How many moles of H2O are in 4.00 L of water?

Answer:

Chlorine is limiting reactant

Explanation:

Based on the reaction:

Cl₂ + 2NaOH → NaClO + NaCl + H₂O

1 mole of chlorine reacts with 2 moles of NaOH

To find limiting reactant, we need to determine the moles of the reactants:

Moles Cl₂ -Molar mass: 70.9g/mol-:

800lb Cl₂ * (453.6g / 1lb) * (1mol / 70.90g) =

5118 moles Cl₂

Moles NaOH -Molar mass: 40g/mol-:

1200lb NaOH * (453.6g / 1lb) * (1mol / 40g) =

13608 moles NaOH

For a complete reaction of 13608 moles of NaOH you need:

13608 moles NaOH * (1mol Cl₂ / 2 moles NaOH) = 6804 moles of Cl₂

As the solution contains just 5118 moles of chlorine,

Answer:

A

Explanation:

When doing an experiment you want the most trials and most controls possible. It is impossible to get good data while testing multiple variables at once.

Answer:

.222 g

Explanation:

FeTiO3(s)+3Cl2(g)+3C(s)   →    CO(g)+FeCl2(s)+TiCl4(g)

TiCl4(g)+2Mg(s)    →   2MgCl2(l)+Ti(s)

1.40 g of mineral  will contain pure ore of .202 x 1.4 g = .2828 g

ilmenite mass = .2828 g of illemnite mass

product after first reaction = .916 x .2828 = .259 g

product after 2 nd reaction = .86 x  .259 g

= .222 g

The mass of titanium that can be obtained from 1.40 kg of the ilmenite-sand mixture is 70.27 g

From the question,

We are to determine the mass of titanium can be obtained from 1.40 kg of the ilmenite-sand mixture

Also from the question, we have that

An ilmenite-sand mixture contains 20.2 % ilmenite by mass

That means,

The mass off ilmenite present in the 1.40 kg ilmenite-sand mixture is

= [tex]\frac{20.2}{100} \times 1.40 \ kg[/tex]

[tex]= \frac{20.2}{100}\times 1400 \ g[/tex]

= 20.2 × 14

= 282.8 g

∴ The mass of ilmenite present in the ilmenite-sand mixture is 282.8 g

From the first reaction

FeTiO₃(s) + 3Cl₂(g) + 3C(s) → 3CO(g) + FeCl₂(s) + TiCl₄(g)

We will calculate the mass of TiCl₄ produced

First, we will determine the number of moles of ilmenite (FeTiO₃) present

From the formula

[tex]Number\ of \ moles = \frac{Mass }{Molar\ mass}[/tex]

Molar mass of ilmenite (FeTiO₃) = 151.71 g/mol

∴ Number of moles of ilmenite = [tex]\frac{282.8}{151.71 }[/tex]

Number of moles of ilmenite = 1.864 moles

From the balanced chemical equation in the first reaction

1 mole of ilmenite (FeTiO₃) reacts to produce 1 mole of TiCl₄

∴ 1.864 moles of ilmenite (FeTiO₃) will produce 1.864 moles of TiCl₄

Now, for the mass of TiCl₄ produced

From the formula

Mass = Number of moles × Molar mass

Molar mass of TiCl₄ = 189.679 g/mol

∴ Mass of TiCl₄ = 1.864 × 189.679

Mass of TiCl₄= 353.561656 g

But, from the question,

The reaction has a yield of 91.6%

∴ Mass of TiCl₄ produced = [tex]\frac{91.6}{100} \times 353.561656[/tex]

Mass of TiCl₄ produced = 0.916 × 353.561656

Mass of TiCl₄ produced = 323.8624 g

From the second reaction

TiCl₄(g) + 2Mg(s) → 2MgCl₂(l) + Ti(s)

We will determine the mass of Titanium (Ti) produced

From the balanced chemical equation for the reaction

1 mole of TiCl₄ reacts to produce 1 mole of Titanium (Ti)

The number of moles of TiCl₄ produced in the first reaction is

= 91.6% × 1.864 moles

= 0.916 × 1.864

= 1.7074242 moles

Since

1 mole of TiCl₄ reacts to produce 1 mole of Titanium (Ti)

∴ 1.707424 moles of TiCl₄ will react to produce 1.707424 moles of Titanium (Ti)

But, from the question

The yield of the second reaction is 86.0%

∴ The number of moles of Titanium (Ti) produced is [tex]\frac{86.0}{100}\times 1.707424[/tex]

Number of moles of Ti produced = 0.86 × 1.707424

Number of moles of Ti produced  = 1.468 moles

Now, we will determine the mass of Titanium (Ti) produced

From the formula

Mass = Number of moles × Molar mass

Molar mass of Titanium = 47.867 g/mol

∴ Mass of Titanium produced = 1.468 × 47.867

Mass of Titanium produced = 70.27 g

Hence, the mass of titanium that can be obtained from 1.40 kg of the ilmenite-sand mixture is 70.27 g

Learn more here: https://brainly.com/question/13543056

Answer:

1is the answer to that one day F

The electronic configuration of lithium is 1 s² 2s¹ as it  has 1 electron in 2 s subshell it is a s-block element.

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.

Learn more about electronic configuration,here:

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Answer :-

Physical change

Nh2o has a trigonal pyramid

Answer:

separating solute particles in the pure solute and separating solvent particles in pure solvent

Explanation:

when we talk about a solution, it means the homogeneous mixture of different substances of two or more.

Enthalpy change of solution is the quantity of heat that is released during the process of dissolving.

If solute molecules have been broken from the intermolecular forces that bind them and also solvent molecules have been broken from the intermolecular forces binding them, then we have an endothermic process.

so the answer is:

separating solute particles in the pure solute and separating solvent particles in pure solvent

Answer:  

Greenhouse gas Chemical formula Global Warming Potential, 100-year time horizon

Carbon Dioxide

Methane

Nitrous Oxide

Chlorofluorocarbon

Explanation:

Answer:

Explanation:

The pH of a solution given it's hydrogen ion concentration can be found by using the formula

where

[tex]{H }^{ + }[/tex] is the hydrogen ion concentration

From the question

[tex]{H }^{ + }[/tex] = [tex]{9.2 × 10 }^{ - 6}[/tex] M

The pH of the solution is

[tex]pH = - log(9.2 \times {10}^{ - 6} ) \\ = 5.03621217...[/tex]

We have the final answer as

Hope this helps you

Answer:

The volume of the jar needed in order to hold enough oxygen for complete combustion is 24.2 L

(a) C₂H₅OH  + 2O₂ -------> 2CO₂ + 3H₂O

(b)  The moles of oxygen needed to completely combust the ethanol is      0.0429 moles

(c) The Partial pressure of oxygen is 4346.84 Pa

(d) the volume of oxygen (in L) needed in the jar is 1.038 L

Explanation:

Given;

volume of ethanol, V = 1.25 mL

density of ethanol, ρ = 0.789 g/mL

mass of ethanol, m = ρV = (1.25 mL) x (0.789 g/mL) = 0.986g

The volume of the dry air is calculated as;

[tex]P_d = \rho _d R_d T\\\\P_d = (\frac{M_d}{V_d} )R_d T\\\\V_d = (\frac{M_d}{P_d} )R_d T\\\\V_d = (\frac{0.02897 \ (kg)}{101325 \ (Pa)} )*287 \ (J/K.kg)* 295\ (K)\\\\V_d = 0.0242 \ m^3\\\\V_d = 24.2 \ L[/tex]

(a) a balanced chemical reaction for the combustion of ethanol

C₂H₅OH  + 2O₂ -------> 2CO₂ + 3H₂O

(b) The moles of oxygen needed to completely combust the ethanol.

[tex]=0.986 g \ C_2H_5OH *(\frac{1 \ mol \ C_2H_5OH}{46g \ C_2H_5OH} )*(\frac{2 \ Mol \ O_2}{1 \ mol \ C_2H_5OH} )\\\\ = 0.0429 \ mols.[/tex]

(c) the partial pressure of oxygen in the jar

Total pressure of air in the jar, Pt = 101,325 Pa

Partial pressure of oxygen = nPt

                                            = 0.0429 x 101,325 Pa = 4346.84 Pa

(d) the volume of oxygen (in L) needed in the jar

Total volume of air in the jar = 24.2 L

The fraction of this volume by oxygen = 0.0429 mols x 24.2 L = 1.038 L

Dry air is composed of many molecules and compounds. The major quantity of molecules present in the dry air is Nitrogen, followed by oxygen, argon, carbon dioxide and many more. Dry air also has some amount of water vapor in it.

The volume of the jar needed to hold enough oxygen for complete combustion can be calculated by:

= density × volume

= 1.25 ml x 0.789 g/ml

= 0.986 g

The volume of the dry air is calculated by the following:

[tex]\text{P}_d &= \rho_d \text{R}_d \text{T}[/tex]

[tex]\text{P}_d &= \dfrac{{\text M}_d}{\text{V}_d}} \text{R}_d \text{T}[/tex]

[tex]\text{V}_d &= \dfrac{{\text M}_d}{\text{V}_d}} \text{R}_d \text{T}[/tex]

[tex]\text{V}_d &= 0.0242\; m^{3}[/tex]

[tex]\text{V}_d &= 24.2\;\text L[/tex]

Hence, the volume of the dry air is 24.2 L.

a. Balanced chemical equation for the combustion of ethanol can be written as:

C₂H₅OH + 2 O₂ -------> 2 CO₂ + 3H₂O

One molecule of ethanol reacts with two molecules of oxygen to produce two molecules of carbon dioxide and three water molecules.

b. To calculate the moles of oxygen needed for complete combustion of ethanol can be calculated as:

[tex]\begin{aligned}&=0.986g\;\text{C}_2\text{H}_5\text{OH}\times\left(\frac{1\;\text{mol}\;\text{C}_2\text{H}_5\text{OH}}{46\;g\;\text{C}_2\text{H}_5\text{OH}} \right )\times\left(\frac{2\;\text{Mol\;O}_2}{1\;\text{mol}\text{C}_2\text{H}_5\text{OH}} \right )\\&=0.0429\text{mols} \end{aligned}[/tex]

Hence, 0.0429 moles of oxygen will be needed to completely burn ethanol.

c. The partial pressure of the oxygen in the jar can be calculated by the following formula:

Given,

= nPt

= 0.0429 x 101,325 Pa

= 4346.84 Pa

Hence, the partial pressure of oxygen will be 4346.84 Pa.

d.  The volume of oxygen (in L) needed in the jar can be calculated using the volume of the jar.

= 0.0429 moles x 24.2 L

= 1.038 L

Therefore, the volume of the jar needed to hold enough oxygen for complete combustion is 24.2 L.

To learn more about combustion reaction follow the given link:

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Answer:

Explanation:

Given information:

A designed dialysis unit consists of a large no of small hollow fibers,

Considering the one fiber,

By  using the volume of blood, we have :

[tex]V =\dfrac{\pi}{4}\times D^2 \times L[/tex]

where:

L = 30cm = (30× 10) mm = 300 mm

Volume = 80 ml = 80 × 10³ mm

From the above equation, making D the subject, we have:

[tex]4 V ={\pi}\times D^2 \times L[/tex]

[tex]D^2 =\dfrac{4 V }{{\pi}\times L}[/tex]

[tex]D^2 =\dfrac{4 \times 80 \times 10^3 }{ \pi \times 300}[/tex]

D² = 339.53

[tex]D = \sqrt{339.53}[/tex]

D = 18.43 mm

D = 1.843 cm

However, suppose we consider the laminar flow, the pressure loss in a single fiber can be determined as follows:

[tex]\Delta p = \rho g h_f= \dfrac{32* \mu *\overline u*l }{D^2}[/tex]

where;

[tex]\overline u = \dfrac{4 \times 50 \times 10^3}{\pi \times (18.43)^2}[/tex]

[tex]\overline u = \dfrac{200000}{1067.088755}[/tex]

[tex]\overline u =187.43 \ mm/sec[/tex]

[tex]\overline u =18.743 \ cm/sec[/tex]

Recall:

[tex]\Delta p = \dfrac{32* \mu *\overline u*l }{D^2}[/tex]

[tex]\Delta p = \dfrac{32* 3.5 \times 10^{-2} *18.743*30 }{1.843^2}[/tex]

[tex]\Delta p = \dfrac{629.7648 }{3.396649}[/tex]

[tex]\Delta p =185.41 \ dyne/cm^2[/tex]

Finally, the number of needed to be used = [tex]\dfrac{p}{\Delta p}[/tex]

= [tex]\dfrac{10^5 \ dyne /cm^2}{185.41\ dyne /cm^2}[/tex]

= 539.35

Answer: it will take 24.6467 min to lower the radon concentration to an acceptable level of 0.15Bq.L^-1

Explanation:

To calculate the required time, we make use of the formula

Cout = Coexp [ - ( 1/θ  + k ) t ] .........lets call this equation 1

where Co is the concentration of radon( 1.5Bq.L^-1 ), Cout id the allowable radon concentration( 0.15Bq.L^-1), k is the radon decay rate constant( 2.09 * 10^-6 s^-1 ), θ is the theoretical detention time and t is the time required to lower the radon concentration.

first we find θ  which is the theoretical detention time using the expression

θ   = _V / Q

_V is the volume of basement (90 m^3) and Q is the rate of free air (0.14 m^3.s^-1)

so we substitute

θ = 90 / 0.14

θ = 642.857 s

Now we substitute all our values into equation 1

Cout = Coexp [ - ( 1/θ  + k ) t ]

0.15 = 1.5exp [ - ( 1/642.857  + (2.09 * 10^-6) ) t ]

divide both LHS and RHS by 1.5

0.15/1.5  = exp [ - ( 0.001555 + 0.00000209)t ]

0.1 = exp[ - ( 0.001557)t ]

next we take the natural log of both sides

In 0.1 = In [ exp( -0.001557t )]

-2.3025 = - 0.001557t

t = 2.3025 / 0.001557

t = 1478.8053 sec

so we convert to minutes

t = 1478.8053 / 60

t = 24.6467 min

therefore it will take 24.6467 min to lower the radon concentration to an acceptable level of 0.15Bq.L^-1

A nutrient is a substance used by an organism to survive, grow, and reproduce. The requirement for dietary nutrient intake applies to animals, plants, fungi, and protists. Nutrients can be incorporated into cells for metabolic purposes or excreted by cells to create non-cellular structures, such as hair, scales, feathers, or exoskeletons. Some nutrients can be metabolically converted to smaller molecules in the process of releasing energy, such as for carbohydrates, lipids, proteins, and fermentation products (ethanol or vinegar), leading to end-products of water and carbon dioxide. All organisms require water. Essential nutrients for animals are the energy sources, some of the amino acids that are combined to create proteins, a subset of fatty acids, vitamins and certain minerals. Plants require more diverse minerals absorbed through roots, plus carbon dioxide and oxygen absorbed through leaves. Fungi live on dead or living organic matter and meet nutrient needs from their host.

Answer:

The forensic laboratory system in the United States consists of private and public labs. One well-known public lab is the FBI (the Federal Bureau of Investigation) Public labs are mostly run by police officers and state employees, while private labs are organized as a fee-for-service and they are small with a few large and medium=sized operations.

Explanation:

Idk and it's not even 100 points but I hope this helps.

Answer:

B) A low pH and a high pOH.

Explanation:

Took the quiz.

Answer:

Explanation:

To make oxygen in the laboratory, hydrogen peroxide is poured into a conical flask containing some manganese(IV) oxide. The gas produced is collected in an upside-down gas jar filled with water. As the oxygen collects in the top of the gas jar, it pushes the water out.

Answer:

D. P, Potassium

Explanation:

Potassium on the periodic table is actually K

Answer:

2) is an inference

Answer:

Explanation:

This question is a practical question that needs to be practiced in a lab. However, the guide below will assist in answering the question.

Let's assume our unknown metals are X, Y and Z. The unknown metals will be weighed using a weight boat on an electronic balance. Hence, the mass of the weight boat will have to be measured if you do not wish to "tare" the balance when the weight boat is on it - the instruction in the question prefers the former.

Assuming the mass of the weight boat is measured to be 10g (and then recorded), the unknown is added to it until the balance reads 60g.

Hence,

The total mass recorded on the balance = the mass of the weight boat + 50g of the unknown sample.

When the unknown sample is then poured into the 10 ml of water in the 25 ml graduated cylinder, the volume of water will rise. The final volume of the water must be recorded in order to calculate the change in volume.

change in volume = Final volume recorded - 10 ml (volume of water before the sample was added)

Density of the unknown solid = mass of unknown solid (50 g) ÷ change in volume

This process is done three times (and all values recorded) for each metal (X, Y and Z). And the process is also done (three times with all values recorded) with different masses of 75 g and 100 g of the unknown sample.

In order to calculate the average density of each unknown metal, the following can be done.

The average density of unknown metal X of 50g (assuming it's DX₁) = (density obtained after first experiment + density obtained after second experiment + density obtained after third experiment)/3

The average density of unknown metal X of 75g (assuming it's DX₂) = (density obtained after first experiment + density obtained after second experiment + density obtained after third experiment)/3

The average density of unknown metal X of 100g (assuming it's DX₃) = (density obtained after first experiment + density obtained after second experiment + density obtained after third experiment)/3

The average density of metal X = (DX₁ + DX₂ + DX₃)/3

The same calculations (above) is repeated for metals Y and Z.

From the question, platinum has the highest density, followed by rhodium and then silver. Hence, after the experiments and then the calculations, the unknown metal with the highest average density will be assumed to be platinum and the next one will be assumed to be rhodium while the one with the least average density will be assumed to be silver.

Answer:

B: geothermal energy comes from eternal heat of earth.

Explanation:

Answer:

1)If I mixed salt in water I would expect the salt to: dissolve.

2) If I mixed starch in water I would expect the starch to: remain undissolved.

Explanation:

Hello,

In this case, since salt, which is commonly known as sodium chloride (NaCl) is an ionic compound, it is very likely to get dissolved in water, therefore, we would expect the salt to dissolve and form a liquid solution.

Moreover, since start is mainly composed by C-C, C-O and C-H bonds which are nonpolar, it we can say it is usually insoluble in water, therefore we will expect starch to remain undissolved but undergoing a process called gelatinization in which a suspension in formed until a slightly solid consistency.

Best regards.

Answer:

You would need 8 eight packs of water

Explanation:

32  x  2 (seeing as this is the amount of water each person consumes)

= 64 divided by 8 (the amount of water in each pack)

= 8 eight packs of water

Answer:

Answer C physical and chemical

Answer:

Point out that when water freezes, the water molecules have slowed down enough that their attractions arrange them into fixed positions. Water molecules freeze in a hexagonal pattern and the molecules are further apart than they were in liquid water.

Answer: Point out that when water freezes, the water molecules have slowed down enough that their attractions arrange them into fixed positions. Water molecules freeze in a hexagonal pattern and the molecules are further apart than they were in liquid water.

Explanation: The molecules in the rice would be vibrating!!!!!!

Answer:

Yes , because they are not yet proven.

Hope this helps-xoxo

Answer:yes

Explanation:ideas are theoris the are incomplete

Answer: 29%

Explanation:

Answer:

b 29 percent

Explanation: