J.R. S.

05/06/19

The gas sample has a volume of 51.0 μL at 22.0 °C. What is the volume of the gas after the sample is cooled to 9.6 °C at constant pressure?

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05/06/19

Dilution Concentration

I am performing an experiment where I have to choose a dilution series ranging from 0.050 to 0.500. I chose 0.350, 0.250, and 0.150.The responses I give must have the same number of significant... more

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Chemistry

05/05/19

Calculation Given the Data

Substance ∆Hof (kJ/mol)CO2 (g) -393.5H2O(g) -285.8C4H10 (g) -124.7calculate the ∆Horxn for the following reaction.2C4H10 (g) + 13O2 (g) →8CO2 (g) + 10H2O (g)

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Chemistry

05/05/19

Ethanol and Molar Heat of Vaporization

The molar heat of vaporization of ethanol (38.56 kJ/mol) is larger than methanol's (35.2 kJ/mol). Provide an explanation for this difference.

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Chemistry

05/05/19

A Mass of Al is Heated

A 26.1 g mass of Al was heated to 100 Celsius and then plunged into 100 g of water at 24 Celsius. The temperature of the resulting mixture became 28.0 Celsius. What is the experimental specific... more

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Chemistry

05/04/19

How does the acidity of a water solution change after boiling? Does acidity increase because of lower water content?

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Chemistry

05/04/19

What does it mean by fixed shape for a state of matter?

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Chemistry

05/04/19

Why is an indicator unnecessary for the redox titration of Mohr's salt against acidified KMnO4?

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Chemistry

05/04/19

For a certain process, the change in Free Gibbs Energy is large and negative?

What does that indicate? Does it mean the process occurs rapidly?

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Chemistry

05/04/19

What is the correct name for the compound with the formula Cu3 (PO4)2?

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Chemistry

05/04/19

Eternal Pressure Acting on a System

What is the external pressure acting on a system that expands from 10 L to 25 L and does 210 L atm of work to the surroundings?

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Chemistry

05/04/19

Calculating Work with Moles of Gas

How much work is done by 0.86 moles of gas that has an initial volume of 10 L and expands under the following conditions: 32 Celsius and 1.3 atm.

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Chemistry

05/04/19

Calculating the Work

Calculate the work associated with the compression of a gas from 92 L to 48 L at a constant external pressure of 2.0 atm.

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Chemistry

05/04/19

Gas Absorption Question

A gas absorbs 5.3 J of heat and then performs 15.3 J of work. The change in internal energy of the gas is:

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Chemistry

05/04/19

True Statements about Processes

For a particular process, q = -20 kJ and w = 15 kJ. Which of the following statements is true?Question 4 options:The surroundings did work on the system.∆E = 35 kJHeat flows from the system to the... more

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Chemistry

05/04/19

Calories to Joules Conversion

250 Cal = ________ JHint: 1 Cal = 1 kcal= 1000 cal(1 Cal is a Food Calorie.)

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Chemistry

05/04/19

Why does 1.0 M acidic solution H3BO3 have a higher pH value than 1.0 M HNO3?

I thought strong acids reacted 100% in solution and therefore would release more H3O+ ions, making the solution more acidic than a weak acid which didn't react 100%?

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Chemistry

05/04/19

How much 10.0 M HNO3 must be added to 1.00 L of a buffer that is 0.0100 M acetic acid and 0.100 M sodium acetate to reduce the pH to 5.35 ?

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Chemistry

05/03/19

A block of aluminum with a volume of 95.3 cm3 absorbs 65.7 J of heat. Part A If its initial temperature was 34.5 ∘C, what is its final temperature? (density of aluminum =2.70 g/cm3)

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Chemistry

05/03/19

Chemistry gas laws

Mainting constant pressure, the volume of a gas is decreased from 37.5 L to 15.3 L by heating it. If the original temperature was 60.0°C, what was the new temperature? If a sample of gas occupies... more

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Chemistry

05/03/19