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Scientists estimate that the CO2 concentration in the atmosphere was 750 ppm during the Cenzoic era. If one ignores acid/base equilibria in solution, calculate the concentration of CO2 in the ocean during the Cenzoic era.
A sample of helium gas initially at 37.0 degrees C, 785 torr and 1.50L was heated to 65.0 degrees C while the volume expanded to 3.24 L. What is the final pressure in atm.
The temperature of a 35.2 g sample of iron increases from 23.7 C to 29.5 C. If the specific heat of iron is 0.450 J/g-K, how many joules of heat are absorbed.
PVA (polyvinyl alcohol) strands can form hydrogen bonds between different parts of the same strand. Illustrate how this can occur by using a sketch to show the hydrogen bonding.
Assuming that the density of the solution is 1.0 g/mL, find the molarity of the hydrogen ion in the solution. The molar mass of HCl is 36.5 g/mol
28.98 mL of a 0.1962 mol/L EDTA solution is required to titrate a sample to the equivalence point. How many moles of divalent metal cations were in your sample?
All of the carbon atoms in the ring of carbon atoms of the benzene molecule are double bonded to each other. All of the carbon atoms in the ring of carbon atoms of the benzene molecule are single bonded to each other.
A 28.7 g sample of ethylene glycol, a car radiator coolant, loses 652 J of heat. What was the initial temperature of ethylene glycol if the final temperature is 32.5°C (c of ethylene glycol = 2.42 J/gK)
the active ingredient in toothpaste is sodium fluoride an anticavity agent. a 170 g tube of toothpaste lists the
1.2 mol of helium is mixed with 2.3mol of argon in a volume of 1.0L and a temperature of 25.0 degree C. Assuming that helium and argon are perfect gases, what is the pressure of the mixture
Explain the broader melting point range observed for the second sample. The reported melting point for the compound is 143 degree C.
The analysis of this compound shows that it contains 41.8 percent C, 4.7 percent H, 37.3 percent O, and 16.3 percent N. Calculate the molecular formula of the compound.
Calculate the pressure that must be applied in order to increase its density by 0.08 percent.
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