214 Answered Questions for the topic College Chemistry

College Chemistry Chemistry

10/17/17

Calculating heat produced
When 50.0 g of 0.200 M NaCl(aq) at 24.1 °C is added to 100.0 g of 0.100 M AgNO3(aq) at 24.1 °C in a calorimeter, the temperature increases to 25.2 °C as AgCl(s) forms. Assuming the specific heat of... more
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College Chemistry Physics Ap Chemistry

10/11/17

Can you help me with this AP Chem problem? thanks
Hydrogen azide decompose on heating by the following unbalanced equationHN3=N2(g)+H2(g)If 3.0 atm of pure HN3 is decomposed initally, what is the final total pressure of the container?What are the... more
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10/08/17

Mole Fraction
A solution of Sodium Chloride in water has a vapor pressure of 26.8 torr at 30C. What is the mole fraction of NaCl in this solution? (Vapor Pressure of pure water is 31.824 torr at 30C)
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09/16/17

Hydrogen Bonding
Of these substances in the pure liquid phase which one exhibits hydrogen bonding? a) CHF3 b)CH3-O-CH3 c)H2SO4 d)all of these I'm not sure why its only H2SO4
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College Chemistry

09/14/17

What would be the final temperature if a 2kg piece of lead at 250∘C is inserted in a container with a 15kg of water at 40∘C? (for lead, c= 128 J/kg∘C)
I solved this and got 208.68 (not rounded) did I solve this correct? Because others got 34.8
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College Chemistry Chemistry

09/13/17

how many grams of solid magnesium nitrate 148.3g/mol should be added to 500ml of 0.118M of sodium nitrate in order to produce aqueous solution .25M of nitrate i
I have been stuck on this question and I'm required to show work 
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College Chemistry Chemistry

08/06/17

For a gaseous reaction, standard conditions are 298 K and a partial pressure of 1 atm for all species. For the reaction
Anybody willing to explain this to me?   For a gaseous reaction, standard conditions are 298 K and a partial pressure of 1 atm for all species. For the reaction   C2H6(g) + H2(g) <---->... more
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College Chemistry Chemistry

08/06/17

At 25 °C, the equilibrium partial pressures for the following reaction were found to be PA = 5.05 atm, PB = 5.91 atm, PC = 4.24 atm, and PD = 5.67 atm
Anybody able to help me solve this?   At 25 °C, the equilibrium partial pressures for the following reaction were found to be PA = 5.05 atm, PB = 5.91 atm, PC = 4.24 atm, and PD = 5.67... more
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College Chemistry Chemistry

08/03/17

For a particular reaction, ΔH° is -46.7 kJ/mol and ΔS° is -123.8 J/(mol·K). Assuming these values change very l
Anybody able to help and explain this problem?For a particular reaction, ΔH° is -46.7 kJ/mol and ΔS° is -123.8 J/(mol·K). Assuming these values change very little with temperature, over what... more
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College Chemistry Chemistry

08/03/17

For a particular reaction, ΔH = -99.84 kJ and ΔS = -16.80 J/K. Calculate ΔG for this reaction at 298 K.
Hello, anybody able to help me out and explain this problem to me?   For a particular reaction, ΔH = -99.84 kJ and ΔS = -16.80 J/K. Calculate ΔG for this reaction at 298 K.   What can be said... more
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College Chemistry Chemistry

08/03/17

Without referring to a data table, rank the following compounds by standard molar entropy. HF(g), F2(g), Ne(g)
Hello, would anybody be able to help me out and explain how to work this problem?   Without referring to a data table, rank the following compounds by standard molar entropy.   HF(g), F2(g), Ne(g) more
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College Chemistry Chemistry

07/29/17

Above what Fe2 concentration will Fe(OH)2 precipitate from a buffer solution that has a pH of 8.49?
Anybody willing to help me to understand this question a bit more?   Above what Fe2 concentration will Fe(OH)2 precipitate from a buffer solution that has a pH of 8.49? The Ksp of Fe(OH)2 is... more
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College Chemistry Chemistry

07/27/17

Consider the following reaction. A(aq) <--> 2B(aq) Kc = 6.04 x 10^-6 at 500K
Hello everybody I have been struggling with this and was wondering if somebody could help and explain it to me?Consider the following reaction. A(aq) <--> 2B(aq) Kc = 6.04 x 10^-6 at 500K If... more
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College Chemistry Chemistry

07/27/17

At a certain temperature, the Kp for the decomposition of H2S is 0.795. H2S(g) <--> H2(g) + S(g)
Hello everybody I have been struggling with this problem and was wondering if somebody could help and explain it to me?At a certain temperature, the Kp for the decomposition of H2S is 0.795. H2S(g)... more
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College Chemistry Chemistry

07/27/17

At what Kelvin temperature will the reaction proceed 3.00 times faster than it did at 339 K?
Help I'm struggling with this. A certain reaction has an activation energy of 29.83 kJ/mol. At what Kelvin temperature will the reaction proceed 3.00 times faster than it did at 339 K? 
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College Chemistry

07/18/17

What is the number of formula units in a 5.88 mol sample of Ca2O?
What is the number of formula units in a 5.88 mol sample of Ca2O?
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05/22/17

Give the units for the rate constants for the following rate law
Give the units for the rate constants for the following rate law:Rate = k[A]/[B].Taking into account that sometimes the other concentration units may be used (e.g. NIST Chemical Kinetics Database... more
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College Chemistry Chemistry

02/03/17

1.40 g H2 is allowed to react with 10.0 g N2, producing 2.44 g NH3.
Part AWhat is the theoretical yield in grams for this reaction under the given conditions? Part BWhat is the percent yield for this reaction under the given conditions?
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01/11/17

Hi, These are the classes I could take for my last semester of College. Which one of these classes would be less hard & stressful?
ASTM 101 - Astronomy BIOL 100 - Exploring Biology ENVS 101 - Introduction to Environmental Science CHEM 100 - Chemistry and Its Role in Society ERSC 121 - Physical Geology ARSC 103 - Natural Science
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College Chemistry

01/05/17

write each of these values as a regular number
a.  8.5 x 104g, the mass of air in an average room   b.  2.1 x 108 gallons, the volume of crude oil spilled into the Gulf of Mexico in 2010   c.  5.0 x 10-3%, the concentration of CO in the air... more
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11/25/16

Finding how high a column of water in meters can be with the density of water and mercury
I'm struggling to understand what the question is asking me and what concepts it is trying to test...    If the density of water is 1.00g/mL and the density of mercury is 13.6g/mL, how high a... more
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College Chemistry Math Chemistry Biochemistry

11/21/16

help with chemistry please!
In the reaction 2KClO3(s) --> 2KCl(s) + 3O2(g)How many liters of oxygen gas at STP are produced from 17.4 g of... more
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College Chemistry Chemistry

11/05/16

Chemistry Question
Using experimental values, place the first ionization energies in order from least amount of energy to greatest amount of energy input required: sodium, silicon, magnesium, aluminum
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College Chemistry

09/20/16

Which element would be used up first if only methionine was made?
In a substance that has 120 moles of Hydrogen, 2 moles of carbon, 58 moles of oxygen, 1 mole of nitrogen, and 1 mole of sulphur
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College Chemistry

09/09/16

I figured out the reaction table and the mass of Ag2Cro4 but I don't know how to find the molar concentration of the reamining excess reactant?
Complete a reaction table in millimoles for the reaction of 33.4 mL of 0.9500 M Ag1+ and 20.3 mL of 1.0400 M CrO42-. What mass in grams of Ag2CrO4 forms? 5.27 What is the molar concentration of... more
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