Given that 4.50 dm³ of Pb(NO₃)₂ is cooled from 70 °C to 18 °C, the
amount amount of solute that will be deposited is 1,927.413 grams.
How can the amount of solute deposited be found?
The volume of water 1.33 dm³ of water 70 °C.
The number of moles of Pb(NO₃)₂ that saturates 1.33 dm³ of water at 70 °C = 2.25 moles
At 18 °C, the number of moles of Pb(NO₃)₂ that saturates 1.33 dm³ of water = 0.53 moles
Therefore;
Number of moles of Pb(NO₃)₂ in 4.50 dm³ at 70 °C is therefore;
1.33 dm³ contains 2.25 moles.
[tex]Number \ of \ moles \ in \ 4.50 \ dm^3 = \dfrac{2.25}{1.33} \times 4.50 \approx \mathbf{7.613 \, moles}[/tex]
Number of moles of Pb(NO₃)₂ in 4.50 dm³ at 70 °C ≈ 7.613 moles
Number of moles of Pb(NO₃)₂ in 4.50 dm³ at 18 °C is therefore;
1.33 dm³ contains 0.53 moles
[tex]Number \ of \ moles \ in \ 4.50 \ dm^3 = \dfrac{0.53}{1.33} \times 4.50 \approx \mathbf{1.79 \, moles}[/tex]
Number of moles of Pb(NO₃)₂ in 4.50 dm³ at 18 °C ≈ 1.79 moles
The number of moles that precipitate out = The amount of solute deposited
Which gives;
Amount of solute deposited = 7.613 moles - 1.79 moles = 5.823 moles
The molar mass of Pb(NO₃)₂ = 207 g + 2 × (14 g + 3 × 16 g) = 331 g
The molar mass of Pb(NO₃)₂ = 331 g/mol
The amount of solute deposited = Number of moles × Molar mass
Which gives;
The amount of solute deposited = 5.823 moles × 331 g/mol = 1,927.413 g
Learn more about saturated solutions here:
https://brainly.com/question/2624685
PLEASE HELP ME THIS IS TWENTY POINTS
Answer:
69 grams, as SO2 is interacting with the burning of coal
According to the passage, this model represents __________.
A )Solar eclipse
B) Lunar eclipse
C) 1st quarter moon
D) Last quarter moon
Answer:
This model represents Solar Eclipse.Explanation:
#CarryonlearningI will give brainliest. 1. A spiderweb and a Kevlar jacket have some obvious differences. Which property is similar between the web and the jacket?
- surface area
- thickness, expressed as a number of atoms
- overall strength
- arrangement of atoms in molecules
2. Assuming silk from spiderwebs could be made just as strong as Kevlar, why would a company still choose to use Kevlar in producing bulletproof fabrics?
- A much larger amount of silk might be needed to produce the same effect.
- Spiderweb silk would likely be rejected by the body.
- The cost might be higher for producing spiderweb silk.
- Spiderweb silk likely involves more chemicals.
3. Which microscopic detail affects the strength of different forms of silk?
- Different silk strands are made with different types of atoms.
- Different types of silk are in long strands or in other very different arrangements.
- Different silk strands have different combinations of amino acids.
- Different types of silk do not have the same strength if they come from different sources.
4. Which type silk is the strongest?
- nonbiodegradable
- minor ampullate
- major ampullate
- biodegradable
5. Which natural source has been bioengineered to make silk proteins?
- mulberry leaves
- goat milk
- goat hair
- mulberry bark
Answer:
arrangement of atoms in molecules.A much larger amount of silk might be needed to produce the same effect.- Different silk strands have different combinations of amino acids. .major ampullate.goat milkExplanation:
Using Organic Compounds quick check
do you know the refining design quick check
Answer: connections academy?
Explanation: do you go there? I saw that you were answering questions and asking for help on the midterm for A&P and the same one is currently on schedule for me
Convert the following word equations into formula equation
element and compound names into chemical formulas.
1. Sodium + oxygen → sodium oxide
Answer:
gas
Explanation:
it makes a gas there
How many atoms of oxygen are contained in 160 grams of N203?
Answer:
3.80 × 1024 grams containingExplanation:
Step 1: calculate the moles of N2O3
moles= mass N2O3 /molar mass N2O3
molar mass of N2O3 = (14 x2) +( 16 x3) =76 g/mol
moles of N2O3 = 160 g/ 76 g/mol = 2.105 moles
Step 2: from the moles of N2O3 find the moles of Oxygen
=moles of N2O3 x number of oxygen atoms in N2O3( 3)
= 3 x 2.105 =6.315 moles
Step 3:use the Avogadro's law to calculate the atoms of oxygen
that is according to Avogadro's law 1 mole = 6.02 x10 ^23 atoms
6.315 moles= ? atoms
={ (6.315 moles x 6.02 x10 ^23 atoms) / 1 mole} =3.80 x10^24 atoms
Why does Oxygen (O - 8) have a higher ionization energy than Tellurium (Te - 52)?
Can u help me plsasp u don’t have to rush but I am in a rush.
Answer:
nucleus
Explanation:
ASAP
What is the pressure in atm of 0.47mol of a gas in a 1.7L container at 276K?
Answer:
p= 6.26 atm
Explanation:
In stoichiometric calculations, which quantity MUST be used to convert from one chemical substance to another?
А
percent composition
B
percent yield
C mole ratio
D
molar mass
The answer is
C) mole ratio
Which type of wave interaction is shown in the photo? with ISSN AN O A. Diffraction O B. Reflection O C. Refraction O D. Absorption
I'm not sure what physical science would be under so I picked chemistry, sorry if it's wrong.
HELP ASAP!
Answer:
Diffraction
Explanation:
lesson 5 researching economics
Economic research or research in economics helps to provide data that is relevant and crucial to making forecasts and decisions relating to the economic activity of a state or an organization.
How does Economic research help the economy?
Research and Development in the field of economics aid in ensuring that expenditure is wisely dissipated to ensure maximum national productivity.
Results from proper economic research can be used to create a framework for effective innovations and public policies.
Learn more about Economic research at:
https://brainly.com/question/10564789
1. What is the primary reason that we need to balance equations in chemical
reactions?
Answer:
to know the relation between amount of necessary chemical substance.
E.g.
For burning 1 liter of CH4 we need 2 liters of O2 because CH4+2O2=CO2+2H2O
50POINTS PLS HELP
the current in the first circuit is 0.4 A. A
second identical bulb is added in series. What will the current in the second circuit be? pls answer quickly as possible i have an examination tomorrow so I am preparing for the tests thanks
0.8
bcus the first circuit had 0.4 current so if we added another one will add 0.4 so it will be 0.8
u can ask ur teacher or friends
Select the correct answer from each drop-down menu. Determine the molecular formula of the compound. A compound is used as a gasoline additive. It has a molecular weight of 60. 10 atomic mass units and an empirical formula of C3H8O. The molecular formula is C H O.
The molecular formula is the representation of the number of atoms and the chemical species of the elements. The molecular formula of the compound is [tex]\rm C_{3}H_{8}O_{1}.[/tex]
What is the molecular formula?A molecular formula depicts the chemical symbols of the atoms of the elements with the subscripts of the number of atoms present in the compound or the molecule.
Given,
Molecular weight of the compound = 60.10 amu
Empirical formula = [tex]\rm C_{3}H_{8}O[/tex]
Molar mass of carbon = 12.01 g/mole
Molar mass of oxygen = 15.99 g/mole
Molar mass of hydrogen = 1.01 g/mole
Calculate the empirical mass as:
[tex]\begin{aligned}\text{Empirical mass of}\; \rm C_{3}H_{8}O &= (3 \times 12.01)+(8 \times 1.01)+(1\times 15.99)\\\\&= 60.1\end{aligned}[/tex]
The molecular formula can be calculated as,
[tex]\begin{aligned}\text{ Molecular formula} &=\dfrac{\text{Molecular weight}}{\text{Empirical mass}}\\\\&= \dfrac{60.10}{60.1}\\\\&= 1\end{aligned}[/tex]
The molecular formula of the compound can be given by multiplying the subscripts of the empirical formula by 1.
Thus, the molecular formula of the compound is [tex]\rm C_{3}H_{8}O_{1}.[/tex]
Learn more about molecular formulas here:
https://brainly.com/question/862870
How many protons are in this atom if it has a balanced charge?
- 0
- 2
- 4
- 6
Answer:
6
Explanation:
If there are 6 electrons and it has a balanced charge, there also must be six protons.
Determine the empirical formulae of the compounds which contain:
9.39g P, 0.61 g H
The empirical formula of the compound containing 9.39 g of phosphorus and 0.61 g of Hydrogen is PH₂
Data obtained from the question Phosphorus (P) = 9.39 gHydrogen (H) = 0.61 gEmpirical formula =? How to determine the empirical formulaThe empirical formula of the compound can be obtained as follow:
Divide by their molar mass
P = 9.39 / 31 = 0.303
H = 0.61 / 1 = 0.61
Divide by the smallest
P = 0.303 / 0.303 = 1
H = 0.61 / 0.303 = 2
Thus, the empirical formula of the compound is PH₂
Learn more about empirical formula:
https://brainly.com/question/26273076
A compound is 54. 53% c, 9. 15% h, and 36. 32% o by mass. What is its empirical formula? insert subscripts as needed.
What is the difference between nuclear mass and atomic mass?.
What are the components of a voltaic cell?
Answer:
• The anode is an electrode where oxidation occurs.
• The cathode is an electrode where reduction occurs.
• A salt bridge is a chamber of electrolytes necessary to complete the circuit in a voltaic cell.
• The oxidation and reduction reactions are separated into compartments called half-cells.
•The external circut is used to conduct the flow of electrons between the electrodes of the voltaic cell and usually includes a load.
• The load is the part of the circuit which utilizes the flow of electrons to perform some function.
When the humidity is high, the change of precipitation is (high or low).
Answer:
low, when humidity is low, the chance of precipitation is high.
(so the answer is low :)
Explanation:
Someone please answer i’ll give brainly.
How many atoms of carbon of 6 molecules of C2H2
Answer:
12
Explanation:
2 per molecule X 6 molecules in total = 12
Answer:
12
Explanation:
6×2
Eny thing to explain?
Put the basic steps of pyruvate oxidation in order.
Answer:
1. carboxyl group is removed from pyruvate and releases 1 co2 molecule and leaves 2 carbon molecules
2. 2-carbon molecule is oxidized and electrons lost in oxidation are picked up by nad+ to form Ndah
3. oxidized 2 carbon molecule is attached to coenzyme a to form ACETYL COA
Explanation:
Which natural source has been bioengineered to make silk proteins?
O goat milk
O mulberry leaves
O goat hair
O mulberry bark
Answer:
A. goat milk
Explanation:
Took the Quick Check
Recent data indicates atmospheric carbon dioxide (CO2) levels are rising. What change in the carbon cycle has most likely caused this increase in atmospheric CO2?.
The atmospheric carbon dioxide has been increased due to the increased industrial gases and the greenhouse effects.
What is the carbon cycle?The carbon cycle has been given as the rotation of the carbon in the atmosphere in different forms. The carbon has been absorbed by plants and the degradation passed the carbon from the plants forms the transfer of carbon to the soil.
The increased activities such as industrial gases, greenhouse gases, and other effects resulted in the increased carbon in the atmosphere and thereby the interruption to the carbon cycle.
Learn more about the carbon cycle, here:
https://brainly.com/question/1627609
What is the effect of this organism on the ecosystem's current food web?
Answer:
Organisms within each group gain energy by feeding on the organisms in the group below them on the food chain. The top predator of a food chain is the carnivore within the community that does not have any predators of its own. When the top predator dies, their remains are broken down by decomposers—bacteria and fungi.
Explanation:
A laboratory assistant needs to prepare 35. 2 liters of hydrogen at 25. 0°C and 101. 3 kilopascals. This is the equation for the reaction: 2HCl Ca → H2 CaCl2 What volume of 2. 3 M hydrochloric acid is required to produce this much gas? Use the ideal gas resource. A. 0. 625 L B. 0. 876 L C. 1. 18 L D. 1. 25 L.
The ideal gas equation states that the volume is directly proportional to the moles and temperature but inversely to pressure. The volume required is 1.25 L.
What is the ideal gas equation?An ideal gas is the hypothetical gas equation that depicts the relation of the temperature, pressure, volume and moles of the substance of the gas. It is given as,
[tex]\rm PV = nRT[/tex]
Where,
The pressure of hydrogen gas (P) = 1 atm
The volume of hydrogen gas (V) = 35.2L
The temperature of hydrogen gas (T) = 298 K
Gas constant (R) = 0.0821 L. atm. per mol. per K
Substituting values in the equation,
[tex]\begin{aligned}\rm n &= \rm \dfrac{PV}{RT}\\\\&= \dfrac{35.2\times 1}{0.0821\times 298}\\\\&= 1.438\;\rm moles\end{aligned}[/tex]
The balanced chemical reaction can be shown as,
[tex]\rm 2HCl + Ca \rightarrow H_{2} + CaCl_{2}[/tex]
From the reaction, it can be deduced that, 2 moles of hydrochloric acid = 1 mole of hydrogen gas.
So, 1.438 moles of hydrogen molecules will produce 2.876 moles of HCl.
The volume of HCl can be calculated as,
[tex]\begin{aligned}\rm Volume &= \rm \dfrac{moles}{Molarity}\\\\&= \dfrac{2.876}{2.3}\\\\&= 1.25\end{aligned}[/tex]
Therefore, option D. 1.25 L is the volume of the hydrochloric acid.
Learn more about volume and molarity here:
https://brainly.com/question/11150331
What is the molarity of a solution with 55 grams of CaCL2 dissolved in. 78 L of water?
A. 1. 3 M
B. . 64 M
C. . 91 M
D. . 71 M
Answer:
A is the correct ans
Explanation:
Define climate and weather. What is climate change? Why is it important to know about climate change?
Answer:
It's important that we understand how the climate is changing so that we can prepare for the future. Studying the climate helps us predict how much rain the next winter might bring, or how far sea levels will rise due to warmer sea temperatures.
Weather is the state of the atmosphere at any given time and place.
Climate is the long-term average of the weather in a given place
Weather refers to short-term atmospheric conditions while climate is the weather of a specific region averaged for a long period.
Due to various reasons like different types of pollution and industrialization today the average temperature of the earth has begun to rise as a result several consequences are being faced by humans, one of which is climate change.
As the average temperature of the earth has begun to rise due to heavy industrialization, this is known as global warming. As a consequence, We face climate change in the terms of glacier meltdowns, irregular rainfall, and so on.
It is important to know about climate change because, at this point, our generation can reduce its effects of it and save future generations of the earth from being destroyed. If the temperature of the earth continues to rise, soon the plant will become inhabitable, and the entire human species will get vanished from the planet.
So, it is important for the current generation to know about the climate change and take steps in accordance with it.
Effects of climate change on agriculture:
https://brainly.com/question/28780196
What helps to determine what a biome is like?
Government, economy, and culture
Light, water, temperature, and wind
Light, temperature, and elevation
Water, wind, and economy
Answer:
Light, water, temperature, and wind
Explanation:
Which plate has the most countable
colonies? Use the CFU calculator to
determine the cfu/ml.
can someone please help with this I hate it so much
The agar plate with the most countable colonies should be determined by using a colony forming unit (CFU) calculator.
What is a colony?
A colony can be defined as a group of visible mass of microorganisms such as bacteria, fungi, that originated (cultured) from a single-mother cell and are grown on a solid agar medium.
In order to determine the most countable colonies, we have to count the total number of colonies by using a hemacytometer and then use a colony forming unit (CFU) calculator to determine the cfu/mL.
Note: You should choose a dilution factor based on the total number of colonies contained in the agar plate.
Finally, input the correct dilution factor into the colony forming unit (CFU) calculator to determine which agar plate has the most countable colonies.
Read more on dilution factor here: https://brainly.com/question/24881505
