04/14/20

pH solving for buffer
Calculate the pH of a buffer solution made by combining 20.00 mL of 1.0 M NaOH with2.00 mL of 17.5 M acetic acid (HC2H3O2, pKa = 4.74) and then enough DI water to obtain a final volume of 200.0 mL.
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04/14/20

Le chateleirs principle
Based on Le Chateleir’s Principle If sodium chloride were added to your saturated solution of sodium sulfide, what would happen to the molar solubility 
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04/14/20

Net ionic equation help
Write the net ionic equation for the dissociation of lead (II) sulfate in water.
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04/14/20

Which statement is correct and explain
The standard reduction potential for halogens are given belowHalogens Standard Reduction Potential at 25 oC I2(s) + 2 e– → 2 I–(aq) +0.535Br2(l) + 2 e– → 2 Br–(aq) ... more
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04/14/20

CHEM Lab Help On Vinegar lab
Malonic acid, H C H 04 (aq), is a diprotic acid, so 2 moles of hydroxide ions are required per mole of malonic acid for complete neutralization. Calculate the mass percent concentration of malonic... more
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04/14/20

Chemistry problem related to a dumas bulb experiment

An organic volatile solvent analyzed by a combustion analysis is 85.63% C and 14.37% H. In a Dumas bulb experiment, a 2.174-g sample of that compound’s vapor occupies 1.00-L volume at 120.0oC and... more
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04/14/20

How many grams of potassium carbonate K2CO3 are needed to make 200 mL of a 2.5 M solution? Give me the number of moles then the number of grams.

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04/14/20

What is the concentration of a 450 mL solution that contains 1.58 moles of iron (II) chloride?
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04/14/20

standard cell potential and is it spontaneous under standard state conditions?
Calculate the standard cell potential for each reaction below, and note whether the reaction is spontaneous under standard state... more
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04/14/20

Identify the oxidant and reductant in each reaction
I just need question 15, thank you!14. Balance each reaction below, and write a cell schematic representing the reaction as it would occur in a galvanic cell.(a)... more
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04/14/20

Identify the oxidant and reductant of each reaction
I need number 7, but if you could do 6 too than that would be great!6. Balance the equations below assuming they occur in a basic solution.(a)... more
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04/13/20

im not sure how to format this answer can someone please help me?
Write the cell notation for an electrochemical cell consisting of an anode where H2(g) is oxidized to H+(aq) at a platinum electrode and a cathode where Fe3+(aq) is reduced to Fe2+(aq) at a... more
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04/13/20

The half-life of sodium 24 is 15.7 hours. How long will it take for 68.1% of a 5.5 μg sample to decay?

This is a first order process. Report answer in hours to two decimals.
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04/13/20

How many milliliters of 0.700 M HNO3 are required to reach the stoichiometric point of the reaction?
Consider the titration of 300.0 mL of 0.700 M NH3 (Kb = 1.8 ´ 10–5) with 0.700 M HNO3. How many milliliters of 0.700 M HNO3 are required to reach the stoichiometric point of the reaction?
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04/13/20

Chemistry Combined Gas Laws
Consider 4.80 L of a gas at 365 mmHg and 20.C  . If the container is compressed to 3.00 L and the temperature is increased to 38 C , what is the new pressure, , inside the container? Assume no... more
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04/13/20

What is the specific heat of a substance that absorbs 2.5 x 103 joules of heat when a sample of 1.0 x 104 g of the substance increases in temperature from 10.0C to 70.0°C?
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04/13/20

What is the mass of a sample of zinc that absorbed 198.5 joules of energy when heated from an initial temperature of 234°C to 439°C? The specific heat of aluminum is .388J/g°C.

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04/13/20

A balloon filled with CO2 travels from Flag to Phoenix. If the balloon started at 1.49 atm and went to 1.2 atm, what is the new volume if the balloon has an initial volume of 0.460 L?
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04/13/20

A gas at 27°C and 1x103mmHg is cooled in a 3.9 L flask. After its cooled the temp is measured at 11°C. Given that the final pressure was 1.098x103mmHg, what is the new volume of the gas

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04/13/20

Chemistry question

80.0g of I2O5 reacts with 25.0g of CO. If 40.61g of I2 are produced from the reaction, what is the % yield for the reaction.I2O5 + 5CO → 5CO2 + I2a)How many moles of iodine should have been... more
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04/13/20

Chemistry Boyle's Law
Sometimes the problem will give the initial and final states in different units. In this case, you need to identify all of the pressures and all of the volumes by organizing them into a table (step... more
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04/13/20

Chemistry- Boyle's Law
Once you’ve identified the initial and final conditions, you’re ready to solve for the unknown quantity in your problem. Boyle’s Law expresses the pressure-volume relationship as P1V1=P2V2 , so you... more
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04/13/20

chemistry question
For a particular isomer of C8H18, the combustion reaction produces 5099.5 kJ of heat per mole of C8H18(g) consumed, under... more
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04/13/20

chemistry question
Calculate the standard enthalpy change for the reaction at 25 ∘C. Standard enthalpy of formation values can be found in this list of thermodynamic properties.C3H8(g)+5O2(g)⟶3CO2(g)+4H2O(g)ΔH∘rxn =... more
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04/13/20

chemistry question
Using the standard enthalpies of formation, what is the standard enthalpy of reaction?CO(g)+H2O(g)⟶CO2(g)+H2(g)ΔH∘rxn = _____kJ
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