Chemistry Answers

Consider the element Uranium, U. Determine which isotopes are naturally occurring. Look up the masses of each isotope in amu, and the natural abundances. Calculate the average atomic weight, and compare this to what you find in the periodic table. Given the atomic mass numbers of the isotopes, is the atomic mass number consistent with these atomic mass numbers? Why or why not? If it seems inconsistent, can you explain this apparent inconsistency

A pycnometer, nominally 10 ml, was found to have a volume of 9.9872 ml, when filled

exactly to the top of the capillary in the stopper. The pycnometer was filled with benzene

(an organic liquid), and weighed. The mass of the filled pycnometer was found to be

21.8743 g. The pycnometer empty was weighed, and found to have a mass of 13.1455 g.

Calculate the density of the benzene. Compare this to the density of benzene at 25.0 0C

that you find in the literature

how many nitrogen molecules are in a box measuring 9.00cm H x 21.00cm L x 14.50cm W

Explain why carbon monoxide is sometimes a product of an alkane combustion

reaction.

You need to make an aqueous solution of 0.195 M barium bromide for an experiment in lab, using a 500 mL volumetric flask. How much solid barium bromide should you add?

If a = 0.244 atm-L²/mole²,and b = 0.0266L/mole, find the weight of H₂ stored in a 100-cm³ cylindrical tank at 100^oC and 100 atm ( or 10, 132.5 KPa) by using (a) the ideal gas equation (b) the van der Waals equation.

** to solve for the mass of H2, use the successive approximation method

A 5.0 L ballon has a pressure of 1.0 atm at sea level, where the temperature is 28°C. The balloon was let loose and ascended to a height in the temperature where the temperature is 11°C. What will be the volume of the balloon if the atmospheric pressure at the new altitude is 0.65 atm?

draw the tripeptide efh in its predominant ionization state at ph 5

1. Calculate the ionic strength of a 0.02 M solution of Al2(SO4)3

2.99 • 10⁸