Chapter 1: 33P (page 2)
Mercury is traded by the “flask” a unit that has a mass of mercury 34.5 kg. Determine the volume of mercury if the density of mercury is 13.6 g/cm3?
The volume of the mercury flask is 2536.76 L.
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Nitrogen (N) and silicon (Si) form two binary compounds with the following composition:-
Compound Mass % N Mass % Si
1 32.28 66.72
2 39.94 60.06
(a) Compute the mass of silicon that combines with 1.000g of nitrogen in each case.
(b) Show that these compounds satisfy the law of multiple proportions. If the second compound has the formula , what is the formula of the first compound?
Suppose that an individual counts out gold atoms at the speed of 1 each second for the whole span of an 80-year life. Has the person counted enough atoms to be detected with a standard balance? Explain.
A liquid containing only hydrogen and oxygen is placed in a flask. Two electrodes are dipped into the liquid and an electric current is passed between them. Gaseous hydrogen forms at one electrode and gaseous oxygen at the other. After a time, 14.4ml hydrogen has evolved at the negative terminal, and 14.4ml oxygen has evolved at the positive terminal.
(a) Assign a chemical formula to the compound in the cell.
(b) Explain why more than one formula is possible as the answer to part (a).
The last “missing” element from the first six periods was promethium which was finally discovered in 1947 among the fission products of uranium.
Determine:
(a) The ratio of the number of neutrons in a 145Pm nucleus to the number of protons.
(b) The number of electrons in a single promethium atom.
In 1982, the production of a single atom of (Meitnerium-266) was reported. Describe the composition of a neutral atom of this isotope for protons, neutrons, and electrons?
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