The aqueous solution here would freeze at -9.163 degree celsius.
The temperature at which it boils is 375.60 K. This gets converted into Celsius = 102.45-degree Celsius (i)
The standard temperature of boiling is = 100 degree Celsius (ii)
The standard temperature of freezing is = 0 degrees celsius (iii)
We know the formula -
Depression in cooling/ Elevation in boiling = [tex]K_{b}[/tex] / [tex]K_{f}[/tex] (iv)
The standard values for both Ks are 0.5 and 1.87 respectively. (v)
Using the given values of (i), (ii), (iii), (iv), and (v), we find that -
= (102.45 - 100.00) / (0 - x) = 0.5 / 1.87
x, here is the temperature for freezing.
= Temperature at which it freezes = - 9.163 degree Celsius.
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A typical Heliox mixture contains He at a partial pressure of 0.75 atm and O2 at a partial pressure of 0.35 atm. What is the total pressure of the Heliox mixture?
Considering the Dalton's partial pressure, the the total pressure of the Heliox mixture is 1.1 atm.
Dalton's partial pressureDalton's law states that the total pressure of a gas mixture is equal to the sum of the pressures that each gas would exert if it were alone:
[tex]P_{T}[/tex]= P₁ +P₂ + ... + Pₙ
where n is the amount of gases present in the mixture.
This relationship is due to the assumption that there are no attractive forces between the gases.
Total pressure of the Heliox mixtureIn this case, the total pressure of the Heliox mixture is calculated as:
[tex]P_{T} =P_{He} +P_{O_{2} }[/tex]
Being:
[tex]P_{He}[/tex]= 0.75 atm[tex]P_{O_{2} }[/tex]= 0.35 atmthe total pressure of the Heliox mixture is
[tex]P_{T}[/tex]= 0.75 atm + 0.35 atm
[tex]P_{T}[/tex]= 1.1 atm
Finally, the total pressure is 1.1 atm.
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what type of quantitative chemical method was used to determine the precise concentration of hydroxide in the experiment?
The type of quantitative chemical method was used to determine the precise concentration of hydroxide in the experiment is titration.
Titration is quantitative chemical method used to determine the concentration of unknown solution by using the known concentration of solution. the solution with the known concentration is called as the titrant. the solution of the unknown concentration is called as analyte. titrant is added from burette to known quantity of solution of unknown concentration that is analyte until the reaction is complete.
Thus, The type of quantitative chemical method was used to determine the precise concentration of hydroxide in the experiment is titration.
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short note on sodium permutit
Explanation:
permutit is an artificial zeolite chemically it is
hydrated sodium aluminum orthosilicate with the formula
Na2AI2Si208. XH20
Determine which base will work to deprotonate each compound in an acid/base extraction.
Bases that are useful for deprotonating compounds are:
NaHCO₃ or NaOH.
metal alkoxide
Sodium hydroxide
Benzene rings with carboxylic acids that are weak acids can be prepared using NaOH or NaHCO 3 due to the weakness of the carboxylic acid. deprotonated.
Metal alkoxides such as potassium tert-butoxide can be used to deprotonate benzene rings with three carbon chains attached to one carbon. Also, metal alkoxides are used because the benzene ring containing the hydroxyl group is a very weak acid.
A benzene ring with a hydroxyl group is a weak acid like a benzene ring with a carboxyl group, so it can be deprotonated with NaOH.
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give 4.5 moles of cr and 6.0 moles of n2, how many grams of cr2n3 (mw 146 g/mol) can be formed? 4 cr 3 n2 --> 2 cr2n3
Cr is the limiting reagent & the amount of Cr2N3 produced depends on the limiting reagent.
2 mol of Cr produces 146g of Cr2N3
1 mol ———————- 146/2g of Cr2N3
4.5 mol ——————- 146 x 4.5/2g of Cr2N3
=328.5g of Cr2N3
What is a Limiting Reagent?
The limiting reactant is the reagent (compound or element) to be totally consumed in a chemical reaction. Limiting reactants is also what prevents a reaction from continuing because there is none left.Thus, 328.5 g of cr2n3 can be formed.
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How is a covalent structure formed
which french chemist noticed that uranium salts could fog photographic plates, even without being exposed to sunlight?
In March 1896 Antione Henri Becquerel (French chemist) discovered that the uranium mixture would introduce radiation even if it was not exposed to an exposed light.
UraniumHenri Becquerel made a chemical compound of the element Uranium (potassium uranyl sulfuric acid crystals) and produced a light glow around it. This compound is then placed on a dry photographic plate wrapped in thin black paper. It turns out that this light causes sensitivity to the dry plate photo
In 1896, Becquerel accidentally discovered radioactivity while observing the phosphorescence of uranium salts, a discovery by Wilhelm Rontgen. X-rays used a cathode-ray tube to produce X-rays. Becquerel wondered whether X-rays could not be produced by exposing ordinary sunlight to non-metallic substances. Coincidentally, Becquerel also discovered for the first time that this new type of radiation would be transmitted by any uranium chemistries. Since the radiation did not depend in any way on the chemical form of the uranium, Becquerel realized that the radioactivity was not of chemical origin, but had to be from the uranium atoms themselves.
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when atoms react, they often lose, gain, or share electrons to form a more stable version of themselves. for example, alkali metals such as na lose their outer shell electron in their reactions to form compounds. the electron configuration of alkali metals would then resemble those of which group of the periodic table in the compounds they form?
Answer: The alkali metals will lose an electron to resemble the next lowest noble gas; thus, all the alkali metals form +1 ions. K loses an electron so that it will have the same electron configuration as Ne.
1A or group 1
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The electron configuration of alkali metals would then resemble those of group 17 of the periodic table in the compounds they form.
What is periodic table?Periodic table is defined as a tabular approach of showing the items so that they appear in the same vertical column or group when their attributes are similar. Phosphorus is the oldest chemical element, and hassium is the newest. Please take note that, unlike in the Periodic system, the elements do not exhibit their natural relationships with one another.
The elements that make up group 17 of the periodic table are the halogens. They are nonmetals that are reactive, such as iodine, bromine, chlorine, and fluorine. Halogens are non-metals that are very reactive. These substances share a lot of characteristics with one another.
Thus, the electron configuration of alkali metals would then resemble those of group 17 of the periodic table in the compounds they form.
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the half-life of the reaction in trial 4 is less than the half-life in trial 1. explain why, in terms of activation energy.
Trial 4's half-life of the reaction is shorter than Trial 1's half-life. Because the activation energy and half life are both precisely related. In comparison to trail 4, trail 1 activation energy is higher.
A reaction's t1/2, or half-life, It occurs when the concentration of a reactant is halved from its starting concentration. T1/2 is used to represent it.
Activation energy is the required amount of energy to start the reaction. Kilojoules per mole (kJ/mol) is the unit used to measure the activation energy (Ea) of a reaction. Activation energy is the force that causes an object to begin acting in a certain way or to start a specific process.
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9. Which of the following are diatomic elements?
Bromine
lodine
Boron
Hydrogen
Explain why you selected the rock you did in Question 1. Which characteristics helped you make a decision?
You take in that you need to make a decision. Try to notice and define the nature of the decision you must make. This first step is very important.
What are the first characteristics of decision-making?Decision-making requires the identification and selection of alternatives on the basis of values, linking, requirements, and beliefs. To begin the procedure objectives must be defined, classified, and ordered in the order of their importance. Decision-making involves the recognition and selection of alternatives on the basis of values, preferences, concerns, and beliefs. Decision-making means selecting a course of action from two or more alternative strategic decision-making (SOM) is of great and growing importance.
So we can conclude that attribute of Decision Making · It is a process of selecting a course of action from among the alternative courses of action.
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consider one glucose unit in glycogen. what is the overall or net reaction for the conversion of this unit into 2 pyruvate, starting with phosphorolysis of the glucose unit?
This cycle is known as Glycolysis
Glycolysis is the 10 step process, which occurs in cytoplasm of cell and is conversion of glucose to pyruvate.
There are several steps and enzymes that is required in glycolysis pathway.
STEP 1: PHOSPHORYLATION
This is irreversible reaction.
Here glucose is phosphorylated to glucose 6 phosphate with the help of enzyme hexokinase and 1 ATP is utilized.
STEP 2 : ISOMERISATION
The isomerization of Glucose-6-phosphate to Fructose-6-phosphate, done with the help of enzyme phosphoglucoisomerase.
STEP 3 : SECOND PHOSPHORYLATION
Fructose-1,6-bisphosphate is phosphorylated to Fructose 1,6 bisphosphate which is catalyzed by phosphofructokinase and cost another ATP.
STEP 4: BREAKDOWN
The fructose-1,6 bisphosphate is breaken down too produce two 3carbon molecules - Glyceraldehyde-3-phosphate, or GADP, and a molecule of Dihydroxyacetone phosphate or DHAP.
The reaction is catalyzed by aldolase.
STEP 5 : CONVERSION OF DHAP INTO GADP
DHAP is oxidized to form GADP.
The reaction is catalyzed by triose phosphate isomerase enzyme.
STEP 6: OXIDATION
Here 2 mol. of GADP are oxidized.The GDAP is converted to 1,3 bisphosphoglycerate with the help of glyceraldehyde phosphate dehydrogenase. This requires NAD+ and a free phosphate.
STEP 7: DEPHOSPHORYLATION
First substrate level phosphorylation ( addition of phosphate to ADP to give ATP )
1,3 bisphosphoglycerate with the help of Phosphoglycerate kinase become 3-phosphoglycerate and will produce 1 ATP.
STEP 8: PHOSPHATE TRANSFER
The phosphate ester linkage in 3 phosphoglycerate is moved from 3 C to 2 , because of low free energy to form 2 phosphoglycerate with the help of phosphoglycerate mutase .
STEP 9: DEHYDRATION
2 phopshoglycerate is dehydrated by enolase to form Phosphoenolpyruvate ( PEP)
This is reversible reaction.
STEP 10: SECOND DEPHOSPHORYLATION
2 substrate level phosphorylation which gives out ATP.
Non - oxidative phosphorylation.
Here Phosphoenolpyruvate ( PEP) is converted to last product of glycolysis pyruvate releasing ATP by pyruvate kinase.
The first five step is production of GADP, And usage of ATP and the next five steps are the formation of ATP and pyruvate. The net formation of ATP is 2 mol. of ATP and 2 mol. of NADH. This pyruvate then move to the TCA cycle.
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3 straight chains of 12 carbon atoms are shown. 2 oxygen atoms are at the end of each row and connect the carbon atoms to a row of 3 carbon atoms. each carbon atom is attached to hydrogen atoms. which type of lipid is shown? a saturated phospholipid a saturated triglyceride an unsaturated phospholipid an unsaturated triglyceride
Three straight chains containing 12 carbon atoms, 2 oxygen atoms at the end is a saturated triglyceride.
What are saturated triglycerides?
Saturated triglycerides contain entirely of carbon-carbon single bonds in the structure. They have higher melting point compared to unsaturated triglycerides. Consuming saturated triglycerides in the large amount may lead to several cardiovascular diseases. Foods with high concentration of saturated triglycerides are butter, some fatty meats and cheese.
The saturated triglycerides are made up of carbon-carbon single bonds containing maximum number of hydrogen atoms. Unlike, saturated fats, unsaturated fats have carbon-carbon double bonds in them.
Therefore, 3 straight chains containing 12 carbon atoms, 2 oxygen atoms at the end is a saturated triglyceride.
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the expected stoichiometry is 1:1. how does your result compare (calculate the % error between your mole ratio and the expected value)?
Stoichiometry is the representation of balanced chemical equation, that involves the amount or quantities of reactants and products involved in the reaction.
In a chemical equation, stoichiometry is the relation between two or more substances. Stoichiometry can be the definite proportions in which elements or compounds react with one another. The rules followed in calculating the stoichiometric relationships are based on the laws of conservation of mass and energy and the law of combining weights or volumes.
For example:
N2 (g) + 3H2(g) → 2NH3(g)
In the above reaction, Nitrogen (N2) and Hydrogen (H2) react to form Ammonia (NH3).
1 molecule + 3 molecules = 2 molecules
There is another concept known as the stoichiometric coefficient, this gives us the number of molecules that are participating in the reaction.
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describe the relationship between the colors that we see with our eyes and the colors of light that the dye molecules absorb most strongly
The relationship between the colors that we see with our eyes and the colors of light that the dye molecules absorb most strongly is because of its wavelength
When a molecule interact with light and energy is absorbed and the molecule is said to be excited and the transition occurs which take the molecule from an initial state to a higher energy state and if wavelength of light from a certain region of the spectrum are absorbed by a material then the material will appear to be the complementary color and if violet light with wavelength of 400nm is absorbed then the material will look yellow and if the material absorbs blue then the orange color are seen
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atoms from which of the following pairs are most likely to form an ionic bond? a) carbon and oxygen b) silicon and oxygen c) sodium and oxygen d) sulfur and oxygen
Atom pairs that are most likely to form an ionic bond is sodium and oxygen.
Thus, the correct option is C.
What is an ionic bond?А pаir of elements will most likely form аn ionic bond if one is а metаl аnd one is а nonmetаl. These types of ionic compounds аre composed of monаtomic cаtions аnd аnions. We cаn check the periodic tаble to see thаt the cаtions аre monаtomic ions formed from metаls, аnd the аnions аre monаtomic ions formed from nonmetаls.
Sodium is a metal, and oxygen is a nonmetal; therefore, [tex]N_{2} O[/tex] is expected to be ionic.
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does a change in temperature affect the solubility of nh3? if yes, at which temperature would nh3 be most soluble? does pressure change has effect on the solubility of nh3? if yes, at which pressure would nh3 be most soluble?
Yes as the temperature increases the solubility of NH3 will decrease and as we increase the pressure solubility of NH3 increases.
Solubility is defined as the maximum amount of substance that will dissolve in a given amount of solvent at a given or specified temperature. Based on solubility different types of solutions can be obtained. A saturated solution is a solution where a saturated solution is a solution where a given amount of solute is completely soluble in the solution.
Whereas a supersaturated solution are those where solute starts precipitating out after a certain concentration.
Temperature does effect the solubility of NH3 because as the temperature increases the hydrogen bonding also decreases, due to which the NH3 molecules are no longer able to bind to water molecules hence their solubility decreases.
But as we increase the pressure on NH3 molecules the bonding with the water molecules will be higher and therefore the solubility also increases.
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when the ionic solute k3po4 is dissolved in water, what can you say about the number of potassium ions present in the solution compared with the number of phosphate ions in the solution?
We can say that When K3PO4 is dissolved in water , the number of potassium ions present in the solution is three times the number of phosphate ions in the solution .
What are Ionic compounds ?
Ionic compounds can be defined as ionic bonds or chemical bonds formed by oppositely charged ions held together by electrostatic forces.
These are usually formed between metals and non-metals. Atoms always tend to acquire stable electronic configurations when atoms lose electrons to form cations, and anions are formed when atoms gain electrons. These two oppositely charged atoms together form an ionic bond, which is called an ionic bond.
Ionic compounds, also called ionic compounds, are held together by electrostatic forces. Ionic compounds are also formed when the electronegativity difference between two atoms is large. This causes one atom to attract more electrons than the other, resulting in electron loss and electron gain within the atom.
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what is the iupac name for the compound shown? a six carbon ring with an oxygen atom double bonded to one of the carbon atoms in the ring.
cyclohexanone is the compound which is shown.
what is cyclohexanone-
The chemical substance known as cyclohexanone has the formula (CH2)5CO. The compound is a six-carbon cyclic molecule with a functional group called a ketone.
IUPAC (International Union of Pure and Applied Chemistry) nomenclature is based on the naming of a molecule's longest chain of carbons connected by single bonds, whether in a continuous chain or in a ring.
six-carbon ring with oxygen bonded to one of the carbon atoms in the ring is cyclohexanone.
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Select the statement(s) that accurately describe what a pedigree chart shows.
A. Future predictions of inherited genes
B. Specific alleles being inherited by offspring
C. Inherited traits in a family
D. Male and female family members
E. Genotypes and phenotypes being inherited
A pedigree chart shows Inherited traits in a family; the correct option is C
What is a pedigree chart?A pedigree chart is a chart that shows how traits are passed on from parents to offspring.
A pedigree chart is used in the study of inheritance or genetics.
A pedigree chart can for example be used to study the inheritance pattern of traits such as sickle cell anemia. In such a pedigree chart, the genotype of the parents is used to study how the trait is being transferred and can also predict the likelihood of the offspring of the parents inheriting that trait.
A pedigree chart can also be used to backtrace how a particular trait came into a particular family.
In conclusion, a pedigree chart is a chart that shows how traits are passed on from the parents and offspring of a family.
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if the solubility of iron (iii) hydroxide is 1.49e-10 moles/liter, what is the ksp of iron (iii) hydroxide?
Mo Iron's polarity is calculated. Hydroxide. Thus, we must translate this into moles. One additional F b o H 30 H will get you to Surrey. Over 2.80 L, the molar mass was 5.8 grams.
Working out at 1.40 times 10 to the minus 52.80 times 10 to the minus five. I'll get either 1.1 or 1.1.10 multiplied by 10 to the negative 14. Put the KSP value into action.
What is Hydroxide ?A diatomic anion with the chemical formula OH is hydrogen oxide. It has a negative electric charge and is made up of two atoms of oxygen and hydrogen that are bound together by a single covalent bond. It is a crucial yet typically insignificant component of water. It serves as a base, ligand, nucleophile, catalyst, and nucleophile.
If the pOH of the solution is known, it is possible to determine the hydroxide ion concentration in an aqueous solution, [OH-], in mol L-1. The amount of hydroxide ions in the solution decreases as the pOH rises. The amount of hydroxide ions in the solution rises as the pOH drops.
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Solution X has a pH of 8, and Solution Y has a pH of 3.
Which option describes Solution X and Solution Y?
Responses
Solution X and Solution Y are both bases.
Solution X and Solution Y are both bases.
Solution X is an acid, and Solution Y is a base.
Solution X is an acid, and Solution Y is a base.
Solution X and Solution Y are both acids.
Solution X and Solution Y are both acids.
Solution X is a base, and Solution Y is an acid.
Answer:
Solution X is a base, and solution Y is an acid
Explanation:
PH for acidic is 1 to 6
PH for neutral is 7
PH for alkaline is 8 to 14
you are given two samples of elements, and each sample has a mass of 10 grams. if the number of atoms in each of these samples is the same, what must be true of the two elements?
The must be true of the two elements is All of the above.
An element is a substance composed of only one type of atom that cannot be broken down into simpler substances by either physical or chemical processes. They are divided into metals, non-metals, and semi-metals. Helium is the element with atomic number 2 in the periodic table. Each helium atom has two protons in its nucleus.
The atomic weight of the element is 4.0026. Helium is known as a gas in its pure form because it does not combine easily. A compound is a unique substance formed by the chemical combination of two or more elements. Compounds are formed through chemical reactions. Elements of a compound are held together by chemical bonds.
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silicon nitride (si3n4) is made by a combining si and nitrogen gas (n2) at a high temperature. how much (in g) si is needed to react with an excess of nitrogen gas to prepare 125 g of silicon nitride if the percent yield of the reaction is 95.0%?
The amount of Si needed to react with an excess of nitrogen gas to prepare 125g of silicon nitride if the percent yield of the reaction is 95% is 88.20 g.
We know that,
Percentage (%) yield = ( actual yield /theoretical yield ) × 100
Using this we can derive that,
Theoretical yield = (Actual yield / Percentage(%) yield) × 100
= (125 / 85) × 100 = 147.06g Si₃N₄
The mole ratio of Si: Si₃N₄ = 3 :1
Grams of Si required to produce 147.06 g Si₃N₄,
= ( 3 mole Si /1 mol Si₃N₄) ( 28.05 g Si /1 mole Si) * (1 mole Si₃N₄, /140.3 g Si₃N₄,) *147.06 g Si₃N₄
= 88.20 g Si
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Chromium (Cr) can combine with chlorine (Cl2) to form chromium chloride (CrCl3).
Which equation is a correct representation of this reaction?
Responses
2Cr + Cl2 → CrCl3
2 upper case C lower case r plus upper case C lower case l subscript 2 end subscript rightward arrow upper case C lower case r upper case C lower case l subscript 3 end subscript,
Cr + Cl2 → CrCl3
upper case C lower case r plus upper case C lower case l subscript 2 end subscript rightward arrow upper case C lower case r upper case C lower case l subscript 3 end subscript,
2Cr + 3Cl2 → 2CrCl3
2 upper case C lower case r plus 3 upper case C lower case l subscript 2 end subscript rightward arrow 2 upper case C lower case r upper case C lower case l subscript 3 end subscript,
2Cr + 3Cl2 → CrCl3
The combination of the chlorine and the chromium species is designated by the reaction [tex]2Cr + 3Cl_{2} ------- > 2CrCl_{3}[/tex]. Option B
What is the correct representation?We know that the term reaction has to do with the way in which two atoms are combined in a compound. Now, the reaction must be balanced. This implies that the number of atoms on the reactant side must be the same as the number of atoms on the products side.
We are talking about how to write the reaction between the chromium atom and the chlorine atom. We know that we have to find out which of the reaction is balanced and that is; [tex]2Cr + 3Cl_{2} ------- > 2CrCl_{3}[/tex]
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ammonia burns in the presence of a copper catalyst to form nitrogen gas. what is the enthalpy change to burn g of ammonia?
The given question is incomplete and the complete question is
Ammonia burns in the presence of a copper catalyst to form nitrogen gas. 4 NH3(g) + 3 O2(g) → 2 N2(g) + 6 H2O(g) ΔΗ = -1267 kJ What is the enthalpy change to burn 38.4 g of ammonia?
Ammonia burns in the presence of a copper catalyst to form nitrogen gas. 4 NH3(g) + 3 O2(g) → 2 N2(g) + 6 H2O(g) ΔΗ = -1267 kJ and the enthalpy change to burn 38.4 g of ammonia is
Ammonia means NH₃ is one of the most commonly produced industrial chemical
Here given data is
ΔΗ = -1267 kJ
And the balanced reaction is
4 NH₃(g) + 3O₂(g) → 2N₂(g) + 6H₂O(g)
We have to calculate enthalpy change to burn g of ammonia = ?
First calculate the moles corresponding to 38.4 g NH₃
The molar mass of NH₃ is 17.03 g/mol
38.4 g ×1mole/17.03 g/mol = 2.25 mol
Then calculate the enthalpy change to burn 2.25 mol of ammonia
And according to the thermochemical equation 1267 kJ are released per 4 mole of ammonia that react
2.25 mol×(-1267kJ/4 mol) = -713 kJ
Enthalpy change to burn 38.4 g of ammonia is -713 kJ
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work is entropy free, and sometimes the claim is made that work will not change the entropy of a fluid passing through an adiabatic steady-flow system with a single inlet and outlet. is this a valid claim?
Work is entropy free and it does transfer entropy but the claim is not valid, the entropy of a fluid passing through an adiabatic steady state system with a single outlet and inlet can change due to irreversibilities present in the system during the process.
What is entropy?
Entropy is a measure of the disorder of a system.Entropy also describes how much energy is not available to do work.The more disordered a system and the higher the entropy, the less of a system's energy is available to do work.Why doesn't entropy change when there is a work transfer?
We have two grades of energy i.e high-grade energy and low-grade energy. High-grade energy is directly utilized by us like potential energy and kinetic energy. On the other hand, low-grade energy can't be utilized by us directly, it is first converted into high-grade energy eg- heat.According to the second law of thermodynamics low-grade energy can't be completely converted into high-grade energy, there is always some loss associated with it. But high-grade energy can be completely converted into low-grade energy.To know more about entropy:
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What can you say to the movie san andreas you've watch?
It appears that your answer contains either a link or inappropriate words. Please correct and submit again!
This is what it keeps saying when I want to answer so I have commented my answer below:
water dissolves salts because it: select one: a. is hydrophobic, and salts are also hydrophobic. b. forms covalent bonds with the atoms of the salt crystal. c. has partial positive and negative charges. d. evaporates quickly at room temperature.
Salts get dissolved in water because it has partial positive and negative charges. So option (c) is correct.
Why does salt dissolves in water?The water molecules pull the Na and Cl ions apart while breaking the ionic bond which held them together. After the salt ions are pulled apart, they get surrounded by water molecules. The salt dissolves to form a homogeneous solution.
The slightly positive portion of sodium is attracted to the slightly negative portion of oxygen on the water molecule. At the same time, the slightly electronegative chlorine moieties of NaCl are attracted to the slightly electropositive hydrogen moieties of water.In either case, no true bond is formed, the stronger covalent bonds of water (also commonly held by hydrogen bonds between water molecules) win, NaCl gets pulled apart, resulting in dissociation of Na+ and Cl- ions with the Na+ and Cl- ions setting loosely in place between the intact H₂O molecules. NaCl is then dissolved.Salts are ionic and are expected to dissolve in water because water itself is polar. Therefore, ionic salts are expected to dissolve in polar solvents.
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explain why it is not necessary to weigh the flask and the unknown volatile liquid before the initial heating.
As per this case the test tube will be heated so the unwanted gas will be wiped out and only the vapors of our gas will sustain in the flask
what are flasks used for?
There are different types of flasks used in chemistry laboratories they are mainly used for weighing chemicals, preparing stock solutions, preparing reacting solutions and many more.
The test tube will only contain the vapour that is necessary to compute the molar mass because, as you heat this gas, you are producing enough vapour to drive away the air and keep the liquid's vapour present. so that there is no need to weigh the flask before heating the volatile liquid
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