To measure the amount of calcium carbonate CaCO3  in a seashell, an analytical chemist crushes a  4.300g  sample of the shell to a fine powder and titrates it to the endpoint with  605.mL  of  0.100M  hydrogen chloride  HCl  solution.   The balanced chemical equation for the reaction is: 2HClaq + CO2−3aq + H2CO3aq -> 2Cl−aq   Calculate the mass percent of CaCO3 in the sample.

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Q: A weak base has K₁ = 7.7 × 10−¹0. What is the value of K₂ for a the conjugate acid? Ka =

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Q: A reaction at -6.0 °C evolves 420. mmol of carbon monoxide gas. Calculate the volume of carbon…

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Q: Solid sodium reacts with liquid water to form hydrogen gas according to the equation 2 Na(s) + 2…

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Q: Enter your answer in the provided box. For the reaction N₂(g) + 3H₂(g) = 2NH3(g) Kp is 2.79 x 105 at…

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Q: 3. How are the following compounds related? Confirm by assigning R/S to each chiral center. CH OH НО…

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Q: calculate the lattice energy of NaCl:

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A: Given,  ∆Hsoln, NaOH  = - 44.3 kJ/mol  ∆Hsoln, KOH = - 56.0 kJ/mol  NaOH added = 5.00 g  KOH added =…

Q: 1. HgOAC₂, H₂O 2. NaBH4

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Q: SOH SOCI2 H2O, H+ EtOH, H Да CI Дон

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Q: Write the equilibrium constant in terms of activities for the chemical reaction of fire…

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Q: Consider the following equilibrium for which AH SO₂(g) + Cl₂(g) → SO₂Cl₂(g) How will each of the…

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Q: 2. Create a graph that shows what mass of fermium-252 remains after each of its first five…

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Q: 1. Determine the pH when 5.89 g of sodium acetate is dissolved in 190 mL of water. Ka of acetic Na +…

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Q: What is the volume of a Stock 2M Tris solution needed to prepare 600 ml of150 mM Tris?

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Q: Suppose 11.1g  of lead(II) acetate is dissolved in  350.mL  of a  0.80 M  aqueous solution of…

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Q: What is the relationship between free-energy change for a reaction and it's equilibrium constant?

A: Relation between free energy change and equillibirium constant can be given as:

Q: Provide a Type 2 Electrophilic Addition reaction (including detailed mechanism)

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Q: What compound is the expected product upon Markovnikov hydrohalogenation with HBr of the alkene…

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Q: 100- 80- eb 40 28 4898 302 са Hо 02 3500 2939.89 3030 12 क 2828.88 2739.27 m 10.0 9.5 9.0 8.5 8.0…

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Q: HQ حكمة Ho هده

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Q: 0.505 mol of a weak acid, HA, and 13.3 g of NaOH are placed in enough water to produce 1.00 L of…

A: Given - Moles of weak acid(HA)= 0.505mol  Weight of NaOH=13.3g  Volume=1.00L  pH=4.27 Ka of HA=?

Q: Oxygen gas please state the electronic and molecular geometries of the following molecules

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Q: How grams of C4H8 is needed to completed 30.00 Liter of oxygen gas

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Q: 4. In the reaction between 1-butene and HCI which carbon is the H+ added to? Explain your answer.

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Q: Determine the pH of each of the following solutions.

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Q: Calcium bydride, Calfy, reacts with water to form hydrogen gas. Cal₂(s) + 2 H₂O()→ Ca(OH)₂(aq) + 2…

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Q: Suppose 5.53g  of sodium chloride is dissolved in  100.mL  of a  0.50 M  aqueous solution of…

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Q: Draw the major product of this reaction. Include stereochemistry if applicable. Ignore byproducts.

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Q: Find all the IR Peak Assignment and NMR Peak Assignment

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Q: What is the pH of a buffer solution if you dissolve 300 ml of 1.65M Formic Acid (HCO2H) and 250 ml…

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Q: 138.0 g acetylene (ethyne) exists as a liquid at T = -84 °C, which is the liquid's boiling point.…

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Q: b) The measured voltage at 298K of a cell described by the equation below takes place at the…

A: Ecell = 0.293 V Cd (s) + Pb2+ (aq, 0.150 M) -----> Pb(s) + Cd2+ (aq, 0.0250 M)

Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".