Chapter 3: Problem 58
Write the symbols used to represent gas, liquid, solid, and the aqueous phase in chemical equations.
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Chapter 3: Problem 58
Write the symbols used to represent gas, liquid, solid, and the aqueous phase in chemical equations.
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Which of the following has a greater mass: 2 atoms of lead or \(5.1 \times 10^{-23}\) mole of helium?
Use ammonia \(\left(\mathrm{NH}_{3}\right)\) to explain what is meant by the percent composition by mass of a compound.
On what law is stoichiometry based? Why is it essential to use balanced equations in solving stoichiometric problems?
The molar mass of caffeine is \(194.19 \mathrm{~g}\). Is the molecular formula of caffeine \(\mathrm{C}_{4} \mathrm{H}_{5} \mathrm{~N}_{2} \mathrm{O}\) or \(\mathrm{C}_{8} \mathrm{H}_{10} \mathrm{~N}_{4} \mathrm{O}_{2} ?\)
A sample of iron weighing \(15.0 \mathrm{~g}\) was heated with potassium chlorate \(\left(\mathrm{K} \mathrm{ClO}_{3}\right)\) in an evacuated container. The oxygen generated from the decomposition of \(\mathrm{KClO}_{3}\) converted some of the Fe to \(\mathrm{Fe}_{2} \mathrm{O}_{3}\). If the combined mass of Fe and \(\mathrm{Fe}_{2} \mathrm{O}_{3}\) was \(17.9 \mathrm{~g},\) calculate the mass of \(\mathrm{Fe}_{2} \mathrm{O}_{3}\) formed and the mass of \(\mathrm{KClO}_{3}\) decomposed.
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