Problem 41
Given 0.150 L of nitrous oxide at \(25^{\circ} \mathrm{C}\) and \(749 \mathrm{~mm} \mathrm{Hg}\) pressure, calculate the number of \(\mathrm{N}_{2} \mathrm{O}\) molecules. What is the mass of the gas?
Problem 42
Given \(6.55 \mathrm{~g}\) of carbon dioxide gas, calculate the volume of gas at \(75^{\circ} \mathrm{C}\) and 0.750 atm pressure. What is the number of gas molecules?
Problem 43
Mannitol is an artificial sweetener found in sugarless gum. The percentage composition is \(39.6 \%\) carbon, \(7.77 \%\) hydrogen, and \(52.8 \%\) oxygen and the density is \(1.47 \mathrm{~g} / \mathrm{mL}\) If mannitol contains \(4.93 \times 10^{21}\) molecules per milliliter, what is the molecular formula of mannitol?
Problem 45
Heating solid sodium chlorate with manganese dioxide catalyst produces solid sodium chloride and oxygen gas. If \(245 \mathrm{~mL}\) of wet oxygen are collected over water at \(25^{\circ} \mathrm{C}\) and \(754 \mathrm{~mm} \mathrm{Hg}\), what mass of sodium chlorate was decomposed? The vapor pressure of water at \(25^{\circ} \mathrm{C}\) is \(24 \mathrm{~mm} \mathrm{Hg}\).
Problem 46
Heating solid potassium chlorate with manganese dioxide catalyst produces solid potassium chloride and oxygen gas If \(455 \mathrm{~mL}\) of wet oxygen are collected over water at \(23{ }^{\circ} \mathrm{C}\) and \(766 \mathrm{~mm} \mathrm{Hg}\), what mass of potassium chlorate was decomposed? The vapor pressure of water at \(23^{\circ} \mathrm{C}\) is \(21 \mathrm{~mm} \mathrm{Hg}\)
Problem 47
If a paper manufacturer produces 4,125,365 sheets of paper, how many reams of paper can be sold? (A ream is 500 sheets.)
Problem 48
If a pencil manufacturer produces 288,125 pencils, how many gross of pencils can be sold? (A gross is 144 pencils.)
Problem 49
Given that 25.0 L of sulfur dioxide reacts with 25.0 L of oxygen gas according to the unbalanced equation $$\mathrm{SO}_{2}(g)+\mathrm{O}_{2}(g) \stackrel{\mathrm{V}_{2} \mathrm{O}_{3} / 650^{\circ} \mathrm{C}}{\longrightarrow} \mathrm{SO}_{3}(g)$$ (a) What is the limiting reactant? (b) Assuming constant conditions, what is the volume of \(\mathrm{SO}_{3} ?\)
Problem 55
What is the molar sodium ion concentration resulting from mixing of \(50.0 \mathrm{~mL}\) of \(0.100 \mathrm{M}\) sodium chloride and \(50.0 \mathrm{~mL}\) of \(0.200 \mathrm{M}\) sodium sulfate?
Problem 56
What is the molar sodium ion concentration resulting from mixing of \(50.0 \mathrm{~mL}\) of \(0.100 \mathrm{M}\) sodium chloride and \(50.0 \mathrm{~mL}\) of \(0.200 M\) sodium sulfate?
