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a 1.00 g sample of an alloy of copper and aluminum was reacted with hydrochloric acid , and 85.0 mL of hydrogen gas (measured atSTP) was produced. Only aluminum reacts with hydrchloric acid; copper does not. What is the weight percent aluminum in the alloy?
two excited triplet states are found 13814 and 15891 cm^-1 above the ground state. calculate the Helmholtz energy for this molecule at room tempreature and 1 atm.
Determine the procedure to make 250ml of 0.1M H3PO4 from concentrated 85%(by mass) H3PO4.
The heat of solution of ammonium nitrate is 26.2 kJ/mol. If a 5.368 g sample of NH4NO3 is added to 40.0 mL of water in a calorimeter at 23.5°C, what is the minimum temperature reached by the solution.
Using Henry's law, calculate the molar concentration of in the surface water of a mountain lake saturated with air at 20 and an atmospheric pressure of 660 torr.
When the two substances reach thermal equilibrium, the final temperature is 24.2 degrees celcius. What is the mass of the copper block?
What is the molar volume of the oxygen gas at the conditions in the laboratory?
titanium metal has a body-centered circle unit cell. The density of titanium is 4.50 g/cm^3 . Calculate the edge length of the unit cell and a value for the atomic radius of titanium.
An unknown consisting of a single sugar gives a negative fermentation test. Which one of the following tests would allow you to decide which of the five sugars used in this experiment you had?
A fuel gas containing 22% CO, 13% CO and 65% N2 by volume is combusted with theoretic amount of air in a furnance to heat solid burden material.
If a chemistry student collected 834 mL of gas at 25 degrees C and 8.00 x 10^2 torr, how many moles did she collect?
is an important oxidizing agent and a moderately strong acid. in a 0.1M solution ,[H+] = 3.8x10^-2M. Calculate the Ka and the pKa for periodic acid.
What mass of HCl is consumed by the reaction of 3.84 mol of magnesium? Answer in units of g.
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