The question is incomplete, the complete question is;
In a laboratory experiment, students synthesized a new compound and found that when 12.23 grams of the compound were dissolved to make 228.1 mL of a benzene solution, the osmotic pressure generated was 4.55 atm at 298 K. The compound was also found to be non-volatile and a non-electrolyte. What is the molecular weight they determined for this compound?
Answer:
287.76 g/mol
Explanation:
From;
π = M R T
M = molarity
R= gas constant
T = temperature
number of moles = π * volume/RT
number of moles = 4.55 * 228.1/1000/0.082 * 298
number of moles = 1.037855/24.436
number of moles = 0.0425 moles
Molar mass = mass/number of moles
Molar mass = 12.23 grams/0.0425 moles
Molar mass = 287.76 g/mol
What do cuticles do for land plants that was not necessary for ancestors that lived in water
A. Cuticles Allow them to grow bigger and Taller.
B. Cuticles help them transport water.
C. Cuticles help prevent water loss.
D. Cuticles allow the performance of photosynthesis.
A sample of quartz, which has a specific heat capacity of , is dropped into an insulated container containing of water at and a constant pressure of . The initial temperature of the quartz is . Assuming no heat is absorbed from or by the container, or the surroundings, calculate the equilibrium temperature of the water. Be sure your answer has the correct number of significant digits.
This question is incomplete, the complete question is;
A 17.0 g sample of quartz, which has a specific heat capacity of 0.730 J.g⁻¹°C⁻¹, is dropped into an insulated container containing 200.0 g of water at 85°C and a constant pressure of 1 atm . The initial temperature of the quartz is 7.2°C.
Assuming no heat is absorbed from or by the container, or the surroundings, calculate the equilibrium temperature of the water. Be sure your answer has the correct 3 number of significant digits.
Answer:
the equilibrium temperature of the water is 83.9°C
Explanation:
Given the data in the question;
Since no heat is absorbed from or by the container, or the surroundings;
Then Heat lost by the quartz = heat gained by water
ΔH1 = ΔH2
DH = mcΔT
where m is mass, C is specific heat capacity and ΔT is temperature change;
so
(mcΔT)1 = (mcΔT)2
we know that; specific heat capacity of is 4200 Joule/Kilogram K (J/kg∙K) = 4.2 (J/g∙°C)
we substitute
17.0g × 0.730 J.g⁻¹°C⁻¹ × ( 7.2°C - T2) = 200.0g × 4.2 J/g∙°C × ( T2 - 85°C)
89.352 - 12.41T2 = 840T2 - 71400
840T2 + 12.41T2 = 89.352 + 71400
852.41T2 = 71489.35
T2 = 71489.35 / 852.41 = 83.86°C ≈ 83.9°C
Therefore, the equilibrium temperature of the water is 83.9°C
52
p3
N?
Br1
CaBr2
Cas
Ca3P2
Cal2
Ca3N2
Cat2
K1
Mg2
Zn2
Fe3
Characteristics of a substance that can be measured or observed by changing the identity of the material is a
Group of answer choices
A. physical property
B. chemical property
C. physical change
D. chemical change
What is the name of the process happening in the picture? How do you know it’s that process? Explain your answer in 2 to 3 complete sentences
This is to be removed in brown sugar and to be rolled with a rolling pin?
Answer:
The lumps should be removed in brown sugar and to be rolled with rolling pin.
Explanation:
In preparing brown sugar as ingredients in baking and pastry, it is important to check if the sugar is lumpy. Although it is not the main ingredient in baking, it is important to check because it could affect the texture of the mixtures. Brown sugar is also much nutritious to white sugar that is why it is more commonly use. The brown sugar become lumpy because when brown sugar is exposed to air it gets harder because the molasses that keeps its soft evaporates that makes the sugar stick together. The rolling pin helps the lump to break up.
Help me on these 2 science questions for brainliest pleaseeeeeee...
Answer:
Explanation:
1:) A
Mostly just use context clues
2:) D
The climate on earth is mostly due to earth's atmosphere. So, no, the moon doesn't have similar weather
QUICKLY!!!!!
1) Define the term energy.
•force applied to an object
•energy that is part of electromagnetic radiation
•stored energy
•the ability to do work
Answer:
The ability to do work is energy.
Hope it helps!!!
14. Which of the following statements about phase changes are TRUE?
Answer:
Hate to take up this answer spot, but there is no statements about phase changes.
Here are some phase changes to help: when matter changes phase. Most common ex. is water(liquid) to ice(solid). It is created by particles coming together, or spreading apart.
Brainliest?
metric conversion ( convert )
Answer:
13. 2g
14. 5000mL
15. 104,000m
16. 160mm
17. 5600000mg
18. 10hs
19. 0.250km
20. 1daL
Explanation:
13. 1000milligram (mg) = 1gram (g)
Hence, 2000mg = 2000/1000
= 2g
14. 1 litre (L) = 1000millilitre (mL)
Hence, 5L = 5 × 1000
= 5000mL.
15. 1kilometre (km) = 1000metre (m)
Hence, 104km = 104 × 1000
= 104,000m
16. 1 centimetre (cm) = 10millimeters (mm)
Hence, 16cm = 16 × 10
= 160mm
17. 1kilogram (kg) = 1000000 milligram (mg)
Hence, 5.6kg = 5.6 × 1000000
= 5600000mg
18. 1 second (s) = 0.01 hectosecond (hs)
Hence, 1000s = 1000 × 0.01
= 10hs
19. 1000metre (m) = 1kilometre (km)
Hence, 250m = 250/1000
= 0.250km
20. 1 centiliter (cl) = 0.001 Decaliter (daL)
Hence, 1000cl = 1000 × 0.001
= 1daL
What does the group number on the periodic table tell you about the electron configuration of a
representative element?
Answer:
The group number in the periodic table represents number of valence electrons of the elements in a certain group.
Explanation:
There are s, p, d, and f blocks, which you can see in periodic table
The s-block and p-block together are usually considered main-group elements, the d-block corresponds to the transition metals, and the f-block encompasses nearly all of the lanthanides (like lanthanum) and the actinides (like actinium)
There are three main principles, which may useful for you:
The Pauli exclusion rule basically says that at most, 2 electrons are allowed to be in the same orbital. Hund’s rule explains that each orbital in the subshell must be occupied with one single electron first before two electrons can be in the same orbital. The Aufbau process describes the process of adding electron configuration to each individualized element in the periodic table.Hope this helps!
How many grams in 3 moles of H2O?
How many miles in 519.3g FeCl3?
How many grams in 2 moles of Co?
Answer:
There are 54.03 grams in 3 moles of H2O
There are 3.2 moles in 519.3 g FeCl3
There are 56.0 g in 2 moles of CO
Explanation:
H2O molar mass: 18.01 g/mol
to calculate the grams: 3 mol H2O * 18.01 g/mol
FeCl3 molar mass: 162.2 g/mol
to calculate moles: 519.3g FeCl3 / 162.2 g/mol
CO molar mass: 28.01 g/mol
to calculate grams: 28.01 g/mol CO * 2 mol CO
I need some help to determine the mole and grams pls I would really appreciate the help
Answer:
[tex]n_{FeS}=0.686molFeS \\\\n_{H_2S}=23.3gH_2S[/tex]
Explanation:
Hello!
In this case, according to the given chemical reaction, it is possible to apply the following stoichiometric setups in order to compute the moles of reacting FeS and the grams of produced H2S, given the mass of HCl (molar mass = 36.46 g/mol) as shown below:
[tex]n_{FeS}=50.0gHCl*\frac{1molHCl}{36.46gHCl}*\frac{1molFeS}{2molHCl}\\\\n_{FeS}=0.686molFeS \\\\\\m_{H_2S}=50.0gHCl*\frac{1molHCl}{36.46gHCl}*\frac{1molH_2S}{2molHCl}*\frac{34.04gH_2S}{1molH_2S} \\\\n_{H_2S}=23.3gH_2S[/tex]
Best regards!
How many carbon atoms are represented by Mg(HCO3)
ANSWER ASAP
2. The figure shows the first three rows, or periods, of the periodic table. Suppose the fourth period is added. How many orbits will the Bohr models in the fourth period have? How many electrons will an atom in Group 1 in the fourth period have?
Answer:
4 orbits in the fourth period.
19 electrons in the atom from group 1 and fourth period.
Explanation:
Potassium has 19 electrons distributed in its 4 orbits
The number of periods in a periodic table, tells the number of shells or orbitals of the atoms in that row in which the electrons are filled. Thus the fourth period elements have 4 orbitals and the first element in group one of the fourth period is potassium containing 19 electrons.
What are periods in periodic table?All elements in a periodic table are classified into different groups and periods. The vertical columns in the periodic table is called groups and the horizontal rows are called periods.
A group contains elements with same number of valence electrons and similar physical and chemical properties. In a period from left to right the atomic number increases but the number of orbitals in which the electrons are filled will be the same.
Down a group the number of orbitals increases by one. Thus, each elements contains electrons in an increment of 8, 18, 18 and 32 down a group. Thus, from third period to fourth period the number of orbital increases to 4.
The number of electrons will be +8 from the previous element in the group in third period. Thus, below sodium (11) the first element in fourth period is potassium with 19 electrons.
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How many moles are there in 200 grams of carbon dioxide Please show work
According to the mole concept, there are 4.54 moles present in 200 grams of carbon dioxide.
What is a mole?Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.
It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.
It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass in grams present in one mole of atoms is its atomic mass.Number of mole= mass /molar mass which is 200/44=4.54 moles
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Which orbital is partially filled in the Zirconium (ZI) atom?
Answer:
4d orbital.
Explanation:
Hello!
In this case, since zirconium's atomic number is 40, we fill in the electron configuration up to 40 as shown below:
[tex]1s^2,2s^2,2p^6, 3s^2,3p^6,4s^2,3d^{10},4p^6,5s^2,4d^2[/tex]
Thus, the orbital 4d is partially filled.
Best regards!
13) How many moles of CH3NH2 can be produced
from 24 moles of N2?
Answer:
To answer this question we would need the Molecular empirical formula that relates the reactant of N2 to the final product of CH3NH2. Then it would be easily solved by using stoichiometric ratios. Basically it is done similar to unit conversion problems.
For the reaction between aqueous calcium nitrate and aqueous sodium hydroxide producing the precipitate (solid) calcium hydroxide and aqueous sodium nitrate
(a) write a balanced equation for this reaction
(b) classify the reaction
Answer: Ca(NO3)2(aq) + 2NaOH(aq) —> Ca(OH)2(s) + 2NaNO3(aq)
Substitution
Explanation:
The given reaction is a substitution reaction in which hydroxil group is exchanged between compounds.
Substitution Reaction:
It is a reaction in which functional group of a compound replaced by the another functional group.
For example-
[tex]\bold {Ca(NO3)_2(aq) + 2NaOH(aq) \rightarrow Ca(OH)_2(s) + 2NaNO_3(aq)}[/tex]
In the reaction hydroxil group is exchanged between compounds.
1 mole of aqueous calcium nitrate react with 2 moles aqueous sodium hydroxide to produce 1 mole of solid precipitate calcium hydroxide and 2 moles aqueous sodium nitrate.
Therefore, the given reaction is a substitution reaction in which hydroxil group is exchanged between compounds.
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In the 1860's the Central Pacific Railroad company employed the chemist James Howden to make an explosive capable of blasting through the granite mountains of the Sierras. The railroad needed tunnels for their train to pass through. James Howden built a nitroglycerin producing lab on Donner Pass where he would make the explosive compound on command. Nitroglycerin has the chemical formula C3H5N3O9. When it is detonated, it decomposes into carbon dioxide, water, oxygen and nitrogen. What is the theoretical yield for moles of nitrogen gas produced upon detonation of 1.320 tons of nitroglycerin? There are 907185 grams in 1 ton and nitroglycerin has a molar mass of 227 g/mol. Do not include decimals in your answer.
Answer:
8 × 10³ mol N₂
Explanation:
Step 1: Write the balanced equation
2 C₃H₅N₃O₉ ⇒ 6 CO₂ + 5 H₂O + 0.5 O₂ + 3 N₂
Step 2: Convert the mass of C₃H₅N₃O₉ from tons to grams
We will use the conversion factor 1 t = 907185 g.
1.320 t × 907185 g/1 t = 1.197 × 10⁶ g
Step 3: Calculate the moles corresponding to 1.197 × 10⁶ g of C₃H₅N₃O₉
The molar mass of C₃H₅N₃O₉ is 227 g/mol.
1.197 × 10⁶ g × 1 mol/227 g = 5.27 × 10³ mol
Step 4: Calculate the moles of N₂ formed from 5.27 × 10³ moles of C₃H₅N₃O₉
The molar ratio of C₃H₅N₃O₉ to N₂ is 2:3.
5.27 × 10³ mol C₃H₅N₃O₉ × 3 mol N₂/2 mol C₃H₅N₃O₉ = 7.91 × 10³ mol N₂ ≈ 8 × 10³ mol N₂
How many grams are represented by 4.20 moles of aluminum oxide?
Report your answer to proper number of significant figures and units.
Explain the order of dielectric constants for the following pairs of liquids. a) Carbon tetrachloride (2.2), chloroform (4.8) b) Ethanol (24.3) and methanol (32.6) c) Acetone (20.7) and formamide (110.0)
Answer:
See explanation
Explanation:
Let us have it behind our minds that the dielectric constant reveals the degree of polarity of a molecule. This implies that the more polar a molecule is, the greater its dielectric constant.
Chloroform is a polar molecule while carbon tetrachloride is a nonpolar molecule due to its symmetrical nature. Thus Chloroform has a greater degree of polarity and consequently a higher dielectric constant.
Methanol is more polar than ethanol because polarity of the molecule decreases as more CH2s are added to the molecule, that is, polarity of the molecule decreases with increase in the length of the carbon chain. Since methanol is more polar than ethanol, it should have a greater dielectric constant.
Again, the presence of more akyl groups in acetone makes it less polar than formamide. Consequently, formamide has a greater dielectric constant than acetone.
Help pls!!!!!!!!!!!!!
Answer:
3rd
Explanation:
50 points Two waves combine with constructive interference. What must be true of the
combined wave that forms?
A. It has a lower frequency than that of the original waves.
B. It has a higher amplitude than that of the original waves.
C. It has a higher frequency than that of the original waves.
D. It has a lower amplitude than that of the original waves.
Answer:B
Explanation:
Maybe
Answer:B is correct
Explanation:
What mass (in gram) of water would you need to have 16.0 moles of H20?
Answer:
288g
Explanation:
Given parameters:
Number of moles of H₂O = 16moles
Unknown:
Mass of the water = ?
Solution:
To solve this problem, first find the molar mass of H₂O;
Molar mass of H₂O = 2(1) + 16 = 18g/mol
Mass of H₂O = number of moles x molar mass
= 16 x 18
= 288g
ANSWER ASAP
1. Based on the patterns you observe in the figure, what do you think the number inside each box represents? What do you think the circles and dots represent?
The numbers inside the box represent the number of protons or atomic number while the circles represent the energy levels or shells in the atom. The dots represent the electrons occupying those shells.
The atomic number refers to the number of protons in the nucleus of an atom. It is shown as the number inside the boxes. It serves as the identity of an element.
The electrons occupy shells of particular energy levels according to Bohr model. The circles represent these energy levels. The dots in the circles represent the electrons that occupy those energy levels.
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Question 7 (1 point)
Order the levels of organization from smallest to largest.
11. Organism
1 2. Cell
13. Organ System
1 4. Organ
1 5. Tissue
1. Why does light bend when it changes medium?
Answer:
The bending of light as it passes from one medium to another is called refraction
Explanation:
Which types of lenses are used in glasses for a person who is nearsighted? Why is this type used?
Answer:
Concave Lenses Are for the Nearsighted, Convex for the Farsighted. Concave lenses are used in eyeglasses that correct nearsightedness.
Explanation:
5. _______H2O2 → ________ H2O + O2
a. 2, 3
b. 2, 1
c. 2, 4
d. 2, 2
6. _______ Ca + N2 → Ca3N2
a. 2
b. 3
c. 4
d. 6
7. _______Li + F2 → ______LiF
a. 2, 2
b. 2, 1
c. 2, 3
d. 2, 4
8. _______Mg + N2 → Mg3N2
a. 2
b. 3
c. 4
d. 6
9. ______NH3 → ______N2 + ______H2
a. 2, 2, 2
b. 2, 2. 3
c. 2, 3, 2
d. 2, 4, 2
10. ______HCl → H2 + Cl2
a. 2
b. 3
c. 4
d. 6
Answer:
Hope this helps! （；＿；)/
Explanation: