10/08/23

Given the following reaction below, how many grams of H2O (MM = 18.02 g/mol) can be formed from 7.234 grams of C12H26 (MM = 170.34 g/mol)? 2 C12H26 (g) + 37 O2 (g) → 24 CO2 (g) + 26 H2O (g)
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10/08/23

How much methanol, in grams, must be burned to produce 683 kJ of heat?
When methanol, CH3OH, is burned in the presence of oxygen gas, O2, a large amount of heat energy is released. For this reason, it is often used as a fuel in high performance racing cars. The... more
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10/07/23

In the laboratory you dissolve 24.9 g of aluminum sulfate in a volumetric flask and add water to a total volume of 125 . mL.
In the laboratory you dissolve 24.9 g of aluminum sulfate in a volumetric flask and add water to a total volume of 125 . mL.
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10/06/23

Weak buffer solution titrated with a strong base
A 50.0 mL sample of buffer solution contains 0.120 M acetic acid and 0.150 M sodium acetate.If 5.55 mL of 0.092 M NaOH is added to this solution, identify the resulting number of moles of acetic... more
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10/06/23

Calculate the pH of the base solution after the chemist has added 5.7 mL of the HNO3 solution to it.
An analytical chemist is titrating 63.6 mL of a 0.1800M solution of diethylamine ((C2H5)2NH) with a 0.6300M solution of HNO3 The pKb of diethylamine is 2.89. Calculate the pH of the base solution... more
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10/06/23

Calculate the pH of the solution at equivalence.
A chemist titrates 90.0 mL of a 0.2315M pyridine (C5H5N) solution with 0.6080M HBr solution at 25 °C. Calculate the pH at equivalence. The pKb of pyridine is 8.77.Round your answer to 2 decimal... more
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10/06/23

BIOCHEMISTRY-Reaction Velocity Question
For an enzyme that obeys Michaelis-Menten kinetics, what is the reaction velocity, V, observed at the following substrate concentrations?Express the result as a percentage of Vmax.(a) If [S] = KM,... more
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10/05/23

Calculate the pH at equivalence.
A chemist titrates 70.0 mL of a 0.5369 M potassium hydroxide (KOH) solution with 0.6871M HCI solution at 25 °C. Calculate the pH at equivalence.Round your answer to 2 decimal placesyou may assume... more
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10/05/23

Calculate the pH at equivalence.
A chemist titrates 160.0 mL of a 0.0730M nitrous acid (HNO2) solution with 0.6587 M KOH solution at 25 °C. Calculate the pH at equivalence. The pKa of nitrous acid is 3.35Round your answer to 2... more
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10/05/23

Calculate the pH of the base solution

An analytical chemist is titrating 149.5 mL of a 0.3500 M solution of methylamine (CH3NH2) with a 0.6100M solution of HNO3. The pKb of methylamine is 3.36. Calculate the pH of the base solution... more
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10/05/23

Calculate the pH of the acid solution

An analytical chemist is titrating 189.7 mL of a 0.2900 M solution of butanoic acid (HC3H7CO2) with a 0.6900M solution of NaOH. The pKa of butanoic acid is 4.82. Calculate the pH of the acid... more
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10/05/23

Calculate the pH
An analytical chemist is titrating 241.4 mL of a 0.2300M solution of cyanic acid (HCNO) with a 1.200M solution of NaOH. The pKa of cyanic acid is 3.46.Calculate the pH of the acid solution after... more
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10/04/23

0.2192 g of calcium hydroxide, Ca(OH)2, in 43.75 mL of solution
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10/04/23

Precipitation Titration of CoCl2 with NaOH
How to tackle the following questions: "Calculate the moles, and mass (theoretical yield), of the precipitate that you were expecting to collect based on the product being Co(OH)2. Again, if you... more
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10/04/23

brackets or paschen
if a radiation of 2000 nm was observed for hydrogen, does it fall under bracket or paschen series
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10/04/23

Chemistry equilibrium concentration

Kc= 1.25 x10^-72CIF «»(equilibrium) Cl2 + F2What are the equilibrium concentrations of all species present? (I know that the quadratic function won’t be used because the kp is very very small so my... more
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10/03/23

Calculate the grams of H2 consumed if 87 g of ammonia is produced according to the reaction: N2 + 3H2 - 2NH3

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10/02/23

Chemistry equilibrium concentration

A mixture of 3.51 mol N2 and 35.21 g NO is heated in a closed vessel to 2000C. After heating, the total pressure of the mixture at equilibrium is 3.14 atm. Calculate the equilibrium partial... more
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10/01/23

 how many nutritional Calories are there per gram of the candy?
A researcher studying the nutritional value of a new candy places a 6.60 g sample of the candy inside a bomb calorimeter and combusts it in excess oxygen. The observed temperature increase... more
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10/01/23

The heat capacity (calorimeter constant) of the calorimeter is 34.85 kJ/ ∘C, what is the heat of combustion per gram of the material?
A 2.333 g sample of a new organic material is combusted in a bomb calorimeter. The temperature of the calorimeter and its contents increase from 25.17 ∘C to 30.62 ∘C.The heat capacity (calorimeter... more
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09/30/23

Convert a CaCL2 standard with a concentration of 8.40 mg/dL to mEq / L.
You added 400 mg of NaHCO3 to 500 mL of diluent, what is the molarity of this solution? Convert a CaCL2 standard with a concentration of 8.40 mg/dL to mEq / L.
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09/29/23

What is the maximum mass of S8 that can be produced by combining 83.0 g of each reactant?
What is the maximum mass of S8 that can be produced by combining 83.0 g of each reactant?8SO2+16H2S⟶3S8+16H2O mass of S8: ? g
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09/29/23

Using the data in the table, calculate both the mass and volume of n‑butyl alcohol required to completely react with 220.0 L of acetic acid.
As part of a team of chemists at a food flavoring company, you need to produce n‑butyl acetate (C6H12O2), a sweet-smelling food additive that occurs naturally in apples, pears, and bananas. Your... more
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09/29/23

Complete the table below.

Conjugate acid Conjugate Base formula Ka formula Kb ______ _____ C5H5N 1.7 x 10-9 H2CO3 4.5 x 10-7 _____ _____ HCN 4.9 x 10-10 _____ _____ Round each of your entries... more
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09/28/23

Combustion analysis of an unknown compound containing only carbon and hydrogen produced 2.277 g of CO2 and 1.161 g of H2O. What is the empirical formula of the compound?
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