Synthetic Inorganic Chemistry
NOTES AND PROBLEMS 51
- The composition of the above substance is found by
analysis to be: carbon, 45.87 per cent; hydrogen, 3.21 per
cent; and bromine, 50.92 per cent. Calculate the formula of
the substance.
- A certain compound of chlorine and copper is found to
have the composition: copper, 64.2 per cent; chlorine, 35.8
per cent. When 0.52 gram of this substance is heated to
a sufficiently high temperature to convert it completely into
a gas, it takes the place of a certain volume of air. This
amount of air is found to measure 58.8 cc. under standard
conditions. Calculate the molecular weight and the chemi-
cal formula of the compound.
- A liquid substance has the composition: carbon,
12.76 per cent; hydrogen, 2.13 per cent; bromine, 85.11 per
cent; and when vaporized its vapor density is 93.3 times
that of hydrogen. Calculate the molecular weight and the
formula of the compound.
- The chloride of a new element contains 38.11 per cent
of chlorine and 61.89 per cent of the element. The vapor
density of the compound referred to air is 12.85. What is
the atomic weight of the element as far as investigation of
this one substance can give it?
- Cyanogen contains 46.08 per cent carbon and 53.92
per cent nitrogen. Its density is 1.796 times that of air.
Calculate its formula.
- In a current of pure oxygen in a combustion tube 0.5000
gram of a substance is burned. The products of combustion
are passed through a calcium chloride tube which weighs
36.5011 and 36.7824, respectively, before and after the ex-
periment. Find the percentage of hydrogen in the substance.
- The products of combustion in Problem 27 are further
passed through a tube containing caustic soda, and this weighs
40.4010 and 42.1184 grams, respectively, before and after the
experiment. Find the percentage of carbon in the substance.
- The above substance is converted into a vapor at 273°,
and 0.100 gram is found to occupy a volume of 34.9 cc. at
760 mm. Find the molecular weight of the substance.
- From the results calculated in Problems 27, 28, and 29
find the formula of the substance.
