04/13/22

A titration between a 0.1 M strong acid and 0.1 M strong base is performed in the lab. The student stops the titration when 15 mL of the base is added to 25 mL of acid in the flask.
Determine the pH of the titration at this point. 1.781331
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04/13/22

If it takes 48 mL of 0.1 M NaOH to neutralize 125 mL of an HCI solution, what is the concentration of the HCI?
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04/13/22

Acid base titration
59.) What is the molarity of a solution of HCl if 5.00 mL of the HCI solution is titrated with 28.6 mL of 0.145 M NaOH solution? HCl(aq) + NaOH(aq) -------> NaCl(aq) + H2O(l)61.) If 38.2 mL... more
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04/13/22

chemistry - pH color change range indicator (9.21)
The color change range of the indicator methyl orange is between pH 3.2 and 4.4 and that of phenolphthalein between pH 8.2 and 10.0. In which of the following titrations can only methyl orange be... more
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04/13/22

applications of thermodynamics summary
Magnesium metal will react with an acid (hydrogen ions) in a reaction.a. write the cell diagram for this reaction b. calculate E°cellMg+2 (aq) + 2 e-1 --> Mg (s) E° = -2.37 V2 H+1 (aq) + 2 e-1... more
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04/13/22

buffer solution - chemistry
I have no idea where to start on this. Please give me a well-detailed explanation of how to solve this.Given:pKa; (CH3COOH) 4.75pKa1 (H2SO3) = 1.90pKa2 (H2SO3) = 7.20Which of the following mixtures... more
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04/13/22

For a particular reaction at 233.0 °C, Δ𝐺=−449.05 kJ , and Δ𝑆=957.70 J/K .
Calculate Δ𝐺 for this reaction at −58.6 °C.Δ𝐺=_______KJ
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04/13/22

For a particular reaction, Δ𝐻=−328.21 kJ and Δ𝑆=98.7 J/K.
Calculate  for this reaction at 298 K.Δ𝐺=_______KJ
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04/13/22

A reaction has a standard free‑energy change of −10.20 kJ mol−1(−2.438 kcal mol−1). Calculate the equilibrium constant for the reaction at 25 °C.
𝐾eq=______
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04/13/22

What is the value of 𝐾 for this aqueous reaction at 298 K?
A+B↽−−⇀C+D Δ𝐺°=15.85 kJ/molK=_______
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04/13/22

Use the molar bond enthalpy data in the table to estimate the value of Δ𝐻∘rxn for the equation C2H4(g)+HBr(g)⟶C2H5Br(g)

I am not sure how to upload a picture of the bond energy table.
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04/13/22

The solubility of lead (II) sulfate is 0.053 g/750 mL. Calculate its molar solubility.

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04/13/22

If you start with 4.25 grams of zinc, how many grams of zinc chloride will be produced?
Zn+HCI—->ZnCI2+H2
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04/13/22

At 1 atm, how much energy is required to heat 81.0 g H2O(s) at −20.0 ∘C to H2O(g) at 119.0 ∘C?

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04/12/22

How many grams of ammonia (NH3) would be produced when 35.0 grams of nitrogen react with excess hydrogen?
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04/12/22

please help chemistry

what is the density (g/L) of hydrogen gas at 20.0 c and a pressure of 1655 psi?
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04/12/22

The temperature of a metal rod drops from 95.0 °C to 26.0 °C and loses 646.9 joules of heat. Calculate the specific heat of the metal rod that weighs 75.03 g.
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04/12/22

Calculate the molarity of the Pb(NO3)2(aq) Pb ( NO 3 ) 2 ( aq ) solution.
A solution of NaCl(aq) is added slowly to a solution of lead nitrate, Pb(NO3)2(aq) Pb ( NO 3 ) 2 ⁢ ( aq ) , until no further precipitation occurs. The precipitate is collected by filtration,... more
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04/12/22

equilibrium - stoichiometry problem - chemistry
Initially, a reaction mixture contains stoichiometric amounts of H2 and I2. The reaction mixture initially contains no HI. At a temperature of 160°C, the conversion rate for the next reaction is... more
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04/12/22

chemistry - conversion rate
Solid carbon (C) and water vapor (H2O) react to form gaseous carbon monoxide (CO) and dihydrogen gas (H2). The reaction is endothermic. In a closed system, an equilibrium mixture of the four... more
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04/12/22

Which statement below best describes the behavior of an acid or base according to the Bronsted Lowry model?
An acid accepts a protonA base accepts a protonAn acid donates an electron pairA base accepts an electron pair
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04/12/22

Please help me with this question
A substance has a molar absorptivity constant of 0.233 M-1cm-1. When a sample was placed in a 1 cm cuvette and was placed in the spectrometer, it was found to have an absorbance of 0.503. What is... more
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04/12/22

Calorimetry (section 5.2)
Calculate qrxn for the reaction that occurs when 25.0 mL of 1.00 M HCl are added to 25.0 mL of 1.00 M NaOH in a coffee-cup calorimeter at room temperature (25.0o C). The final temperature of the... more
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04/12/22

PLEASE HELP WITH CHEM LIMITING REACTANTS PLEASE
Given the equation: SIO2 (s) + 4 HF (g) ---- SiF4 (g) + 2 H2O (I) If we start with 6 moles of HF and 45 grams of Si02 which is the Mass of Sf02 is 60.09 grams/mol.
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04/12/22

PLEASE help with chem limiting reactants

2 C3H8 (g) + 10 O2 (g) --- 6 CO2 (g) + 8 H2O (g) Given there are 15 grams of propane gas (C3H8) and 40 grams of o2 a.) Which is the limiting Reagent? B: how many grams of carbon dioxide are produced
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