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By Jerome Rosenberg, Lawrence Epstein, Peter Krieger

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Additional resources for College Chemistry

Example text

Ans. 84. A water-stabilized electric arc was reported to have reached a temperature of 25,600◦ F. On the absolute scale, what is the ratio of this temperature to that of an oxyacetylene flame (3500◦ C)? Ans. 85. Construct a temperature scale in which the freezing and boiling points of water are 100◦ and 400◦ , respectively, and the degree interval is a constant multiple of the Celsius degree interval. 6◦ C)? Ans. 86. 5◦ F. The expected temperature drop under the conditions in the apartment is 1◦ C for each hour and 15 minutes after death.

904. What value was obtained for the atomic mass of Zr from this experiment? Ans. 20. 2984 g of Na2 CO3 with sulfuric acid. 4380 g. In this reaction, all sodium in the starting material (Na2 CO3 ) appears in the product (Na2 SO4 ). Calculate the atomic mass of sulfur from this experiment. Ans. 017 24 ATOMIC AND MOLECULAR MASS; MOLAR MASS [CHAP. 21. 9045. Explain. Ans. The atomic masses indicated on the Periodic Table of the Elements are averages, but they are calculated relative to the mass of 12 C.

This problem is different from the previous problems because percent compositions were not provided; instead, we are to work with a mass of the hydrated salt and are given the mass of the anhydrous (without the water) salt. We can set up the tabular solution using these data. 391 and leads to the whole-number ratio required to write a chemical formula. 99, a number that is so close to a whole number that the difference can be taken for experimental error. The mole ratio of Na2 SO4 to H2 O is 1 to 7, providing us with an empirical formula of Na2 SO4 · 7H2 O.

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