Answer:
Let's walk through this together, and pay close attention. The answers are bolded and underlined but I insist you to read through the whole thing and understand what's being applied here.
Write down the balanced equation first:
[tex]Pb(NO_{3})_{2} \ + \ 2KI \ ----- > \ PbI_2 \ + \ 2KNO_{3}[/tex]
24g 30g ???
To find the limiting reactant, convert both of the masses to moles and the lowest one is the limiting reagent.
Molar mass of Lead (II) Nitrate: 331.2g/mol
Molar mass of Potassium Iodide: 166g/mol
Remember: [tex]moles \ = \ \frac{mass}{molar \ mass}[/tex]
[tex]\frac{24}{331.2} = 0.0724 \ mol\ of\ Lead \ (II) \ Nitrate\\\\\frac{30}{166} = 0.180 \ mol \ of \ Potassium \ Iodide[/tex]
As you can see here, the compound with the lower mol value is Lead (II) Nitrate, meaning Lead (II) Nitrate is our limiting reactant.
To find the excess reactant which is the other reactant present, Potassium Iodide, you must do the mol to mol ratio of Lead (II) Nitrate to Potassium Iodide (Basically the numbers in front/coefficients of the compound in the balanced equation)
The ratio is 1 : 2, meaning you have to multiply the amount of mol of Lead (II) Nitrate by 2 to get the mol of Potassium Iodide.
[tex]0.0724 \ * \ 2 = \ 0.1448 \ mol \ of \ Potassium \ iodide[/tex]
Now we change the mol into mass by multiplying it by the molar mass of potassium iodide
[tex]0.1448 \ * \ 166 = \ 24.04g \ of \ Potassium \ iodide[/tex]
To get the amount of excess reactant, you have to subtract the original mass amount you had which was 30g by the mass you just got which is 24.04g
30 - 24.04 = 5.96g of Potassium Iodide is in excess left over
Our final question is to calculate the percentage yield of lead iodide, which we can do so by dividing the actual yield produced by the theoretical yield, and multiplying the answer of that by a 100 to get the percent.
We have our experimental yield which is 32.5g but we don't have our theoretical. We have to calculate it using our limiting reactant and mol ratios. The ratio of Lead (II) Nitrate to Lead (II) Iodide is 1 : 1 so all we have to is to change 0.0724 mol into the mass value by multiplying the mol with the molar mass of Lead (II) Iodide.
Molar mass of Lead (II) Iodide: 461.01g/mol
[tex]0.0724 \ * \ 461.01 = \ 33.4g[/tex]
So the theoretical yield is 33.4g and the actual yield was 32.5g
[tex]\frac{32.5}{33.4} * 100 = 97.3 \ percent[/tex]
The percentage yield of Lead (II) Iodide is 97.3%
Which of the following statements is FALSE?
Compounds are combinations of different elements found on the Periodic Table
Elements are composed of two or more compounds
Elements are the building blocks of compounds
O
Elements and compounds are both types of pure substances
37L of carbon dioxide decomposes. what mass of carbon results?
PLEASE HELP <3
The mass of carbon that resulted from the decomposition of 37 L of carbon dioxide is 19.8 g
Balanced equationCO₂ —> C + O₂
From the balanced equation above,
1 L of CO₂ decomposed to produce 1 L of C.
Therefore,
37 L of CO₂ will also decompose to produce 37 L of C
How to determine mass of CarbonAt standard temperature and pressure (STP),
22.4 L = 1 mole of C
Therefore,
37 L = 37 / 22.4
37 L = 1.65 mole of C
Thus, the mass of Carbon can be obtained as follow:
Mole of C = 1.65 mole Molar mass of C = 12 g/mol Mass of C =?Mass = mole × molar mass
Mass of C = 1.65 × 12
Mass of C = 19.8 g
Thus, 19.8 g of carbon were obtained from the reaction.
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At room temperature most of ionic compounds are: a) amorphous solids (b) crystalline solids c) liquids (d) gases(
The ionic compound are crystalline solids at room temperature
Explanation:
they are quite strong because they contain strong ionic bonds
At the room temperature, ionic compound will be crystalline solids.
What is Ionic compound?
Ionic compounds are made up of ions kept together by the attraction of oppositely charged ions. One of the most well-known ionic compound is common salt (NaCl). Molecular compounds are made up of separate molecules that are bonded together through electron sharing.
What is crystalline solid?The elements of a crystalline solid are grouped in a tightly packed microscopic structure, generating a crystal lattice that stretches in all directions.
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What are 2 instruments used to test for conductivity
Answer:
Your answer is probe and a meter.
Explanation:
Hope it helps
Good Luck
At what pressure will 4.80 moles of fluorine gas have a volume of 60.0 liters and a temperature of 298 K?
The pressure of the given mol of fluorine as an ideal gas at the given temperature and volume is 1.96atm.
Ideal Gas LawThe Ideal gas law or general gas equation emphasizes on the state or behavior of a hypothetical ideal gas. It states that "the pressure multiplied by volume is equal to moles multiply by the universal gas constant multiply by temperature.
It is expressed as;
PV = nRT
Where P is pressure, V is volume, n is the amount of substance, T is temperature and R is the ideal gas constant ( 0.08206 Latm/molK )
Given the data in the question;
Amount of fluorine gas n = 4.80molesVolume V = 60.0LTemperature T = 298KPressure P = ?To determine the pressure of the fluorine gas, we substitute our values into the expression above.
PV = nRT
P = nRT / V
P = ( 4.80mol × 0.08206Latm/molK × 298K ) / 60.0L
P = 117.378624Latm / 60.0L
P = 1.96atm
Therefore, the pressure of the given mol of fluorine as an ideal gas at the given temperature and volume is 1.96atm.
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A gas has a temperature of 56.5°C. What is the temperature in K?
Answer:
329.65 K
Explanation:
56.5°C + 273.15 K= 329.65 K.
Hope this helps, good luck!
What is the role of conservation of momentum to your safety either as pedestrians or as motorist?
The role of conservation of linear momentum is important to your safety as a pedestrian or a motorist because you will avoid being hit by car.
Conservation of linear momentumThe principle of conservation of linear momentum states that the sum of the initial momentum of an isolated system is equal to the sum of the final momentum.
The role of conservation of linear momentum is important to your safety as a pedestrian or a motorist because you will avoid being hit by car which is in motion, knowing that impulse you will receive will be equal to the change in the momentum of the car.
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For a research project on time management, Yuri needs to calculate how many hours the average high school student spends in school each year. Which of these dimensional analysis equations is the correct one for him to use?
Answer:
7 hours……….5 days……….36 weeks
————- X ————— X ———————
1 day…………..1 week…………..1 year
how many hours per year does a high school student spend in school?
1260 hours per year
Explanation:
Answer:
7 hours...............5 school days.......36 school weeks
-------------------X-----------------------X---------------------------
1 school day......1 school week.......1 school weeks
1,260 hours per week
Explanation:
edge 2023
While transferring naoh solution to the ph paper, you accidentally splash it onto your skin. check all actions you should take. tell your teacher right away. try to save the naoh for recycling purposes. neutralize by applying a small amount of acid (e.g., hcl). wipe the naoh with a paper towel and continue the experiment. rinse the exposed skin with water.
When NaOH solution is accidentally spilled on your skin while trying to transfer it into a pH paper, one should rinse the exposed skin with water.
How to deal with laboratory accidents?Chemical reagents can be found in the laboratory and are harmful to the human skin.
However, when transferring an alkaline solution of NaOH to the pH paper and one accidentally splashes it onto the skin, water should be poured to the affected part immediately.
The water washes away the chemical before it starts to have negative effect on the skin.
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Answer:
A) Tell your teacher right away
E) Rinse the exposed skin with water
Explanation:
edge 2022 <3
The quantitative amount of charge separation in a diatomic molecule contributes to the dipole moment of that molecule. A. True B. False
Answer:
The answer is True.
Explanation:
The sentence above is true it all adds up.
What is the amount of heat absorbed when the temperature of 75 grams of water increases from 20°C to 35°C?
Answer: 4707 J
Explanation:
help meeeeeeeeeeeeeeeeeeeeee
Answer:
Formula of water:H2O
Formula of potassium chloride:KCl
When CO2 and H2O react to form H2CO3, the number of bonds broken in H2O is ____ and in CO2 is _____. one; one
CO2 and H2O react to form H2CO3 and two bonds are broken each in CO and H2O to form H2CO3.
What is chemical bonding?Chemical bonding refers to the forces of attraction which hold atoms of the same or different elements together in order to form stable compounds or molecules .
Chemical bonding may be either ionic or covalent.
The greater the number of bonds in a compound, the more stable the compound.
During chemical reactions, bonds are broken and new binds are formed.
There are two bonds each in CO2 and H2O.
This, in the reaction between CO2 and H2O react to form H2CO3, , the number of bonds broken in H2O is two and in CO2 is two.
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What is the chemical formula of the phosphate ion?.
Answer: PO43
Explanation: The structure and formula are as follows: The chemical structure of phosphate is PO43-.
The molecular mass is 94.97 g/mol.
I need help in this question pleaaaaase!
The correct definition of oxidation in terms of oxygen, electron and hydrogen is added, lost , lost, (Row B).
What is an oxidation reaction?An oxidation reaction is a reaction in which the oxidation number if the reacting species increases in a positive direction.
Oxidation can be defined in terms of oxygen as the addition of oxygen. Oxidation can be defined in terms of electron as removal of electron Oxidation can be defined in terms of hydrogen as removal of hydrogen.Therefore, the correct definition of oxidation in terms of oxygen, electron and hydrogen is added, lost , lost, (Row B).
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HBr+ AI(OH)3 H2O + AIBr3
How to know if a reaction is endothermic or exothermic.
What is the wavelength of a photon with an energy of 4.56 x 10-19 J?
• A. 502 nm
• B. 436 nm
C. 688 nm
D. 460 nm
Answer:
B
Explanation:
We can use Planck's equation. Recall that:
[tex]\displaystyle E = h\nu[/tex]
Where h is Planck's constant and ν is the frequency.
We also have that:
[tex]\displaystyle \lambda \nu = c[/tex]
Where c is the speed of light and λ is the wavelength. Hence:
[tex]\displaystyle \nu = \frac{c}{\lambda}[/tex]
Therefore:
[tex]\displaystyle E= h\left(\frac{c}{\lambda}\right)[/tex]
Solving for λ yields:
[tex]\displaystyle \lambda = \frac{hc}{E}[/tex]
Hence substitute. Recall that h = 6.626 × 10⁻³⁴ Js and c = 2.998 × 10⁸ m/s:
[tex]\displaystyle \begin{aligned} \lambda & = \frac{(6.626\times 10^{-34}\text{ Js})(2.998\times 10^8\text{ m/s})}{4.56\times 10^{-19} \text{ J}} \left(\frac{1\times 10^9\text{ nm}}{1\text{ m}}\right) \\ \\ & = 436\text{ nm}\end{aligned}[/tex]
In conclusion, our answer is B.
What form of energy is produced by a stream of charged particles?
The flow of charged particles is called electricity. The flow of electrons around a circuit is called electric current.
hope it helps...!!!
Where does the energy generated by hydroelectric dams come from?
• A. Earth's internal heat
B. Fossil fuels
C. Flowing water
D. Fission reactions
Answer:
The answer would be C. Flowing water is where you get energy from hydroelectric dams.
What is the pH of a solution formed when 100 ML of an acid with a pH of two is diluted 1 L with pure water
Answer: look down hope I helped
Explanation:
1) First convert to pOH as OH is the dissociating species in a base equilibrium.pH + pOH = 14 (at 25 C)pH=13, hence pOH = 1,Hence [OH] = 10^-1 Mdiluting by factor of 10 with pure water gives [OH] = 10^-2 MThe new pOH = 2, hence the new pH is 12In general, dilution (with pure water) by a factor of 10 moves the pH 1 unit in the direction of the pH of water (pH 7). i.e. it moves up for acids, down for bases.(At infinite dilution of either acids or bases, you’d have pure water - obvious when you think of it like that)
Which postulate of daltons atomic model was later changed and why
NaHCO3(s) + HCl(aq) — NaCl(s) + H2011) + CO2
teacher reacts 84. 0 g of sodium bicarbonate with excess hydrochloric acid. What is the
percent yield for sodium chloride if 56. 0 g of sodium chloride is produced?
what is the total ionic and net ionic equation for for the reaction between between mercury (II) nitrate and iron (III) chloride.
Answer:
Hg+2 + 2Cl- -> HgCl2
HOPE THIS HELPS HAVE A GREAT DAY/NIGHT!!~
Explanation:
why don't we have a lunar eclipse every month?
PLEASE HURRY
Answer:
Beacause it does just in a different place
Explanation:
Because the Earth's orbit around the sun differs from the Moon's orbit around the Earth, lunar eclipse don't happen every month.
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Which answer best describes what is happening in the following redox reaction? 4fe 3o2 right arrow. 2fe2o3 this is combustion. this is neutralization. iron is oxidized to form rust. oxygen is oxidized to form rust.
The answer that best describes what is happening in the redox reaction 4Fe + 3O2 -> 2Fe2O3 is Iron is oxidized to form rust.
How is Iron is oxidized to form rust?Rusting is known to be a form o oxidation reaction. An iron is known to often reacts together with the elements of water and oxygen to bring about hydrated iron(III) oxide ( rust).
Conclusively, Always note that an Iron and steel rust is formed when these elements are said to come into any form of contact with water and oxygen as as thus rusting takes place just as seen in the redox reaction above.
See full question below
Which answer best describes what is happening in the following redox reaction?
4Fe + 3O2 -> 2Fe2O3
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Answer:
c
Explanation:
sneksks ansia soaks s
Answer:
hamburger
yes yes
Explanation:
none lol
Why are engineers an important part of the space exploration team?
----------------------
OPTIONS:
A) They use state-of-the-art technology.
B) They use the information that astronauts gather to make advancements in other fields of science.
C) They design and build spacecraft, space vehicles, and satellites.
D) They help astronauts train for weightlessness and spacewalks.
How does an indicator differentiate between an acid and base?
Changes solubility
Changes reactivity
Changes color
Changes size
Answer:
that is all I know sorry hope that may help you :)
Explanation:
Indicator is a substance which shows different colors in acidic and basic medium. Indicators can be natural (derived from natural sources) or artificial ( man-made) for example :
*Litmus is an indicator. Acid turns blue litmus into red while base turns red litmus into blue
* Turmeric solution does not show change in color (remains yellow) in acidic solution and turns red in basic solution.
why neon is special from other chemical elements
Answer: it has full valence shells
Explanation: Hope this is it
Answer:
Neon, along with helium, argon, krypton and xenon, make up the group known as noble gases. These are the most stable and least reactive elements due to having full valence shells (the outer shell has the max number of electrons, two for helium, eight for the rest).
Explanation:
Hope it helps
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