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Chapter 3: Q3.142CP (page 138)
Methane and ethane are the two simplest hydrocarbons. What is the mass % C in a mixture that is 40.0% methane and 60.0% ethane by mass?
The mass % of C in a mixture is 77.8% C.
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What is the empirical formula and empirical formula mass for each of the following compounds?
a)
b)
c)
d)
e)
The rocket fuel hydrazine (N2H4) is made by the three-step Raschig process, which has the following overall equation:
What is the percent atom economy of this process?
Nicotine is a poisonous, addictive compound found in tobacco. A sample of nicotine contains 6.16 mmol of C, 8.56 mmol of H, and 1.23 mmol of N [1 mmol (1 millimole) =10-3 mol]. What is the empirical formula?
Elemental sulfur occurs as octatomic molecules, . What mass of fluorine gas is needed to react completely with 17.8 g of sulfur to form sulfur hexafluoride?
3.16 Calculate each of the following quantities:
(a) Mass in grams of 8.35 mol of copper(I) carbonate
(b) Mass in grams of molecules of dinitrogen pentaoxide
(c) Number of moles and formula units in 78.9 g of sodium perchlorate
(d) Number of sodium ions, perchlorate ions, Cl atoms, and O atoms in the mass of the compound in part (c).
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