water through tests. Hope this helps! Mark as brainly please!

The property of water that is not critical to biological life is surface tension.

What is biological life?

Biological life means the life in which living organism do exist and for their survival they mainly depends on water and air.

The main critical properties that water should posses to biological life are density, temperature, cohesive force and adhesive force. Viscosity is also understand by the cohesive force because more attraction between atoms more viscous they are.

Hence option (1) is correct i.e. surface tension.

To know more about surface tension, visit the below link:
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Imagine the following scenario involving marbles as "radioactive isotopes".

Let's say the half-life of green marbles is 1 million years.

In one hand, you're holding 2 green marbles. In your other hand, you're holding 500,000 green marbles.

Hypothetically, noting that we have two different starting amounts of "isotopes", how long will it take for half of each amount to decay?

Answers

Answer:

1 million years

Explanation:

The half life of a radioactive isotope refers to the time it takes for the radioactive isotope to decay to half of its original amount.

The half life of a radioactive isotope is independent of the amount of starting material. Hence, whether the amount of starting material is small or large, the half life of the substance remains the same.

Hence the half life of 2 green marbles and 500,000 green marbles is 1 million years.

Question - Complete and balance the following chemical equations:



C8H18 + O2 --->

When you complete and balance the specific equation, give the following information:

State which type of chemical reaction this is.
Explain how you know which type of chemical reaction it is.
List the amount of each element you have when the equation is unbalanced. E.g. there is one mole of calcium on the reactants side.
Give the balanced chemical equation.
List the amount of each element you have when the equation is balanced.
The order of the elements that you balanced the equation with.
Explain how you know which coefficient to use for the specific compound.


Your Answer:

Answers

Answer:

2C8H18 + 25O2 -> 16CO2 + 18H2O

(16C, 36H, 50O)

H2O requires 2H per H2O, Meaning that you'd have 9H2O's from 1C8H18, but you still need that O2 for the CO2 and because the reactant side has 8C (within C8H18) You'd have to times the amount of required O2 from CO2 by 8. Even then you still don't have enough for both CO2 and H2O so you'll have to multiply MORE causing a bigger chain reaction resulting in 2C8H18 + 25O2 -> 16CO2 + 18H2O


What is TRUE about the majority of explosives that forensic scientists deal with in investigations?
А.
They are made of dynamite and TNT.
B.
They are Molotov cocktails.
C. They use high explosives.
D.
They are homemade bombs.

Answers

Answer:D

Explanation:

The majority of explosives that forensic scientists deal with in investigations are homemade bombs. Therefore, option D is correct.

What are forensic scientist ?

In general, forensic scientists do the following kinds of work: They examine tangible materials gathered from crime sites. They offer forensic expert testimony both before and during court proceedings. Blood, hair, and other trace evidence are gathered by investigators and sent to crime labs for analysis.

Criminalists or crime scene investigators are generalist forensic science technicians that gather evidence at the scene of a crime and conduct scientific and technical examination in labs or offices.

A forensic scientist's key responsibilities include gathering evidence at the crime scene, documenting the findings in reports, processing the evidence at the lab, and giving testimony in court.

Thus, option D is correct.

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please answer asap!

What is the molarity of a KOH solution if 200 ml of the solution contains 0.6 moles KOH?

a. 0.3 M
b. 0.6 M
c. 3.0 M
d. 6.0 M

Answers

200 ml is 1/5 of a liter, so the answer is five times the number of moles present in the solution. 0.6 moles/0.2 liter = x moles/1.0 liter. Solving for x gives 0.2 x = 0.6 or x = 3.0 M

so the answer is c

In another experiment, the student titrated 50.0 mL of 0.100 M HC,H,O, with
0.100 M NaOH(aq). Calculate the pH of the solution at the equivalence point

Answers

Answer:

Eqv Pt pH = 8.73

Explanation:

    HOAc                   +            NaOH            =>            NaOAc              + H₂O

50ml(0.10M HOAc)  +  50ml(0.10M NaOH) => 100ml(0.05M NaOAc) + H₂O

For neutralized system, 100ml of 0.05M NaOAc remains

NaOAc => Na⁺ + OAc⁻

Na⁺ + H₂O => No Rxn

          OAc⁻  +  H₂O  => HOAc + OH⁻

C(i)   0.05M       -----        0M      0M

ΔC        -x           -----         +x        +x

C(f)    0.05-x      

       ≅ 0.05M    -----          x          x

Kb = Kw/Ka = [HOAc][OH⁻]/[OAc⁻] = 1 X 10⁻¹⁴/1.7 X 10⁻⁵ = (x)(x)/(0.05M)

=> x = [OH⁻] = SqrRt(0.05 x 10⁻¹⁴/1.7 x 10⁻⁵) = 5.42 x 10⁻⁶M

=> pOH = -log[OH⁻] = -log(5.42 x 10⁻⁶) = 5.27

pH + pOH = 14 => pH = 14 - pOH = 14 - 5.27 = 8.73 Eqv Pt pH

Addition of sugar to water will result in increase of boiling point
TRUE OR FALSE

Answers

Answer:

true

Explanation:

true. i think. :) sorry if i’m wrong, i’m not the brightest.

keeping a bike indoor will stop it rusting true or false​

Answers

Answer: True because if you leave it outside and it rains on the bike it will cause rust. Keep it in the garage or something. :) I have a bike btw.

Explanation:

The best way to prevent rusting is to store your bike safely away when it isn't being used and apply a rust-proofing lubricant to protect it when you are riding it – enjoying those wet and wild rides guilt-free!

so true

3. Are the gates working and can be easily opened in case of
emergency?

Answers

Answer:

Yes, I think.

Explanation:

You cannot make an emergency door if you cannot open it easily. So if there is an emergency you need to be able to go threw it fast. So if there is a fire and you needed to just get out of there through the emergency door, just open it and you can get out.

The gates of an emergency exit must be easily opened in case of an emergency to let people out of the building.

It is required that building ought to have an emergency exit. The emergency exit is a door that can easily be opened so that people can leave via that door.

Hence, the gates of an emergency exit must be easily opened in case of an emergency to let people out of the building.

Learn more about emergency exit: https://brainly.com/question/4206267

What is the fundamental different between combustion and nuclear reaction

Answers

Answer:

Nuclear reactions involve a change in an atom's nucleus, usually producing a different element. Chemical reactions, on the other hand, involve only a rearrangement of electrons and do not involve changes in the nuclear.

Can someone please help me, i just need help =(

Answers

Answer:

The answers to your questions are given below

Explanation:

F. Determination of the missing part of the equation.

_ I₂ + _Na₂S₂O₃ —> _ NaI + _ Na₂S₄O₆

The above equation can be balance as illustrated below:

I₂ + Na₂S₂O₃ —> NaI + Na₂S₄O₆

There are 2 atoms of I on the left side and 1 on the right side. It can be balance by writing 2 before NaI as shown below:

I₂ + Na₂S₂O₃ —> 2NaI + Na₂S₄O₆

There are 2 atoms of Na on the left side and a total of 4 atoms on the right side. It can be balance by writing 2 before Na₂S₂O₃ as shown below:

I₂ + 2Na₂S₂O₃ —> 2NaI + Na₂S₄O₆

Now the equation is balanced.

The coefficients are: 1, 2, 2, 1

Elements >>> Reactant >>> Product

Sodium >>>>> 4 >>>>>>>>> 4

Sulphur >>>>> 4 >>>>>>>>> 4

Oxygen >>>>> 6 >>>>>>>>> 6

Iodine >>>>>> 2 >>>>>>>>>> 2

G. Determination of the missing part of the equation.

__ Mg + __P₄ —> __Mg₃P₂

The above equation can be balance as illustrated below:

Mg + P₄ —> Mg₃P₂

There are 2 atoms of P on the right side and 4 atoms on the left side. It can be balance by writing 2 before Mg₃P₂ as shown below:

Mg + P₄ —> 2Mg₃P₂

There are 6 atoms of Mg on the right side and 1 atom on the left side. It can be balance by writing 6 before Mg as shown below:

6Mg + P₄ —> 2Mg₃P₂

Now the equation is balanced.

The coefficients are: 6, 1, 2

Elements >>>> Reactant >>> Product

Magnesium >> 6 >>>>>>>>> 6

Phosphorus >> 4 >>>>>>>>> 4

What determines the degree of polarity in a bond?

Answers

Answer:

The relative electronegativity of the two bonded atoms determines the polarity of a bond. If the difference in electronegativities between the two atoms is less than 0.4, the bond is nonpolar covalent. ... If the difference in electronegativities between the two atoms is more than 2.0, the bond is ionic.

Pure gold has a density of 19.3 g/cm³. if it is made into a crown. what will be the density of the crown? how can you find out if the crown is indeed made of pure gold and nothing else?​

Answers

Answer:

19.3g cm^3

If it deviates from the original 19.3g cm^3

What is an ionic solid?​

Answers

Ionic solids—Made up of positive and negative ions and held together by electrostatic attractions. They're characterized by very high melting points and brittleness and are poor conductors in the solid state. An example of an ionic solid is table salt, NaCl.

Explanation:

In chemistry, an ionic compound is a chemical compound composed of ions held together by electrostatic forces termed ionic bonding. The compound is neutral overall, but consists of positively charged ions called cations and negatively charged ions called anions.

help me plss plss.plsss.plsssplss plsss.plsss plsss plsss plsss​

Answers

Answer:

1. Distance  = 5 cm

Displacement = 1 cm

2. Distance = 7 cm

Displacement = 1 cm

3. Distance = 5 cm

Displacement = -1 cm

4. Distance  = 6 cm

Displacement = -2 cm

5. Distance  = 4 cm

Displacement = 0 cm

Explanation:

The distance an object travels is a measure of the total ground cobpvered bybthe object without regard to the direction of motion. It is a scalar quantity as it only takes into account magnitude but not the direction of a quantity.

Displacement however, is a measure of how far away or apart an object is from its starting position.  It a vector quantity as it takes into account both the magnitude and direction in its measurement.

From the attachment provided, considering forward direction as positive and reverse as negative :

1. When a object moves from point 1 to point 4 and reverses to point 2.:

Distance  = from 1 to 4 = 3 cm; from 4 back to 2 = 2 cm;  3 + 2 = 5 cm

Displacement = from 1 to 4 = +3 cm; from 4 back to 2 = -2 cm;  3 - 2 = 1 cm

2. When an object moves from point 1 to 5 and reverses to 2:

Distance = from 1 to 5 = 4cm; from 5 back to 2 = 3 cm; 4 + 3 = 7 cm

Displacement = from 1 to 5 = +4 cm; from 5 back to 2 = -4 cm;  4 - 3 = 1 cm

3. When an object moves from point 1 to 3 and then reverses to 0.

Distance  = from 1 to 3 = 2 cm; from 3 back to 0 = 3 cm;  2 + 3 = 5 cm

Displacement = from 1 to 3 = +2 cm; from 3 back to 0 = -3 cm;  2 - 3 = -1 cm

4. When an object moves from point 3 to 5 and then reverses to 1:

Distance  = from 3 to 5 = 2 cm; from 5 back to 1 = 4 cm;  2 + 4 = 6 cm

Displacement = from 3 to 5 = +2 cm; from 5 back to 1 = -4 cm;  2 - 4 = -2 cm

5. When an object moves from point 2 to 4 and then reverses to 3.

Distance  = from 2 to 4 = 2 cm; from 4 back to 2 = 2 cm;  2 + 2 = 4 cm

Displacement = from 2 to 4 = +2 cm; from 4 back to 2 = -2 cm;  2 - 2 = 0 cm

Your friend had an upset stomach caused by indigestion. His mother explained to him
that indigestion is when the contents in the stomach are too acidic. She also told him to
drink soda to settle his stomach. The soda did not help. You tell him that you would not
have expected the soda to help with the indigestion based on what you know about
acids and bases.
ليالي
Baking Soda
Acidic
Neutral
Basic
Explain why soda would not help settle your friend's stomach. In your reponse, be sure
to include:
• a better alternative to drinking soda.
• how each substance above would react with the stomach acid.
• defining characteristics of acids and bases, besides how they react.
Be sure to consider the completeness of your response, supporting details, and accurate
use of terms.

Answers

Answer:

because it may cause burn that causes acid to build up which causes you to keep having an upset stomach

Pls someone help me with this question pls

Answers

The answer should be c because of the answer

Compute the mass of KI needed to prepare 500 mL of a 0.750 M solution.

Answers

Answer:

62 grams

Explanation:

Molarity=mol/liter

We have mL and Molarity

500 mL * 1 L/1000 mL=0.5

Plug 0.5 in and solve for moles

0.75=mol/0.5

0.75*0.5=0.375 mol

Convert to grams by finding the mass of KI: 39+126.9= 165.9 grams

0.375 mol KI * 165.9 grams KI/1 mol KI= 62.2125 grams

The mass of KI needed is 124.5 grams, this can be calculated by adding the values in molarity formula.

What is Molarity?

It is defined as number of moles of solute over volume of solution in liters.

It is given by:

M = n/ V

What information do we have?

Molarity= 0.750 M

Volume = 500 mL= 1 L

Molar mass of KI = 166 g/mol

To find:

Mass of KI=?

On substituting the values:

M= n/V

0.750 M= n/ 1 L

n= 0.750 M* 1l

n= 0.750 moles

Number of moles is the ratio between mass and molar mass.

n= m/M

0.750 moles = m/ 166 g/mol

m= 0.750*166

m= 124.5 grams.

Thus, the mass of KI needed is 124.5 grams.

Find more information about Molarity here:

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oi oi oi oi ewin
.................

Answers

Muy bein me gusta hope this makes you smile

What is the pH of an aqueous solution with a hydrogen ion concentration of [H+]=8.2×10 −7 M?

Answers

Answer:

6.1

Explanation:

From the question given above, the following data were obtained:

Hydrogen ion concentration [H⁺] = 8.2×10¯⁷ M

pH =?

The pH of the solution can be obtained as follow:

pH = –Log [H⁺]

pH = –Log 8.2×10¯⁷

pH = 6.1

Thus, the pH of the solution is 6.1

An alternating current complete 100 cycles in 0.1s. it's frequency is​

Answers

Answer:

The frequency is 1000 cycles/s

Explanation:

An alternating current is an electrical current in which the current changes its magnitude and the sense cyclically. The frequency of this current is defined as the cycles that the current completes in one second.

As the current completes 100 cycles in 0.1 seconds, the frequency is:

100 cycles / 0.1s = 1000 cycles /s

The frequency is 1000 cycles/s

If you are given 96.0 grams of O2, how many grams of H20 are made?

Answers

Answer:

10.66  grams

Explanation:

tiny sacs in the lungs where gas exchange takes place are called ____?

Answers

Answer:

Alveoli

Explanation:

I hope this helps you.

alveoli, where the exchange of oxygen and carbon dioxide actually takes place

If the solubility of sodium chloride is 36 grams per 100 grams of water, which of the following solutions would be considered unsaturated? If the solubility of sodium chloride is 36 grams per 100 grams of water, which of the following solutions would be considered unsaturated? 3.25 moles of NaCl dissolved in 500 ml of water 1.85 moles of NaCl dissolved in 300 ml of water 5.8 moles of NaCl dissolved in 1 L of water none of the above

Answers

Answer: If the solubility of sodium chloride is 36 grams per 100 grams of water then 5.8 moles of NaCl dissolved in 1 L of water solution would be considered unsaturated.

Explanation:

A solution which contains the maximum amount of solute is called a saturated solution. Whereas a solution in which more amount of solute is able to dissolve is called an unsaturated solution.

Now, the number of moles present in 36 g of NaCl (molar mass = 58.4 g/mol) is as follows.

[tex]No. of moles = \frac{mass}{molar mass}\\= \frac{36 g}{58.4 g/mol}\\= 0.616 mol[/tex]

This shows that solubility of sodium chloride is 36 grams per 100 grams of water means a maximum of 0.616 mol of NaCl will dissolve in 100 mL of water.

So, a solution in which number of moles of NaCl are less than 0.616 mol per 100 mL then the solution formed will be an unsaturated solution.

As 5.8 moles of NaCl dissolved in 1 L (or 1000 mL) of water. So, moles present in 100 mL are calculated as follows.

[tex]Moles = \frac{5.8 mol}{1000 mL} \times 100 mL\\= 0.58 mol[/tex]

Moles present in 100 mL of water for 3.25 moles of NaCl dissolved in 500 ml in water are as follows.

[tex]Moles = \frac{3.25 mol}{500 mL} \times 100 mL\\0.65 mol[/tex]

Moles present in 100 mL of water for 1.85 moles of NaCl dissolved in 300 ml of water are as follows.

[tex]Moles = \frac{1.85 mol}{300 mL} \times 100 mL\\= 0.616 mol[/tex]

Thus, we can conclude that if the solubility of sodium chloride is 36 grams per 100 grams of water then 5.8 moles of NaCl dissolved in 1 L of water solution would be considered unsaturated.

what is independent variable

Answers

Answer:

a variable (often denoted by x ) whose variation does not depend on that of another.

Explanation:

You can think of independent and dependent variables in terms of cause and effect: an independent variable is the variable you think is the cause, while a dependent variable is the effect. In an experiment, you manipulate the independent variable and measure the outcome in the dependent variable.For example, someone's age might be an independent variable. Other factors (such as what they eat, how much they go to school, how much television they watch) aren't going to change a person's age.

The diagram shows that the boiling point of water is 100°C At a pressure of one atm.

How could you reduce the boiling point of water in this system?


A. Increase the size of the flame

B. Decrease the volume of the water

C. Decrease the pressure to 0 atm.

D. Increase the pressure to 2 atm

Answers

Answer:

I think the answer will be number A

The boiling point of a substance is constant and for water it is 100 degree celsius. However by reducing the surrounding pressure the boiling point can be reduced.

What is boiling point ?

Boiling point of a substances is the temperature at which the vapor pressure of the gas phase above the liquid equals to the atmospheric pressure where, the liquid converts to the vapor state.

Boiling point depends on the bond type, molar mass, temperature and pressure. As the and pressure increases, boiling point increases. Similarly with an increasing mass and more strength intermolecular force results in greater boiling point.

As the atmospheric pressure decreases, the temperature needed to equalise the vapor pressure of the gas phase over the liquid also decreases. Hence, boiling point decreases. Therefore, option C is correct.

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Help i just need people to answer the question today

Answers

Answer:

1) Hydrogen

2) Methane

3) Carbon

4) Structural isomer

5) Ethene also known as ethylene

6) Hydrocarbons are widely used as fuel

7) Crude oil

Explanation:


1 Write the chemical symbols for following elements: Nitrogen-
Phosphorus- bromine- Zinc-Potassium-Magnesium.

Answers

Answer:

Look below

Explanation:

Nitrogen: N

Phosphorus: P

Bromine: Br

Zinc: Zn

Potassium: K

Magnesium: Mg

Hope this helps(would be very grateful if you mark this answer branliest bc i need for lvl up)

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democracia se basa en la idea de que los siudadanos la capasidad para autogobernarse es decir que todas las personas que integran la_________________pueden ejerser su derecho a debatir e intervenir en asuntos ___________________y a realizar acciones como originarse enme ayudan porfa Please help! Will give brainliest The Big Question In a well-written essay, use at least three of the documents from Part A to answer this question: Did men oppose the early American womens rights movement? 20 points14 The base of a rectangular prism has a length of 15 inches and a width of 13 inches.What is the area of this base of the prism in square inches?Record your answer and fill in the bubbles on your answer document. Be sure to usethe correct place value.195 square inches28 square inches56 square inches what is the equation of the following line? Please help Glorieta pass_______ a. is rugged, difficult place. C. was a toll road b. was located on top of Mesa. d. is located in four corners. Look at the apparatus shown. It can be used to compare the amount of __________ given out by different fuels. What one word completes this sentence? work out 5/9 0f 100. give your answer to nearest whole number (plz help i'll give brainliest to a good and correct answer)Describe how Milady (Lady de Winter) is portrayed in the novel through the eyes of D'Artagnan. Gale owns a car that is worth $9,500 but she still owes $7,400 on the car loan. She has a student loan in the amount of $6,000 and she has a savings account with a balance of $1500. The balance on her credit card is $3200. What is her net worth? What did Queen Elizabeth I do to protect the value of silver coins? A car rental company charges 45.95 per day plus 0.35 per mile Rachel rented a car for two days and was charged 117.10 how many miles did Rachel drive the car 25 miles? 72 miles 117 miles 203 miles help me plzzzzzzzzz :)))) DO NOT ROUND YOUR ANSWER! Answer _________________ m2 List three tasks that fall under the banner of MAM, and define their purpose. You are curious as to whether exposing people to violent video games causes them to be more aggressive. You assign half of your participants to play a violent video game for 5 minutes and the other half to play the same video game for 25 minutes. Afterward, you have them play a board game and have a well-trained research assistant determine whether their playing style is very aggressive, barely aggressive, or not at all aggressive. You find that a vast majority of your participants, regardless of group assignment, are rated as very aggressive. This outcome would be known as a(n) _____. summary for chapter 10 of the refugee Ethan earns $12 per hour for walking Ms. Barns's two dogs, plus an additional $7 for brushing the dogs after their walk. Let x represent the hours Ethan works. Let y represent the total he earns each day.Which number sentence best represents this situation?A. 12 + 7 + 2 = yB. 12x 2 + 7 = yC. 12x + 7 = yD. 12x - 7 = y how does the action of hamlet's mother impact the relationship with Ophelia how many moles are in 1.25 grams of MgCl2?