Problem 38
What is the mass in grams of a single atom of each of the following elements: (a) \(\mathrm{Ag},\) (b) \(\mathrm{K}\) ?
Problem 42
Which of the following has more atoms: \(0.302 \mathrm{~g}\) of hydrogen atoms or \(14.7 \mathrm{~g}\) of chromium atoms?
Problem 44
Calculate the molar mass of the following substances: (a) \(\mathrm{Li}_{2} \mathrm{CO}_{3},(\mathrm{~b}) \mathrm{CS}_{2},\) (c) \(\mathrm{CHCl}_{3}\) (chloroform), (d) \(\mathrm{C}_{6} \mathrm{H}_{8} \mathrm{O}_{6}\) (ascorbic acid, or vitamin \(\mathrm{C}\) ), (e) \(\mathrm{KNO}_{3}\), (f) \(\mathrm{Mg}_{3} \mathrm{~N}_{2}\).
Problem 45
Calculate the molar mass of a compound if \(0.372 \mathrm{~mol}\) of it has a mass of \(152 \mathrm{~g}\).
Problem 46
How many molecules of ethane \(\left(\mathrm{C}_{2} \mathrm{H}_{6}\right)\) are present in \(0.334 \mathrm{~g}\) of \(\mathrm{C}_{2} \mathrm{H}_{6} ?\)
Problem 47
Calculate the number of \(\mathrm{C}, \mathrm{H},\) and \(\mathrm{O}\) atoms in \(1.50 \mathrm{~g}\) of glucose \(\left(\mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}\right),\) a sugar.
Problem 48
The density of water is \(1.00 \mathrm{~g} / \mathrm{mL}\) at \(4^{\circ} \mathrm{C}\). How many water molecules are present in \(15.78 \mathrm{~mL}\) of water at this temperature?
Problem 49
How many grams of sulfur (S) are needed to react completely with \(246 \mathrm{~g}\) of mercury \((\mathrm{Hg})\) to form \(\mathrm{HgS}\) ?
Problem 50
Calculate the mass in grams of iodine \(\left(\mathrm{I}_{2}\right)\) that will react completely with \(20.4 \mathrm{~g}\) of aluminum (Al) to form aluminum iodide \(\left(\mathrm{AlI}_{3}\right)\).
Problem 51
Tin(II) fluoride \(\left(\mathrm{SnF}_{2}\right)\) is often added to toothpaste as an ingredient to prevent tooth decay. What is the mass of \(\mathrm{F}\) in grams in \(24.6 \mathrm{~g}\) of the compound?
