5.117 Isoflurane, shown here, is a common inhalation anesthetic. Write its molec

Question

5.117 Isoflurane, shown here, is a common inhalation anesthetic. Write its molecular formula, and calculate its molar mass. How many moles of isoflurane arc in 3.82g? 5.118 The atomic mass of element X is 33.42 amu. A 27.22-g sample of X combines with 84.10 g of another element Y to form a compound XY. Calculate the atomic mass of Y. 5.119 How many moles of O are needed to combine with 0.212 mole of C to form (a) CO and (b) CO2? 5.120 A sample of ammonium dichromate contains 1.81 x 10^24 hydrogen atoms. How many grams of nitrogen does the sample contain? 5.121 Which of the following are ionic compounds and which are covalent compounds: RbCl, PF5, BrF3, KO2, CI4? 5.192 Classify the following substances as ionic compounds or covalent compounds containing discrete molecules: CH4, KF, CO, SiCl4, BaCI2.

Explanation / Answer

Ammonium dichromate = (NH4)2 Cr2O7

One mole of ammonium dichromate contains 8 moles of Hydrogen atoms

Hence moles of ammonium dichromate = [1.81*10^(24)/6.023*10^(23)]/8 = 0.375 moles

Moles of nitrogen in one mole of ammonium dichromate = 2 moles

Hence moles of nitrogen = 0.75 moles

Hence weight of nitrogen in gms = 0.75 * 14 = 10.5 gms

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