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Chemistry

03/30/24

Solving a basic calorimetry problem

A 53.7g sample of aluminum, which has a specific heat capacity of 0.897 J* g^-1 * C^-1 , is put into a calorimeter (see sketch at right) that contains 200.0 g of water. The temperature of the water... more

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Chemistry

03/30/24

Concentration Of The Citric Acid Solution - Titration Data

In this titration, NaOHNaOH is the titrant, and citric acid is the analyte.Please enter your titration data below. Then, with the data on MNet, determine the volume of the analyte, citric acid, at... more

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Chemistry

03/29/24

Consider the titration of 50.0 mL of 0.325 M weak base B (Kb = 7.5 x 10⁻⁶) with 0.340 M HNO₃. What is the pH of the solution after the addition of 90.0 mL of HNO₃?

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Chemistry

03/29/24

Balance the redox reaction in acidic conditions.

Balance the following reaction using the lowest possible whole number coefficients, in acidic conditions. Bi2O4(aq) + H3PO2(aq) + H+(aq) + H2O(l) + OH−(aq) → BiO+(aq) + H3PO3(aq) + H+(aq)... more

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Chemistry

03/28/24

Calculating initial temperature of a sample

A 50.8g sample of quartz, which has a specific heat capacity of 0.730 J⋅g^-1⋅°C^-1, is put into a calorimeter that contains 200.0g of water. The temperature of the water starts off at 15.0°C. When... more

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Chemistry

03/28/24

titration, pH, and volume

Consider the titration of 100.0 mL of 0.200 M CH3NH2 by 0.100 M HCl.(Kb for CH3NH2 = 4.4×10-4)Part 1Calculate the pH after 0.0 mL of HCl added.pH = Part 2Calculate the pH after 35.0 mL of HCl... more

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Chemistry

03/28/24

Can you explain (in short) how S + P = 2SP, S + 2P = 3SP2 and S + 3P = 4SP3

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Chemistry

03/28/24

Rate law for the reaction

2A + B + 3C --> 2D + E order of the reaction respect to A,B,C?Overall order of the reactionIf C is halved how will the rate change?If B is quadrupled, how will the rate change?

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Chemistry

03/28/24

What is the rate constant, k, for the decay of carbon-14?

The wrappings from a mummy discovered in an Egyptian tomb in the Valley of Kings was dated by counting its 14C content. 14C decays by a first-order process with a half-life of 5730 years.What is... more

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Chemistry

03/27/24

2Fe2O3+C3-->4Fe+3CO2 how many tons of Fe2O3 must react with Carbon if an iron company needs to make 50.6 tons of iron

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Chemistry

03/27/24

Explain the relationship between the rate of effusion of a gas and its molar mass

Explain the relationship between the rate of effusion of a gas and its molar mass.Methane gas (CH4) effuses 3.4 times faster than an unknown gas. Determine the molar mass of the unknown gas. Show... more

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Chemistry

03/27/24

Match the action to the effect on the equilibrium position for the reaction N2(g) + 3H2(g) ⇌ 2NH3(g)

Match the action to the effect on the equilibrium position for the reaction N2(g) + 3H2(g) ⇌ 2NH3(g). (3 points) 1.Adding a catalyst a.Shift to the left 2.Adding hydrogen gas b.Shift to the... more

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Chemistry

03/27/24

Calculate the mass percent of Na3PO4.H2O in the sample

A 1.5 g sample of a mixture of solid Na3PO4.H2O mixed with NaCl, was dissolved in water, reacted with aqueous 1 M SrCl2 and 0.52g Sr3(PO4)2 precipitate was collected and dried to a constant mass.... more

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Chemistry

03/26/24

Finding the specific heat of a metal sample using calorimetry

You perform a coffee-cup calorimetry experiment using a 6.694 g metal sample. You heated the metal sample to 99.5 degrees celcius as the initial temperature with a Bunsen burner before adding it to... more

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Chemistry

03/26/24

Finding density of an unknown metal

You would like to determine the density of an unknown metal. You fill a graduated cylinder with 10.00 mL of water, add 3.11 g sample of the metal, and read the final volume in the graduated... more

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Chemistry

03/26/24

Calculate the energy in joules of a photon of red light having a frequency of 4.0x10^14 Hz.

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Chemistry

03/25/24

At 7.0ºC, the volume of a gas is 49 mL. At the same pressure, its volume is 74 mL at what temperature?

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Chemistry

03/25/24

10.0 mL of a 0.100M Ca2+ solution was buffered at pH of 10.2. Determine the pCa values after the solution was titrated with 10.00, 20.00, and 30.00 mL of 0.0500 M EDTA solution.

KCaY2- = 5.01 *10^10, alpha4 = 0.47 at pH = 10.2)

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Chemistry

03/25/24

H3PO4, please calculate the pH of the following solutions respectively: (a) 0.0250 M Na3PO4; (b) 0.000250 M of Na2HPO4; (c) 0.000250 M of NaH2PO4

Ka1 = 7.11 × 103, Ka2 = 6.32 × 108, and Ka3 = 4.50 × 1013 for H3PO4,

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Chemistry

03/24/24

Determine the pH of a buffer solution of MOPSO-H and MOPSO.

1. Determine the pH of the buffer solution that is prepared by mixing 925 mL of 0.812 M MOPSO−H (C7H15NO5S ) to 856 mL of 0.340 M MOPSO (C7H14NO5S− ). Assume the 5% approximation is valid. The pKa... more

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Chemistry

03/24/24

A galvanic cell runs for 1.0 minute with a current of 0.20 A. How much charge passed through the cell in that time? (F = 96,500 C/mol)

For Gen chem 2 electrochemistry unit!

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Chemistry

03/24/24

Standard Enthalpy Change

Given the standard enthalpy changes for the following two reactions: 1. 2Pb (s) + O2 (g) yields 2PbO (s) delta H = -434.6 2. 2Zn (s) + O2 (g) yields 2ZnO (s) delta H = -696.6 What is the standard... more

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Chemistry

03/24/24

net ionic equation for magnesium metal with aqueous silver nitrate

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Chemistry

03/24/24

Chemistry question.

Calculate the standard change in Gibbs free energy, ΔGrxn∘, for the given reaction at 25.0∘C. Consult the table of thermodynamic properties for standard Gibbs free energy of formation... more

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Chemistry Biochemistry

03/23/24

Calculate αY4- at the pH value 3.70 and pH value 10.15

EDTA is a hexaprotic system with the pKa values: pKa1= 0.00, pKa2= 1.50, pKa3= 2.00, pKa4=2.69. pKa5= 6.13, pKa6=10.37.The distribution of the various protinated forms of EDTA will therefore vary... more

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Solving a basic calorimetry problem

Concentration Of The Citric Acid Solution - Titration Data

Consider the titration of 50.0 mL of 0.325 M weak base B (Kb = 7.5 x 10⁻⁶) with 0.340 M HNO₃. What is the pH of the solution after the addition of 90.0 mL of HNO₃?

Balance the redox reaction in acidic conditions.

Calculating initial temperature of a sample

titration, pH, and volume

Can you explain (in short) how S + P = 2SP, S + 2P = 3SP2 and S + 3P = 4SP3

Rate law for the reaction

What is the rate constant, k, for the decay of carbon-14?

2Fe2O3+C3-->4Fe+3CO2 how many tons of Fe2O3 must react with Carbon if an iron company needs to make 50.6 tons of iron

Explain the relationship between the rate of effusion of a gas and its molar mass

Match the action to the effect on the equilibrium position for the reaction N2(g) + 3H2(g) ⇌ 2NH3(g)

Calculate the mass percent of Na3PO4.H2O in the sample

Finding the specific heat of a metal sample using calorimetry

Finding density of an unknown metal

Calculate the energy in joules of a photon of red light having a frequency of 4.0x10^14 Hz.

At 7.0ºC, the volume of a gas is 49 mL. At the same pressure, its volume is 74 mL at what temperature?

10.0 mL of a 0.100M Ca2+ solution was buffered at pH of 10.2. Determine the pCa values after the solution was titrated with 10.00, 20.00, and 30.00 mL of 0.0500 M EDTA solution.

H3PO4, please calculate the pH of the following solutions respectively: (a) 0.0250 M Na3PO4; (b) 0.000250 M of Na2HPO4; (c) 0.000250 M of NaH2PO4

Determine the pH of a buffer solution of MOPSO-H and MOPSO.

A galvanic cell runs for 1.0 minute with a current of 0.20 A. How much charge passed through the cell in that time? (F = 96,500 C/mol)

Standard Enthalpy Change

net ionic equation for magnesium metal with aqueous silver nitrate

Chemistry question.

Calculate αY4- at the pH value 3.70 and pH value 10.15

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