Moles of Carbon dioxide : 0.75
Further explanationGiven
23 g C₃H₈O₃
Required
Moles of Carbon dioxide
Solution
Reaction
2C₃H₈O₃ + 7O₂ → 6CO₂ + 8H₂O
mol C₃H₈O₃ :
= mass : MW
= 23 g : 92,09382 g/mol
= 0.24975
From the equation, mol ratio of C₃H₈O₃ : 3CO₂ = 1 : 3, so mol CO₂ :
= 3/1 x mol C₃H₈O₃
= 3/1 x 0.24975
= 0.74925≈0.750 mol
Considering the following polymer size fractions of a given polymer sample:
Fraction Molecular Weight Number of Chains
1 6,500 400
2 10,000 1000
3 1,000,000 8
(a) Calculate the number-average molecular weight of the polymer.
(b) Calculate the weight-average molecular weight of the polymer.
(c) Which average molecular weight did the 8 chains of molecular weight of 1,000,000 most significantly affect? why?
(d) Calculate the polydispersity index(PI = (Mw/Mn) of the polymer
Answer:
Explanation:
From the information given:
Molecular weight Mi Number of chains (Ni) NiMi
400 6500 2600000
1000 10000 10000000
8 1000000 8000000
[tex]\sum_{Ni} = 1408[/tex] [tex]\sum _{NiMi}[/tex] = 20600000
Thus, the average number of molecular weight = [tex]\dfrac{\sum_{NiMi}}{\sum_{Ni} }[/tex]
[tex]= \dfrac{20600000}{1408}[/tex]
= 14630.68
b)
weight-average molecular weight = [tex]\dfrac{\sum _{NiMi^2} }{\sum _{NiMi}}[/tex]
[tex]Ni[/tex] [tex]Mi[/tex] [tex]Mi^2[/tex] [tex]Ni[/tex] [tex]Mi^2[/tex]
400 6500 42.25 × 10⁶ 16.9 × 10⁹
1000 10000 100 × 10⁶ 100 × 10⁹
8 1000000 1 × 10¹² 800 × 10⁹
[tex]\sum _{NiMi^2} = 916.9 \times 10^9[/tex]
weight-average molecular weight [tex]=\dfrac{916.9 \times 10^9 }{20.6 \times 10^6}[/tex]
= 44509.71
c)
The number average molecular weight is most significantly affected. This is because the number average molecular weight value is worth more in comparison to the weight-average molecular weight.
d)
The polydispersity index (PI) = [tex]\dfrac{\overline {M_W}}{\overline {M_n}}[/tex]
[tex]PI = \dfrac{44509.71}{14630.68}[/tex]
PI = 3.04
The solubility in water of ionic compound X is measured and found to be 0.776g/mL at 15.°C. Calculate the volume of a saturated solution of X in water that would contain 34.0g of X at this temperature. Be sure your answer has the correct unit symbol and 3 significant digits.
Answer: The volume of a saturated solution of X in water that would contain 34.0g of X is 43.9 ml
Explanation:
Solubility is defined as the amount of solute dissolved per 100 ml of the solvent at a fixed temperatur.
Given : solubility of ionic compound X in water at [tex]15^0C[/tex] = 0.776 g/ml
0.774 g of X is contained in = 1 ml
Thus 34.0 g g of X is contained in = [tex]\frac{1}{0.774}\times 34.0=43.9 ml[/tex]
Thus the volume of a saturated solution of X in water that would contain 34.0g of X is 43.9 ml
What is the mass of 5.07 mol N2?
(Answer)grams (3 SF)
Answer:
Mass, m = 141.96 kg
Explanation:
Given that,
Moles = 5.07
Molar mass of N₂ = 28 g/mol
We need to find the mass of 5.07 mol N₂.
We know that,
No of moles is equal to mass divided by molar mass i.e.
[tex]n=\dfrac{m}{M}[/tex]
Where
m is mass of 5.07 mol of N₂
So,
[tex]m=n\times M\\\\m=5.07\times 28\\\\m=141.96\ kg[/tex]
So, the required mass of 5.07 mol N₂ is 141.96 kg.
Which is a result of the high surface tension of water?
A. Water droplets are round.
B. Water freezes from the top down.
C. Ionic compounds are soluble in water.
D. Oil and water separate into two layers.
Answer:
A
Explanation:
How would the
In an isolated system, two copper
bars at different temperatures transfer energy until both are at the same temperature.
of energy be different if the bars were in an open system?
transfer
O A. Energy transfer would occur only between the copper bars.
between the copper bars and the surroundings
O B. Energy transfer would occur between the copper
© c. No energy transfer would occur between the
copper bars or the surroundings.
D. Energy transfer would occur only with the surroundings.
Answer: Energy transfer would occur only between the copper bars and the surroundings.
Explanation:
It should be noted that in the open system, there is transfer of both energy and mass from the system and also into the system as well.
Assuming the bars were in an open system, the transfer of energy would occur only between the copper bars and the surroundings.
Explanation:
In an isolated system, two copper bars at different temperatures transfer energy until both are at the same temperature. How would the transfer of energy be different if the bars were in an open system?
A.
Energy transfer would occur only between the copper bars.
B.
Energy transfer would occur between the copper bars and the surroundings.
C.
No energy transfer would occur between the copper bars or the surroundings.
D.
Energy transfer would occur only with the surroundings.
Substance A dissolves in water. What can be said about substance A?
O It is unsaturated.
It is nonpolar.
It is saturated.
It is polar.
Answer:
It is polar.
Explanation:
Water is a polar solvent and it can only dissolve another solute or substance.
As a general rule of solubility "likes dissolves likes".
This implies that when a polar solvent is used, it will dissolve a polar solute.
Also, a non-polar solute will only dissolve in a non-polar solvent.
Water is an example of polar solute. Other solutes such as salt can dissolve in water because they are polar in nature. A non-polar solvent is oil.A nuclear magnetic resonance, or NMR, spectrometer is an instrument that can be used to characterize molecules based upon the excitation of inner shell electrons. the behavior of the nuclei of certain atoms in a magnetic field. the nuclear radiation emitted by certain molecules. vibrations of portions of the molecule brought about by the absorption of infrared radiation.
Answer:
The correct answer is A)
Explanation:
An NMR or Nuclear Magnetic Resonance Spectrometer is an equipment that can be used to study the nature of molecules after their nuclei have been excited with the use of radio waves. Radio waves generated is converted into nuclear magnetic resonance.
The resonance produced can be recognized or decoded by special radio receivers.
Besides recognizing the molecular structure of a chemical compound, it's purity and its content can also be analyzed.
Cheers!
Calculate the volume of a box which is 125 cm long, 37 cm wide, and 68 cm high. Report your answer with correct significant figures in cubic centimeters. please use significant figures!
Calculate the volume of a box which is 423 cm long, 12 cm wide, and 25 cm high. have significant figures in cubic centimeters.
Suppose you are measuring the mass of a solid sample on a balance using a weigh boat. You record the data in a table. Mass of weigh boat 1.326 g Mass of weigh boat and sample 7.635 g What is the mass of the solid sample?
A graduated cylinder contains 10.00 mL water. A 14.74 g piece of aluminum is added to the water, and the volume rises to 15.46 mL. What is the density of the aluminum?
A 24.5 g sample of solution has a density of 0.768 g/mL. What is the sample volume (in mL)?
Answer:
1. Volume of box is 314500 cm³.
2. Volume of box 126900 cm³.
3. Mass of sample is 6.309 g.
4. Density of aluminum is 2.7 g/mL.
5. Volume of sample is 31.9 mL.
Explanation:
1. Determination of the volume of the box
Length (L) = 125 cm
Width (W) = 37 cm
Height (H) = 68 cm
Volume (V) =?
V = L × W × H
V = 125 × 37 × 68
V = 314500 cm³
2. Determination of the volume of the box
Length (L) = 423 cm
Width (W) = 12 cm
Height (H) = 25 cm
Volume (V) =?
V = L × W × H
V = 423 × 12 × 25
V = 126900 cm³
3. Determination of the mass of the sample.
Mass of weigh boat = 1.326 g
Mass of weigh boat + Sample = 7.635 g Mass of the sample =?
Mass of Sample = (Mass of weigh boat + Sample) – (Mass of weigh boat)
Mass of Sample = 7.635 – 1.326
Mass of Sample = 6.309 g
4. Determination of the density of aluminum.
Volume of water = 10 mL
Mass of aluminum = 14.74 g
Volume of water + aluminum = 15.46 mL
Density of aluminum =?
Next, we shall determine the volume of aluminum. This can be obtained as follow:
Volume of water = 10 mL
Volume of water + aluminum = 15.46 mL
Volume of aluminum =?
Volume of aluminum = (Volume of water + aluminum) – (Volume of water)
Volume of aluminum = 15.46 – 10
Volume of aluminum = 5.46 mL
Finally, we shall determine the density of aluminum. This can be obtained as follow:
Mass of aluminum = 14.74 g
Volume of aluminum = 5.46 mL
Density of aluminum =?
Density = mass / volume
Density of aluminum = 14.74 / 5.46
Density of aluminum = 2.7 g/mL
5. Determination of the volume of sample.
Mass of sample = 24.5 g
Density of sample = 0.768 g/mL.
Volume of sample =?
Density = mass / volume
0.768 = 24.5 / volume of sample
Cross multiply
0.768 × Volume of sample = 24.5
Divide both side by 0.768
Volume of sample = 24.5 / 0.768
Volume of sample = 31.9 mL.
Give me a summary on Jupiter 3-5 paragraphs
I NEED HELP PLEASE!!!! CHEMISTRY QUESTION: If 38 g of Li3P and 15 grams of Al2O3 are reacted, what total mass of products will result? Why?
Answer:
21.5 g.
Explanation:
Hello!
In this case, since the reaction between the given compounds is:
[tex]2Li_3P+Al_2O_3\rightarrow 3Li_2O+2AlP[/tex]
We can see that according to the law of conservation of mass, which states that matter is neither created nor destroyed during a chemical reaction, the total mass of products equals the total mass of reactants based on the stoichiometric proportions; in such a way, we first need to compute the reacted moles of Li3P as shown below:
[tex]n_{Li_3P}^{reacted}=38gLi_3P*\frac{1molLi_3P}{51.8gLi_3P}=0.73molLi_3P[/tex]
Now, the moles of Li3P consumed by 15 g of Al2O3:
[tex]n_{Li_3P}^{consumed \ by \ Al_2O_3}=15gAl_2O_3*\frac{1molAl_2O_3}{101.96gAl_2O_3} *\frac{2molLi_3P}{1molAl_2O_3} =0.29molLi_3P[/tex]
Thus, we infer that just 0.29 moles of 0.73 react to form products; which means that the mass of formed products is:
[tex]m_{Li_2O}=0.29molLi_3P*\frac{3molLi_2O}{2molLi_3P} *\frac{29.88gLi_2O}{1molLi_2O} =13gLi_2O\\\\m_{AlP}=0.29molLi_3P*\frac{2molAlP}{2molLi_3P} *\frac{57.95gAlP}{1molAlP} =8.5gAlP[/tex]
Therefore, the total mass of products is:
[tex]m_{products}=13g+8.5g\\\\m_{products}=21.5g[/tex]
Which is not the same to the reactants (53 g) because there is an excess of Li₃P.
Best Regards!
what is a physical change
cutting a piece of paper
Explanation:
Answer:
A physical change occurs when a substance changes, but no new substance is formed.
Explanation:
According to the law of conservation of mass, how much mercury was present in the mercury (II) oxide? *
Mass of Mercury(Hg) : 55.8 g
Further explanationGiven
Reaction
2HgO ⇒ O₂ + 2Hg
Required
Mass of Mercury
Solution
Conservation of mass applies to a closed system, where the masses before and after the reaction are the same
So mass of reactants = mass of products
Mass of reactants = mass HgO = 60 g
Mass of products = mass O₂ + mass Hg
60 g = 4.2 g + mass Hg
mass Hg = 60 - 4.2
mass Hg = 55.8 g
which wave carris most energy
Answer:
Gamma Rays
Explanation:
Hope it helps!! :))
Tell me if im wrong.
Answer:
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Explanation:
Select the correct answer.
Which of the following does the Sun orbit?
A.
The center of the Milky Way
B.
The Earth
C.
The Moon
D.
The stars
1. The grains are separated from stalks by winnowing. (True/False
the mixture of carbon dioxide and water tastes salt why
Answer:
When carbon dioxide reacts with water carbonic acid is formed, from which hydrogen ions dissociate increasing the acidity of the systemCarbon dioxide emissions to the atmosphere can therefore increase the acidity of land, sea and air
Explanation:
How does mechanical weather affect rocks?
Mechanical weathering can cause rocks to melt.
Mechanical weathering can relocate rocks to different locations.
Mechanical weathering can cause rocks to break apart into sediments.
Mechanical weathering can change rocks into a different materials.
Answer:
C
Explanation:
Mechanical weathering, also called physical weathering and disaggregation, causes rocks to crumble. Water, in either liquid or solid form, is often a key agent of mechanical weathering. For instance, liquid water can seep into cracks and crevices in rock. ... It slowly widens the cracks and splits the rock
What is the mole ratio needed to determine the mass of phosphorus trifluoride produced from the reaction of 120 g of phosphorus with excess fluorine?
Answer:
[tex]\frac{4molPF_3}{1molP_4}[/tex]
Explanation:
Hello
In this case, given the reaction:
[tex]P_4(s)+6F_2(g)\rightarrow 4PF_3(g)[/tex]
It means that since the coefficients preceding phosphorous and phosphorous trifluoride are 1 and 4, the correct mole ratio should be:
[tex]\frac{4molPF_3}{1molP_4}[/tex]
Because given the mass of phosphorous it is convenient to convert it to moles and then cancel it out with the moles on bottom of the mole ratio.
Bes regards!
A 3.25 L solution is prepared by dissolving 285 g of BaBr2 in water. Determine the molarity.
Answer:
0.295 mol/L
Explanation:
Given data:
Volume of solution = 3.25 L
Mass of BaBr₂ = 285 g
Molarity of solution = ?
Solution:
Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.
Formula:
Molarity = number of moles of solute / L of solution
Number of moles of solute:
Number of moles = mass/ molar mass
Molar mass of BaBr₂ = 297.1 g/mol
Number of moles = 285 g/ 297.1 g/mol
Number of moles= 0.959 mol
Molarity:
M = 0.959 mol / 3.25 L
M = 0.295 mol/L
helppp pleaseee i really need to pass this class
NEED HELP FAST!!!!!!!!!!!!
3. Do objects of different masses fall at different rates? Why or why not? *
Answer:
yes.it depends on acceleration due to gravity,weight .
hey siri how do you make ice cube ????????????????????????????????????
Answer:
1.Get a ice cub tray.
2. fill cold water to the top.
3. Put the tray in the freezer.
4 let them sit for 3-4 hours.
5.Enjoy!
Explanation:
Answer:
put hotdogs in water boil em. put the water in the cube thingy and put it in the freezer
Are these sentences true or false? Tick the boxes
True False
a) The substance is an element.
b) The substance contains five atoms.
c) There is carbon in the substance.
d) The substance contains nitrogen and hydrogen.
If a substance has a density of 1.345g / mL , how many grams would the substance weigh if the sample has a volume of 22.1 ml?
Answer:
Mass of substance = 29.7245 gram
Explanation:
Given:
Density of substance = 1.345 g / ml
Volume of substance = 22.1 ml
Find:
Mass of substance
Computation:
Mass = Density x Volume
Mass of substance = Density of substance x Volume of substance
Mass of substance = 1.345 x 22.1
Mass of substance = 29.7245 gram
Is plastic pollution likely to become more or less of a problem in the future?
Answer:
More bro
Explanation:
Pollution is only increasing
Answer: Yes and no, no because people are constantly polluting the earth with plastic which is a big issue. Yes, because things are being invented to help with plastic pollution, and there is a great number of people who recycle, so however you look at it there's really a 50/50 chance.
Explanation:
Question 4
How many moles are contained in 67 L of CO2 gas at STP? Round your answer to three significant figures and include units.
Answer:
2.99 mol
Explanation:
Number of moles of CO₂ = ?
Volume = 67 L
Temperature and pressure = standard
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
By putting values,
1 atm × 67 L = n ×0.0821 atm.L/ mol.K × 273.15 K
67 atm.L = n×22.43 atm.L/ mol
n = 67 atm.L/22.43 atm.L/ mol
n = 2.99 mol
Can someone help me pls I don’t have time Time is almost ran out pls help
Answer:
Can you get a closer picture, then I can help! It looks like it says something on rain, hail and something else. I cant see it though! :)
Explanation:
How many grams of MgO are produced from the complete reaction of 94.2 g Mg?
Answer:
157 g of MgO
Explanation:
the reaction:
2Mg + O2 ➡️ 2MgO
1) find the mol of Mg
mol = mass / molar mass
mass = 94.2 g
molar mass = 24
mol = 94.2 / 24
mol = 3.925 mol
2 mol = 3.925 moles
2) find mass of MgO
mass = mol × molar mass
mol = 3.925
molar mass = 24+16 = 40
mass = 3.925 × 40
= 157 g
If Jim has a mass of 70 kg and is running at a rate of 6 m/s, what would his momentum be?
Answer:
p = 420 kg·m/s
Explanation:
i just looked up momentum calculator
