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Chapter 3: Problem 79
Fungal laccase, a blue protein found in wood-rotting fungi, is 0.390$\% \mathrm{Cu}$ by mass. If a fungal laccase molecule contains four copper atoms, what is the molar mass of fungal laccase?
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Elixirs such as Alka-Seltzer use the reaction of sodium bicarbonate with citric acid in aqueous solution to produce a fizz: $$ 3 \mathrm{NaHCO}_{3}(a q)+\mathrm{C}_{6} \mathrm{H}_{8} \mathrm{O}_{7}(a q) \longrightarrow $$ $$ 3 \mathrm{CO}_{2}(g)+3 \mathrm{H}_{2} \mathrm{O}(l)+\mathrm{Na}_{3} \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{O}_{7}(a q) $$ a. What mass of \(\mathrm{C}_{6} \mathrm{H}_{8} \mathrm{O}_{7}\) should be used for every \(1.0 \times 10^{2} \mathrm{mg} \mathrm{NaHCO}_{3} ?\) b. What mass of \(\mathrm{CO}_{2}(g)\) could be produced from such a mixture?
You take 1.00 g of an aspirin tablet (a compound consisting solely of carbon, hydrogen, and oxygen), burn it in air, and collect 2.20 $\mathrm{g} \mathrm{CO}_{2}\( and 0.400 \)\mathrm{g} \mathrm{H}_{2} \mathrm{O} .$ You know that the molar mass of aspirin is between 170 and 190 $\mathrm{g} / \mathrm{mol}\( . Reacting 1 \)\mathrm{mole}$ of salicylic acid with 1 mole of acetic anhydride \(\left(\mathrm{C}_{4} \mathrm{H}_{6} \mathrm{O}_{3}\right)\) gives you 1 mole of aspirin and 1 mole of acetic acid $\left(\mathrm{C}_{2} \mathrm{H}_{4} \mathrm{O}_{2}\right)$ Use this information to determine the molecular formula of salicylic acid.
The compound adrenaline contains \(56.79 \% \mathrm{C}, 6.56 \% \mathrm{H}\) , \(28.37 \% \mathrm{O},\) and 8.28\(\% \mathrm{N}\) by mass. What is the empirical formula for adrenaline?
What mass of sodium hydroxide has the same number of oxygen atoms as 100.0 \(\mathrm{g}\) of ammonium carbonate?
a. Write the balanced equation for the combustion of isooctane \(\left(\mathrm{C}_{8} \mathrm{H}_{18}\right)\) to produce water vapor and carbon dioxide gas. b. Assuming gasoline is \(100 . \%\) isooctane, with a density of 0.692 \(\mathrm{g} / \mathrm{mL}\) , what is the theoretical yield of carbon dioxide produced by the combustion of \(1.2 \times 10^{10}\) gal of gasoline (the approximate annual consumption of gasoline in the United States)?
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