Answer:
66.7%
Explanation:
The reaction for the titration of the excess ferrous ion is:
5Fe⁺² + MnO₄⁻ + 8H⁺ → 5Fe³⁺ + Mn²⁺ + 4H₂OWe calculate the moles of Fe⁺² from the used moles of KMnO₄:
0.02 M * 15.0 mL = 0.30 mmol KMnO₄0.3 mmol KMnO₄ * [tex]\frac{5mmolFe^{+2}}{1mmolKMnO_4}[/tex] = 1.5 mmol Fe⁺²Then we substract those 0.30 mmol from the original amount used:
0.1 M * 50.0 mL = 5.0 mmol Fe⁺²5.0 - 1.5 = 3.5 mmol Fe⁺²The reaction between ferrous ammonium sulfate and MnO₂ is:
2Fe⁺² + MnO₂ + 4H⁺ → 2Fe³⁺ + Mn²⁺ + 2H₂OSo we convert those 3.5 mmol Fe⁺² that were used in this reaction to MnO₂ moles:
3.5 mmol Fe⁺² * [tex]\frac{1mmolMnO_2}{2mmolFe^{+2}}[/tex]= 1.75 mmol MnO₂Then we convert MnO₂ to Mn₃O₄, using the reaction:
3MnO₂ → Mn₃O₄ + O₂1.75 mmol MnO₂ * [tex]\frac{1mmolMn_3O_4}{3mmolMnO_2}[/tex] = 0.583 mmol Mn₃O₄Finally we convert Mn₃O₄ moles to grams:
0.583 mmol Mn₃O₄ * 228.82 mg/mmol = 133.40 mg Mn₃O₄And calculate the percent
0.2 g = 200 mg133.40 / 200 * 100% = 66.7%500 cc of 2N Na2CO3 are mixed with 400 cc of 3N H2SO4 and volume was diluted to one litre. Will the resulting solutiomacidic,basic or neutral?Also calculate the molarity of the dilute solution.
Answer:
Given info : 500 cc of 2N Na2CO3 are mixed with 400 cc of 3N H2SO4 and volume was diluted to one litre. To find : will the resulting solution is acidic , basic or neutral ? Calculate the molarity of the dilute solution. solution : no of moles of Na2CO3 = normality/n %3D - factor x volume 2/2 x 500/1000 = 0.5 mol %D no of moles of H2SO4 = 3/2 x 400/100O = 0.6 mol %3D We see, Na2CO3 + H2S04 => Na2S04 + CO2 + H2O Here one mol of Na2C03 reacts with one mole of H2SO4. So, 0.5 mol of Na2CO3 reacts with 0.5 mol of H2SO4. so, remaining 0.1 mol of H2SO4 makes solution acidic. Now molarity of solution = remaining no of moles of H2SO4/volume of solution= 0.1/1 = %3D 0.1M
"When 500 cc of 2N [tex]Na_{2}CO_{3}[/tex] is mixed with the 400 cc of 3N [tex]H_{2} SO_{4}[/tex] and volume was diluted to one liter then solution will be acidic and molarity will be 0.55 mol"
What is Molarity?
The molar concentration of a chemical species, specifically a solute in a solution, is measured in terms of the amount of material per unit volume of solution.
It is given that normality of [tex]Na_{2}CO_{3}[/tex] is 2 and [tex]H_{2} SO_{4}[/tex] is 3. It can be written in term of molarity like, the molarity of [tex]Na_{2}CO_{3}[/tex] is 0.1 M and molarity of [tex]H_{2} SO_{4}[/tex] is 1.5 M.
Now calculate the number of moles in [tex]Na_{2}CO_{3}[/tex]
For [tex]Na_{2}CO_{3}[/tex] = 500 cc / 1000 cc/L ×0.1 mol/L =0.05 mol.
For [tex]H_{2} SO_{4}[/tex] = 400 cc/ 1000 cc/L × 1.5mol /L = 0.60 mol.
It can be said that 0.05 mol reacts with 0.05 mol [tex]H_{2} SO_{4}[/tex] .
Now calculate the molarity of [tex]H_{2} SO_{4}[/tex] solution= 0.55 mol /L = 0.55 mol.
Hence, remaining 0.1 mol solution will make acidic.
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what causes convection currents in a gas or liquid?
Answer:
Convection currents are caused by a temperature difference in gases and liquids. As one area becomes warmer than another the molecules have more energy and start vibrating more vigorously thus spreading out and becoming less dense. This means that the less dense parts will become more buoyant causing them to rise.
Explanation:
Answer:
Convection currents are caused by a temperature difference in gases and liquids.
Explanation:
As one area becomes warmer than another the molecules have more energy and start vibrating more vigorously thus spreading out and becoming less dense. This means that the less dense parts will become more buoyant causing them to rise.
What does this passage explain about people?
why mothers favor some children over others
the contrasting sides of human nature
why there is harmony in all things
left- and right-handedness
Answer:
the contrasting sides of human nature
Explanation:
I took the test
1. Name the structure that the arrow points to
Answer:
i have been doing research and i think its the style. if not its the pollen tube.
Explanation:
Hope i helped!
Answer:
stigma
Explanation:
The rms speed of the molecules of a gas at 145∘C is 187 m/s. Calculate the mass m of a single molecule in the gas.
The mass m of a single molecule in the gas is 32.19 g
The root square mean (R.M.S) velocity V of the molecules of a really perfect fuel is given with the aid of the expression, v=sqrt(3RTM) and v=sqrt(3KTm) where R is universal gas consistent, T is absolutely the (Kelvin) temperature, m is the molar mass, okay is Boltzmann's consistent and M is the molecular mass.
The basis-mean-square speed is utilized in fuel, for the measure of the speed of debris, mentioned as the square root of the common speed-squared of the molecules in a gas. it's far represented with the aid of the equation:
Calculation:-
vrms=√3RT/M,
M = √3RT/vrms
= 1.732 × (8.314) ×418 / 187
= 32.19 g
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How many milliliters of 6.2 M M HCl H C l solution are needed to obtain 0.18 mol m o l of HCl H C l ?
Answer:
29 mL HCl
General Formulas and Concepts:
Chem
Molarity = moles of solute / liters of solutionExplanation:
Step 1: Define
6.2 M HCl
0.18 mol HCl
x L mol HCl
Step 2: Define conversions
1 L = 1000 mL
Step 3: Find L
6.2 M HCl = 0.18 mol HCl / x L HCl
(x L HCl)(6.2 M HCl) = 0.18 mol HCl
x L HCl = 0.18 mol HCl / 6.2 M HCl
x = 0.029032 L HCl
Step 4: Convert
[tex]0.029032 \ L \ HCl(\frac{1000 \ mL \ HCl}{1 \ L \ HCl} )[/tex] = 29.0323 mL HCl
Step 5: Check
We are given 2 sig figs. Follow sig fig rules.
29.0323 mL HCl ≈ 29 mL HCl
Answer:
29 mL HCl
Explanation:
5. What is metallic bonding?
6. Why are metals shiny?
Answer:
Metallic bonding is found in metals and their alloys. When the atoms give up their valence electrons, they form ions. These ions are held together by the electron cloud surrounding them. Metals are shiny because they have a lot of free (i.e. delocalized) electrons that form a cloud of highly mobile negatively charged electrons on and beneath the smooth metal surface in the ideal case. ... In the absence of any external EM field, the charges in the plasma are uniformly distributed within the metal.
Explanation:
In metallic bonding, the electrons are “surrendered” to a common pool and become shared by all the atoms in the solid metal.
What is the pH of a 0.164 M monoprotic acid whose Ka is 9.217 × 10−3?
Answer:
The pH of the solution is 1.68.
Explanation:
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A 50.0 mL solution of Ba(OH)2 is combined with a 150 mL solution of 0.20 M HCl. If the resulting solution has a hydroxide ion concentration of 0.12 M, what was the concentration of Ba(OH)2 in the original solution?
Answer:
0.54M of Ba(OH)2
Explanation:
When Ba(OH)2 reacts with HCl, BaCl2 and H2O are produced as follows:
Ba(OH)2 + 2HCl → BaCl2 + 2H2O
The remanent hydroxide ion is because not all Ba(OH)2 reacts. Thus, we need to find moles of Ba(OH)2 that doesn't react and moles of Ba(OH)2 that reacts. The ratio between total moles and volume of the Ba(OH)2 solution = 0.050L is the molarity of the original solution
Moles of Ba(OH)2 that doesn't react:
50mL + 150mL = 0.200L * (0.12 mol OH- / L) = 0.024 moles OH-
2 moles of OH- are in 1 mole of Ba(OH)2:
0.024 moles OH- * (1mol Ba(OH)2 / 2 mol OH-) = 0.012 moles Ba(OH)2
Moles of Ba(OH)2 that react:
0.150L * (0.20mol / L) = 0.030 moles HCl
2 moles of HCl react per mole of Ba(OH)2:
0.030 moles HCl * (1mol Ba(OH)2 / 2 mol HCl) = 0.015 moles Ba(OH)2
Total moles:
0.012mol + 0.015mol = 0.027mol Ba(OH)2 in 50mL
0.027mol Ba(OH)2 / 0.0500L =
0.54M of Ba(OH)2
A solution is made by dissolving
37.5 g of sodium sulfide (Na2S) in
217 g of water.
What is the molality of the solution?
Answer:
2.21m
Explanation:
Molality, m, is defined as the ratio between moles of solute (The substance that is in less amount, sodium sulfide) and kilograms of solvent (Water, in this case).
Thus, we need to convert mass of sodium sulfide to moles using its molar mass and grams of water to kilograms:
Moles Na2S (Molar mass: 78.0452g/mol):
37.5g * (1mol / 78.0452g) = 0.48 moles Na2S
Kilograms water:
217g * (1kg / 1000g) = 0.217kg
Molality:
0.48 moles Na2S / 0.217kg =
2.21mAnswer:
2.21
Explanation:
Mr. Juan is husband of Maria, before they get married Maria knows that her husband cannot make a baby since he cant produce sperm. But during their 2 years in marriage, Maria got pregnant. Is Juan can file a case to Maria? What it is? Support your answer?
Answer:
yes but first he need to check himself
Explanation:
bcoz if he cannot produce a sperm than she might have cheated him and the baby might be of someone other.
Which diagram shows what can happen when a small force affects the lithosphere without causing a break?
o
O
M
What volume will be occupied by 33.0 grams of CO2 at 500 torr and 27 °C?
Answer:
V = 27.98 L
Explanation:
Given data:
Mass of CO₂ = 33.0 g
Pressure = 500 torr
Temperature = 27°C
Volume occupied = ?
Solution:
Number of moles of CO₂:
Number of moles = mass/molar mass
Number of moles = 33.0 g/ 44 g/mol
Number of moles = 0.75 mol
Volume of CO₂:
PV = nRT
R = general gas constant = 0.0821 atm.L/ mol.K
Now we will convert the temperature.
27+273 = 300 K
Pressure = 500 /760 = 0.66 atm
By putting values,
0.66 atm×V = 0.75 mol × 0.0821 atm.L/ mol.K × 300 K
V = 18.47 atm.L/0.66 atm
V = 27.98 L
The volume that will be occupied by 33.0 grams of CO2 at 500 torr and 27 °C is 28.11L.
IDEAL GAS LAW:The volume of an ideal gas can be calculated using the ideal gas law equation as follows:
PV = nRT
Where;
P = pressure (atm)V = volume (L)n = number of moles (mol)R = gas law constant (0.0821 Latm/molK)T = temperature (K)According to this question;
P = 500torr = 0.657atmV = ?n = 33/44 = 0.75molT = 27°C = 27 + 273 = 300K0.657 × V = 0.75 × 0.0821 × 300
0.657V = 18.4725
V = 18.4725 ÷ 0.657
V = 28.11L
Therefore, the volume that will be occupied by 33.0 grams of CO2 at 500 torr and 27 °C is 28.11L.
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Double replacement :
2Na₃PO₄+3CaCl₂⇒6NaCl + Ca₃(PO₄)₂
Further explanation1. A single replacement reaction is a chemical reaction in which one element replaces the other elements of a compound to produce new elements and compounds
2. Double-Replacement reactions. Happens if there is an ion exchange between two ion compounds in the reactant to form two new ion compounds in the product
3. Combination/syntesis : 2 or more reactants combine to form a new compound
4. Decomposition : the reactant is decomposed into 2/more products
If we look at the reaction options available, all of them can be included in the double replacement reaction, but we only choose the reaction from Sodium phosphate and Calcium chloride which leads to options: C because it is balanced (from the number of atoms in the same reactant and product) and is in accordance with the chemical formula of each compound (both products and reactants)
How is zinc chloride formed
Answer:
Explanation:
Zinc chloride, ZnCl2, can be prepared by a direct reaction or by evaporating the aqueous solution formed in various reactions. It is strongly deliquescent (water-absorbing) and is utilized as a drying agent and as a flux.4
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What would be the mass, in grams, of 1.505 x 1023 molecules of carbon disulfide?
Answer:
19g
Explanation:
Given:
Number of molecules = 1.505 x 10²³molecules
Formula of compound = CS₂
Unknown:
Mass of the compound
Solution:
A mole of every substance contains 6.02 x 10²³molecules. Using this we can find the number of moles from number of molecules given;
6.02 x 10²³molecules makes up 1 mole of a substance
1.505 x 10²³molecules will contain [tex]\frac{1.505 x 10^{23} }{6.02 x 10^{23} }[/tex] = 0.25mole of CS₂
Mass of CS₂ = number of moles x molar mass
Molar mass of CS₂ = 12 + 2(32) = 76g/mol
Mass of CS₂ = 0.25 x 76 = 19g
Identify the term that matches each electrochemistry definition.
a. An electrochemical cell powered by a spontaneous redox reaction.
b. The electrode where reduction occurs.
c. The electrode where oxidation occurs
d. An electrochemical cell that takes in energy to carry out a nonspontaneous redox reaction.
e. A chemical equation showing either oxidation or reduction.
1. Cathode
2. Anode
3. Galvanic cell
4. Half reaction
5. Electrolytic cell
The correct matches are:
a. 3. Galvanic cell.
b. 1. Cathode.
c. 2. Anode.
d. 5. Electrolytic cell.
e. 4. Half reaction.
What is electrochemistry?Electrochemistry is the study of chemical reactions in which movement of electron happen.
An electrolytic cell is the cell in oxidation and reduction occurs.
It's all about how electrical energy interacts with chemical transformation.
For example, is concerned with the study of electrochemical cells. It is concerned with cells that convert chemical to electrical energy.
Thus, the correct matches are a. 3. Galvanic cell.
b. 1. Cathode.
c. 2. Anode.
d. 5. Electrolytic cell.
e. 4. Half reaction.
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An unknown metal has a mass of 77.3 g. When 3610 J of heat are added to the sample, the sample temperature changes by 52.1 ∘C. Calculate the specific heat of the unknown metal. Metal Specific heat (J/g⋅∘C) aluminum 0.897 tin 0.210 strontium 0.301 barium 0.204 calcium 0.650 nickel 0.440
Answer:
specific heat = .897 J /g°C
Explanation:
Quantity of heat added = mass x specific heat x rise in temperature
3610 = 77.3 x specific heat x 52.1
specific heat = .897 J /g°C
Unknown metal is Aluminium .
How are changes of state different from chemical change?
Question:
How are changes of state different from chemical change?
Answer:
Physical changes alter only the size, shape, form or matter state of a material. Water boiling, melting ice, tearing paper, freezing water and crushing a can are all examples of physical changes.
On the other hand, chemical changes are a bit different. In a chemical change, a new substance is formed.
Answer:
Chemical change happens when a substance changes they molecular structure, it often involves change in color (rusting iron), transfer of energy (copper smelting), or gas bubbling.
Changes of state is a physical change. An example is ice, it melts to create water. Water then can be freezed back to ice. Water is still H2O in both states（solid/liquid) Dissovling is another example. You can dissolve salt in water and can separate it by evaporating water and leaving the salt behind.
Explanation:
In the reaction of silver nitrate with copper metal, metallic silver comes out of solution, and the solution turns blue. This as a ________ reactio
Answer:
Single displacement reaction.
Explanation:
Hello!!
In this case, since the reaction between silver nitrate and copper metal is:
[tex]2AgNO_3(aq)+Cu(s)\rightarrow 2Ag(s)+Cu(NO_3)_2(aq)[/tex]
As silver was forming silver nitrate, due to the presence of copper, which has the capacity to displace silver out of the salt, we notice the formation of solid silver and a resulting copper (II) nitrate which is blue in aqueous solution.
Therefore, this is a single displacement reaction, because the the lonely copper displaced the silver.
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A chemist prepares a solution of calcium sulfate (CaSO4) by measuring out 0.232 g of calcium sulfate into a 300.mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mol/L of the chemist's calcium sulfate solution. Be sure your answer has the correct number of significant digits.
Answer:
5.6667*10^-3mol\L
Explanation:
get the number of moles:
0.0232\(40+32+16+16+16+16)=1.7*10^-3
get the consentration:
1.7*10^-3 \0.3=5.6667*10^-3mol\L
name the element whose atomicity is triatomic
Answer:
OZONE...............
How are protons and neutrons different from and similar to each other?
Answer: similar: Protons and neutrons have approximately the same mass, about 1.67 × 10-24 grams. Different:Protons are a type of subatomic particle with a positive charge. And Neutrons are a type of subatomic particle with no charge (they're neutral).
Explanation:
hope that helped
Answer:
similarity:Protons and neutrons have about the same mass
Difference protons have a positive charge while neutrons have no charge
Explanation:
2. Enumerate four Reactive Oxygen Species (ROS)
Answer:
Examples of ROS include peroxides, superoxide, hydroxyl radical, singlet oxygen, and alpha-oxygen.
ammonia is______a base
Answer:
Ammonia is moderately a base
how many atoms does sodium hypochlorite have?
Answer:
NaClO; the contained elements ae Na, Cl, O.
H20+ SO3 ? Which compound is likely produced by the chemical reaction?
Answer:
h2so4
Explanation:
im big brain.
What molecules are needed to make atp
Answer:
APT is made of a nitrogen base (adenine), a ribose sugar, and three phosphate groups.
Hope this helped! :)
Answer:
The energy released from each molecule of glucose is used to attach a phosphate to each of four molecules of adenosine diphosphate (ADP) to produce two molecules of adenosine triphosphate (ATP) and an additional molecule of NADH.
Explanation:
A sheet of aluminum measures 55.0 cm by 23.3 cm. If the volume is 2.90 cm^3 what is the thickness of the foil?
Express your answer with the appropriate units.
Answer:
0.0023 cm
Explanation:
The following data were obtained from the question:
Length (L) = 55 cm
Breadth (B) = 23.3 cm
Volume (V) = 2.9 cm³
Thickness (T) =?
Thus, we can obtain the thickness of the aluminum foil as illustrated below:
V = L × B × T
2.9 = 55 × 23.3 × T
2.9 = 1281.5 × T
Divide both side by 1281.5
T = 2.9/1281.5
T = 0.0023 cm
Therefore, the thickness of the aluminum foil is 0.0023 cm
A car's fuel efficiency is 39.0 miles per gallon. What is its fuel efficiency in kilometers per liter? (1.6094 km=1 mile)(1 gallon=3.79 L)
Answer:
the fuel efficiency in kilometers per liter is 16.561 kilometer per liter
Explanation:
The computation of the full efficiency in kilometers per liter is shown below:
39.0 miles ÷ gallon = (39.0 miles ÷ gallon) × (1.6094 km ÷ 1 miles) × (1 gallon ÷ 3.79 L)
Now cut the opposite miles and gallons
So, the fuel efficiency would be
= 16.561 kilometers per liter
Hence, the fuel efficiency in kilometers per liter is 16.561 kilometer per liter