Problem 60
How many atoms of hydrogen are found in \(2.31 \mathrm{~mol}\) of propane, \(\mathrm{C}_{3} \mathrm{H}_{8} ?\)
Problem 61
What is the total number of \(\mathrm{C}, \mathrm{H},\) and \(\mathrm{O}\) atoms in 0.260 moles of glucose, \(\mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6} ?\)
Problem 62
What is the total number of \(\mathrm{N}, \mathrm{H},\) and \(\mathrm{O}\) atoms \(\mathrm{in}\) \(0.356 \mathrm{~mol}\) of ammonium nitrate, \(\mathrm{NH}_{4} \mathrm{NO}_{3}\), an important fertilizer?
Problem 63
Calcium carbide, \(\mathrm{CaC}_{2},\) was once used to make signal flares for ships. Water dripped onto \(\mathrm{CaC}_{2}\) reacts to give acetylene \(\left(\mathrm{C}_{2} \mathrm{H}_{2}\right)\), which burns brightly. One sample of \(\mathrm{CaC}_{2}\) contains \(0.150 \mathrm{~mol}\) of carbon. How many moles and how many grams of calcium are also in the sample?
Problem 64
Iodized salt contains a trace amount of calcium iodate, \(\mathrm{Ca}\left(\mathrm{IO}_{3}\right)_{2},\) to help prevent a thyroid condition called goiter. How many moles of iodine atoms are in \(0.500 \mathrm{~mol}\) of \(\mathrm{Ca}\left(\mathrm{IO}_{3}\right)_{2}\) ? How many grams of calcium iodate are needed to supply this much iodine?
Problem 66
How many moles of nitrogen, \(\mathrm{N},\) are in \(0.556 \mathrm{~mol}\) of ammonium nitrate? How many grams of this compound supply this much nitrogen?
Problem 67
How many kilograms of a fertilizer made of pure \(\left(\mathrm{NH}_{4}\right)_{2} \mathrm{CO}_{3}\) would be required to supply 1 kilogram of nitrogen to the soil?
Problem 69
Calculate the percentage composition by mass for each element in the following: (a) \(\mathrm{NH}_{4} \mathrm{H}_{2} \mathrm{PO}_{4}\) (c) sodium dihydrogen phosphate (b) \(\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CO}\) (d) calcium sulfate dihydrate
Problem 71
Which has a higher percentage of oxygen: morphine \(\left(\mathrm{C}_{17} \mathrm{H}_{19} \mathrm{NO}_{3}\right)\) or heroin \(\left(\mathrm{C}_{21} \mathrm{H}_{23} \mathrm{NO}_{5}\right) ?\)
Problem 72
Which has a higher percentage of nitrogen: carbamazepine, an anticonvulsant, \(\left(\mathrm{C}_{15} \mathrm{H}_{12} \mathrm{~N}_{2} \mathrm{O}\right)\) or carbetapentane, a cough suppressant, \(\left(\mathrm{C}_{20} \mathrm{H}_{31} \mathrm{NO}_{3}\right)\) ?
