Calculations involving Mass (e) The percentage of a particular element in a compound can be calculated as follows: % element mass of element mass of compound x 100% Example 1: Find the % composition of sodium and chlorine in 18.50g of NaCl if the mass of sodium in the sample is known to be 7.20g

Q: Which of the following is a conjugate acid-base pair? A) H3ASO4, AsO, B) H2ASO, HASO,2- C) H2ASO.,…

A: Which of the following is conjugate acid - base pair ?

Q: Which statement is INCORRECT regarding the titration of a weak acid with a strong base? HA+ OH AT+…

A: The incorrect statement about the titration of weak acid with strong base is given below

Q: Which of the following is suitable to use when forming grignard reagent

A: Grignard reagent has general formula of R/Ar-MgX , where R is an alkyl group and Ar is an aromatic…

Q: Salance the nuclear equation and identify the missing symbol. 235U →? + Cs +4,n O 148 Xe 54 151 134…

A: Balance the nuclear equation and identify the missing symbol---

Q: Rank the following bond angles from least to greatest: OH A<B<C<D OD<C<B<A A<C<B<D OD<B<C<A

A: We know angle made by bond A is largest= 180° and D is smallest. Hence our answer should either be…

Q: SOCI, 1. Mg/ether 3,4-dimethyl-1-hexanol pyridine 2. H,0 Cro/ H,SOJH,O OH %3D II OH он IV

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Q: Nombre Ciclohexanol Ácido Fosfórico Ciclohexeno Agua Forma Molecular C6H120 H3PO4 C6H10 H20 Р.М.…

A: Density = Mass / Volume So, Mass = Density * Volume Also, No of moles = Mass / Molar mass

Q: st" under the one which would be soluble in water. Writeeast" under the one which would be least…

A: Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: A mixture of 8.05 moles of A, 10.36 moles of B, and 27.16 moles of C is placed in a one-liter…

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Q: Medical Air refers to a clean supply of compressed air used in hospitals and healthcare facilities…

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Q: Identify the atoms that contain a formal charge of -1. O Both oxygens O The chlorine O The nitrogen…

A: identify the atoms that contain a formal charge of -1 ?

Q: Laboratory Task Based on alcohol, phenol, and ether, and previous notes on electrophilic aromatic…

A: Here we have to explain why boiling point of diethyl ether is less than butan-1-ol.

Q: Rank the following based on their molar solubility: Cd3(AsO4), Be(OH)2, Cu3(AsO4)2

A: Molar solubility is directly related to solubility product.

Q: Predict the major organic product for the following reaction: CI NaOC(CH3)3 HOC(CH3), ox B C.

A: The haloalkane undergo elimination reaction to form alkene as the major product.

Q: Calculate the concentration of F in solution and its absolute uncertainty. nt figures are graded for…

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Q: Precise measurements give the following masses: nuclide mass particle mass 239. 94 Pu 239.0522 u on…

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Q: Q-I: Determine the product(s) of the rxn and llustrate the mechanism. Alcl3 ? Q-II: Determine which…

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Q: Question 3 What is the standard molar entropy change of the following reaction? 8 NH3(g) + 10 O2(g)…

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Q: When acid is added to a color indicator, it changes from purple to pure blue at a pH = 5.75. When…

A: Concept:  Acid-base indicators: They are chemicals used to determine whether an aqueous solution is…

Q: that the [Formic acid] By mixing formic acid and sodium formate a buffer solution was prepared in a…

A: Given-  Formic acid= Formate ion

Q: Consider the molecule below. Of the indicated bonds, which would be expected to exhibit the lowest…

A: We have to find the bond with the lowest stretching frequency.

Q: calculate calorimeter constant to 2 significant figures

A: Given that -  Temperature of cold water = 3.0°C  Temperature of hot water = 89.0°C  Volume of cold…

Q: The freezing point of a 0.21m aqueous solution of H2SO4 is -0.796oC. a. What is i?

A: Given, Molality of aqueous solution of H2SO4 = 0.21 m Freezing point of the solution (Tf(solution))…

Q: i. CH4 + H20 → CO2 + H,0 j. NH3+ Cu0 → Cu + N2 + H20

A: Balance the following chemical reactions---

Q: How much heat will be absorbed when 13.7 g of nitrogen reacts with excess O2 according to the…

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Q: Ba(OH), is a strong electrolyte. Determine the concentration of each of the individual ions in a…

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Q: Q-I: Determine the product(s) of the rxn and llustrate the mechanism. AlCl3 Q-II: Determine which…

A: We have given the product of the reaction with mechanism. Q-I:

Q: Using s rd reduction potentials from the ALEKS Data tab, calculate the standard reaction free energy…

A: Using equation: ∆G0=  -nFE0 cell  ∆G0 = standard Gibbs free energy  n = no. of electron in that…

Q: Match the molecular ion (from electron impact mass spectrometry) with the correct compound. (Make…

A: We have the identity the compound from the given molecular ion peak at 122.

Q: Which one of the these tests (2,4-DNP, 'H NMR, or IR) could you use to distinguish between…

A: We have to tell which of these tests are used to distinguish between acetonitrile and acetic acid.…

Q: The standard reaction free energy AG" =-910. kJ for this reaction: 6 C(s) + 6 H,(g) +…

A: we need to calculate the value of delta G for the given reactions in the table

Q: 25.0 ml of 0.50M HA (Ka = 3.0 x 10-7) is titrated with 0.45M NaOH. Calculate the pH at the endpoint.

A: We need to find the pH at the end point for the given titration

Q: 1. A. For the following reaction predict the sign of H2(g) → 2H(g) negative negative negative AHrxn…

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Q: Transamination involves the of an amino group from an amino acid to an alpha-keto acid, while…

A: Transfer, removal.

Q: What is the molar solubility of PbCl, in 0.018 M Pb(NO,), solution? Use table of the linear…

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Q: I. Draw the structure of the main product of the following Deactions. Include stereoshemistry, in…

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Q: Show the correct equation of Gas law,the variables and what is held constant for the law

A: Gas law relates the pressure, volume and temperature of a gas with each other.

Q: A 15.00 g sample containing mixed alkali and other inert components was dissolved and diluted to 300…

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Q: Lhoose which of the following has the least4S°. Omolten brass (alloy of Cu and Zn) Omethane aqueous…

A: The correct answer about entropy is given below

Q: What ion would stronium replace in hydroxylapatite?

A: We have to tell the ion which is replaced by stronium in hydroxylapatite.

Q: A chemical engineer is studying the two reactions shown in the table below. In each case, he fills a…

A: Value of ∆G or ∆S can be calculated using relation :  ∆G = ∆H - T∆S  A reaction is Spontaneous if ∆G…

Q: What ion would stronium replace ir hydroxylapatite?

A: The effect of partial substitution of Ca2+ in hydroxyapatite by Sr2+ on bone mineral content (BMC)…

Q: The standard reaction free energy AG° = - 190. kJ for this reaction: CH3OH(g) + CO(g) -»HCH3CO2(l)…

A:

Q: Hydrogen-3 is radioactive and has a half life of 12.3 years. How long would it take a sample to…

A: Given that -  Hydrogen-3 is tritium which is a radioactive isotope with half life = 12.3 years…

Q: A galvanic cell at a temperature of 25.0 °C is powered by the following redox reaction: Mno, (s) +…

A: The given redox reaction is, MnO2(s)+4H+(aq)+2Cr2+(aq)→Mn2+(aq)+2H2O(l)+2Cr3+(aq) The overall…

Q: 1. Provide the missing starting material, reactant or product. Show appropriate stereochemistry. а)

A:

Q: Laboratory Task Based on the video lecture on alcohol, phenol, and ether, and previous notes on…

A: Diethyl ether is an organic compound with an ether functional group: attached to ethyl groups…

Q: Glucose (molar mass=180.16 g/mol) is a simple, soluble sugar. Glucose solutions are used to treat…

A: Molar concentration is the ratio of number of moles of solute to volume of solution in liters.…

Q: Show the steps necessary to transform the compound on the left into the compound on the right

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Q: 23. Ringer's injection contains 0.86% of so- dium chloride, 0.03% of potassium chlo- ride, and…

A: Given that -  Mass percentage of NaCl = 0.86%  Mass percentage of KCl = 0.03%  Mass percentage of…

Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.