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In a concentration calculation, if we are given the solute measurement in grams, and the volume of solution in liters, what do we need to do first in order to find the molarity? A. Find the mass of
How many calories are required to warm 15.0 g of water from 75 C to 100.0 C and convert it to steam at 100.0 C? The heat of vaporization of water is 540 cal/g.
What is the net ionic equation for the reaction that occurs when a small amount of hydrochloric acid is added to the buffer?
Use the bond dissociation energies of H2 (435 kj/mol) and of y typical carbon-carbon bond (347 kj/mol) to decide which bond is stronger, and explain why?
What is the minimum weight, in grams, of this compound that must be added to 10 kg of water to produce a solution that will protect an automobile cooling system from freezing at -20 ºC?
A student in lab has 3.00 g of pure N2 in 0.541 g pure H2. The reaction happens following this equation: N2(g) + 3H2(g) → 2NH3(g) How many grams of NH3 would be produced?
Two kinds of carbonyl acceptor structures in addition to benzoate esters can be used in reaction with phenylmagnesium bromide to afford triphenylmethanol. What are they?
To obtain the rate law for this reaction, the following experiments were run and, for each, the initial rate of the reaction of ClO2 as determined. Obtain the rate law and the value of the rate cons
with this in mind, explain the reason for the sequence of addition of the ether solution employed at the beginning of the formation of the Grignard reagent in the experimental procedure above.
A solution of ethanol (C2H5OH) in water is prepared by dissolving 63.0 mL of ethanol (density = 0.79 g/cm3) in enough water to make 255.0 mL of solution. What is the molarity of the ethanol in this
The density of aluminum is 2.7 g/cm3. An ecology-minded student has gathered 126 empty aluminum cans for recycling. If there are 21 cans per pound, how many grams of aluminum does the student have?
This precipitate was then strongly heated in a stream of Cl2 gas to convert the AgI to AgCL,upon completion of this treatment,the precipitate weighed 0.3181g. calculate the percentage of chloride an
Ethyl alchol (a liquid) C2H6O, burns in air to producce carbon dioxide and gaseous water.
Derive an expression for the compression factor of a gas that obeys the equation of state P(V - nb) = nRT, where b and R are constants. If the pressure and temperature are such that V =
We are taught that the gases do not have a specific volume, but they occupy all the space that is given to them. Why do we say that 1mol of an ideal gas occupies 22,4L in STP? How is that possible?
If the de Broglie wavelength for an electron in a hydrogen atom is 3.31times 10^{-10}~rm m, how fast is the electron moving relative to the speed of light? The speed of light is 3.00times10^8 ~rm m/
Use average bond energies to calculate Delta H_{{rm{rxn}}} for the combustion of methane ({rm{CH}}_4 ).
Use Charles Law to solve for the missing value of each of the following 80.0 mL, T1= 27 degrees C, T2=77 degrees C. V2 =?
An automobile gasoline tank holds 49 of gasoline. When the gasoline burns, 172 of oxygen are consumed and carbon dioxide and water are produced.What is the total combined mass of carbon dioxide and
A toothpaste contains 0.24 % by mass sodium fluoride used to prevent dental caries and 0.30 % by mass triclosan {rm C_{12}H_7Cl_3O_2}, a preservative and antigingivitis agent. One tube contains 119
The hydrogen gas generated is collected over water at 25.0°C. The volume of the gas is 535 mL measured at 1.00 atm. Calculate the number of grams of sodium used in the reaction. (Vapor pressure
Both the reduced and oxidized derivatives of [CuII(H2))6]2+ show no tendency to distort. Explain why there would be no driving force for theses derivatives to distort, by drawing the corresponding d
Calculate the heat released when 1.95 L of Cl2(g) with a density of 1.88 g/L reacts with an excess of sodium metal at 25°C and 1 atm to form sodium chloride.
Calculate the concentrations of Fe3+, SCN -, and FeSCN2+ in a solution that is initially 2.0 M FeSCN2+.
If the partial pressure of NO is decreasing at the rate of 32 torr/min, what is the rate of change of the total pressure of the vessel?