126 Answered Questions for the topic College Chemistry

The density an object is 3.84gr/ml,you have 332gr of it what is the volume of this sample

 I need to know the volume of the object 

Carry out the following operations and express the answer with the appropriate number of significant figures: [(285.3x10^5)-(1.200x10^3)]x2.8954

How do I solve this problem with the scientific notation? And when it comes to the rules of significant figures, do I use the rule pertaining to subtraction or the one pertaining to... more

Chemistry chemical reaction rate questions

For the reaction 4NH3 + 7O2 --> 4NO2 + 6H2O.   a.) Provide a valid expression for the reaction rate   b.) How is the rate at which O2 disappears related to the rate at which NO2 appears in... more

Chemistry 2 rate of reaction homework help

The decomposition of nitramide, NH2NO, is a first-order reaction.   a.) Write the rate law formula. b.) When starting with 0.105 M NH2NO2, with rate constant k = 5.2 x 10^-2 s^-1 at 15Celsius,... more

Question about how significant digits work in chemistry.

I'm doing my online chemistry summer class and significant digits are included, of course. But I'm confused about them because everything I believe is being contradicted. Here's what I... more

amount of heat needed to melt 45.9 g of solid ethanol and bring it to a temperature of -37.4 degrees celsius

 Calculate the amount of heat needed to melt 45.9 g of solid ethanol and bring it to a temperature of -37.4 degrees celsius. Round your answer to 3 significant digits. Also, be sure your answer... more

Chemistry Homework

Write the cell notation for an electrochemical cell consisting of an anode where Cr2+(aq) is oxidized to Cr3+(aq) at a platinum electrode and a cathode where Fe3+(aq) is reduced to Fe2+(aq) at a... more

Chemistry Homework

Write the cell notation for an electrochemical cell consisting of an anode where Cr2+(aq) is oxidized to Cr3+(aq) at a platinum electrode and a cathode where Fe3+(aq) is reduced to Fe2+(aq) at a... more

what is the empirical formula?

the compound xylene consists of 90.49% C and the rest is hydrogen.What is the empirical formula?

determine the mass of each sample

1.16 mmol carbon disulfide

determine the mass of the sample

1.48 mol carbon tetrafluoride 

What is the volume of a rock with density 3.68 and mass of 430 g?

What is the volume of a rock with a density of 3.68 g/cm3 and a mass of 430 g?

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

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

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)

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

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

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

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

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

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

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

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

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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