In the laboratory, hydrogen gas is usually made by the following reaction: Zn(s) + 2 HCl(aq) → H2(g) + ZnCl2(aq) How many liters of H2 gas, collected over water at an atmospheric pressure of 752 mm Hg and a temperature of 21.0°C, can be made from 2.566 g of Zn and excess HCl? The partial pressure of water vapor is 18.65 mm Hg at 21.0°C. a) 0.959 L b) 0.0701 L c) 0.981 L d) 0.939 L

Q: Find the km for an Michaelis-Menten kinetics enzyme. This enzyme is at 90% maximal velocity and 65mM…

A: Given the substrate concentration, [S] = 65 mM  V = 90% of maximal velocity, Vmax ⇒v = 90100xVmax⇒v…

Q: Determine the equilibrium constant for the following reaction: Ni(OH)2(s) + 2H3BO3(aq) → Ni2+ +…

A: Concept based on equilibrium constant for the sum of two or more chemical reactions. The equilibrium…

Q: Draw the major organic product of the reaction. HCI

A:

Q: Gaseous ethane (CH3 CH3) will react with gaseous oxygen (O₂) to produce gaseous carbon dioxide (CO₂)…

A:

Q: Which of the following describes the element Br? Choose all that apply. Oreacts vigorously with…

A: Answer  Bromine (Br2) is non - metal element and belongs to group 17 and 4…

Q: At STP, what is the mass 13.0 L of methane, CH4? O 27.6 g 16.0 g 0.580 g O 9.31 g

A: Given data :

Q: Consider the following equilibrium for which H = -209.7: 2 C2H6(g) + O2(g)  2 C2H4(g) + 2 H2O(g)…

A: Concept based on the chemical equilibrium of a reversible chemical reaction. Based of the change of…

Q: For the following weak base, write a Bronsted Lowry acid base reaction with water showing the…

A: Bronsted Lowry base is a proton acceptor.

Q: a. Which element has the largest atomic radius? ONa b. Which element has the largest electron…

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Q: How do I know if I had R or S phenylsuccinic acid in either R or S proline?

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Q: CH3COOH + NaCH3COO 35mL total solution 0.86M concentration of acetic acid 0.14M Concetration of…

A: Given: Total volume of the solution = 35 mL Concentration of acetic acid = 0.86 M Concentration of…

Q: Which of the following would produce a buffer? Explain your reasoning a. 10.0 mL of 0.10 M HCl +…

A:

Q: pH is a logarithmic scale used to indicate the hydrogen ion concentration, [H], of a solution: pH =…

A:

Q: If 6.00 mL of 0.4 M phosphoric acid (H3PO4) reacted with 18 mL of 0.5 M sodium hydroxide (NaOH),…

A: Limiting reagent - Reactant species which present in less amount  Excess reagent - Species which…

Q: H H Br H3C- H3C- TSO Br CH3 -CH3 CI Br + NaOCH3 Br -H -CH₂CH3 + HS (1 molar equivalent) x Br Br up…

A:

Q: What is the molar mass of sodium phosphate, Na3PO4?

A: Molar mass is the mass of 1 mole of the compound and it is represented in grams per mole.

Q: The specific heat of a certain type of cooking oil is 1.75 J/(g-°C). How much heat energy is needed…

A: Specific Heat capacity is amount of heat required to increase the temperatures of one gram of…

Q: If the ?a of a monoprotic weak acid is 7.1×10−6, what is the pH of a 0.46 M solution of this acid?

A: Recall the data, Concentration of weak acid HA=0.46 M Ka of HA=7.1×10-6

Q: When titrating 125 mL of nitric acid HNO3 0.165 mol/L, with KOH 0.219 mol/L. a) What is the pH of…

A: Answer:- This question is answered by using the simple concept of calculation of pH at different…

Q: Determine delta H* for the following thermochemical equation. Pb(s) + PbO2(s) + 2SO3(g) ->…

A: The explanation is given below-

Q: A mixture of 0.06529 mol of CH4, 0.04045 mol of H2S, 0.06585 mol of CS2, and 0.03325 mol of H2 is…

A: Given, reaction : CH4(g) + 2 H2S(g) →  CS2(g) + 4 H2(g)  CH4 = 0.06529 mol,  H2S = 0.04045 mol, CS2…

Q: H3C CH3 CH3 CH3 A) 5-40 ppm B) 40-70 ppm C) 110-160 ppm D) 165-180 ppm E) 200-210 ppm

A:

Q: Measure out 50.0 mL 1.0 M CH3COOH and 50.0 mL of 1.0 M NaCH3COO and combine them into a beaker.…

A: A buffer solution is made up of 50.0 mL of 1.0 M CH3COOH and 50.0 mL of 1.0 M NaCH3COO,  2.0 mL of…

Q: What is the solution pH when 0.10 mol of H+ is added to a 2.0-liter buffered solution created from…

A:

Q: A sample of solid silicon is heated with an electrical coil. If 133 Joules of energy are added to a…

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Q: Adding salt to your pasta water is a good way to season it before serving but how much does it…

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Q: The Haber-Bosch process is a very important industrial process. In the Haber-Bosch process, hydrogen…

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Q: When titrating 225 mL of 0.245 mol/L nitric acid HNO3 with 0.205 mol/L KOH. What is the pH of the…

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Q: Using standard heats of formation, calculate the standard enthalpy change for the following…

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Q: Br 4. Label each molecule as optically active or not optically active and why. HN S a S CH3 H CH3 HO…

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Q: How many grams of 4 Al(s) + 3 0₂(g) → 2 Al₂O3(s) Step 1: Show the strategy for solving this problem.…

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Q: When the 2.5M NaOH (15mL) solution is added to the solution of 50:50 mixture of benzophenone and…

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Q: Which of the following reactions will lead to the smallest temperature change in the calorimeter? A…

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Q: 9. What is the emf of a cell consisting of a Pb2+/Pb half-cell and a Pt/H+/H2 half-cell if [Pb²+] =…

A:

Q: Which type of electromagnetic radiation has the highest energy? Microwaves Ultra violet Radio waves…

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Q: Write the equilibrium constant expression, K, for the following reaction: If either the numerator…

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Q: Question 3 A: Nu Nu B two compounds and answer the questions that follow: Consider the following (a)…

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Q: Gaseous ethane (CH3CH3) reacts with gaseous oxygen gas (O₂) to produce gaseous carbon dioxide (CO₂)…

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Q: Match the peaks in this spectrum with hydrogens on the structure below.

A: We have to match the peaks with hydrogens in the given structure

Q: When SO₂(g) reacts with O₂(g) according to the following reaction, 98.9 kJ of energy are evolved for…

A: When the heat is evolved in the reaction, then it is called as exothermic reaction.  the sign of…

Q: Identify the relationship between these two compounds. HO H CH₂CH3 H CH3 A) enantiomers HO H CH3…

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Q: Consider the titration of 300.0 mL of 0.556 M NH3 (Kb = 1.8 ×10–5) with 0.500 M HNO3. After 150.0 mL…

A: Answer: In this question we have to find out the pH of a buffer solution made of weak base NH3 and…

Q: When NO(g) reacts with H₂(g) to form N₂(g) and H₂O(1), 376 kJ of energy are evolved for each mole of…

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Q: [References] What mass of HNO3 is present in 345.0 mL of a nitric acid solution having a pH of 5.06?…

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Q: At STP, what is the volume of 4.50 moles of nitrogen gas? 101 L O 34201 167 L 0607 L

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Q: When 1 mole of H₂CO(g) reacts with O₂(g) to form CO₂(g) and H₂O(1) according to the following…

A: Given,  Number of moles of H2CO = 1 mole   Amount of heat evolved = 563 KJ  Equation is :  H2CO (g)…

Q: The primary active component in citronella oil is 3,7-dimethylocta-2,6-dien-1-ol, C10H180. Calculate…

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Q: Suppose 100 mL of 2.0 × 10–4 M Fe(NO3)3is added to 100 mL of 2.0 ×10–5 M KIO3. What is Qsp value?…

A: when Qsp < Ksp and then compound does not precipitated. For precipitation, Qsp > Ksp

Q: NH3 is a weak base (?b=1.8×10−5) and so the salt NH4Cl acts as a weak acid. What is the pH of a…

A:

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.