1. Una muestra de 1.227 g de alumbre, K 2 SO 4 - \( \mathrm{Al}(\mathrm{SO} 4) 3 \) - 24 H 2 O , que contiene sólo impurezas inertes, se disuelve y el aluminio se precipita con 8 - hidroxiquinoleína. Una vez filtrado, el precipitado se calcina a Al2O3, obteniéndose una masa de 0.1098 g . Calcular los porcentajes de aluminio y azufre en la muestra.

5) \( \mathrm{Ag}_{2} \mathrm{O} \rightarrow \)

5. At what pressure will 7.89 g of ammonia gas, \( \mathrm{NH}_{3} \), occupy 7.46 L at \( 20.0^{\circ} \mathrm{C} \) ?

6. Aluminum reacts with oxygen according to the following reaction: \[ 4 \mathrm{Al}(s)+3 \mathrm{O}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{Al}_{2} \mathrm{O}_{3}(s) \] How many liters of oxygen gas at STP are required to completely react with 55.0 g of aluminum?

6. If 380 g of cottonseed oil measures 415 mL , what is its specific gravity? 7. If \( 2 \mathrm{fl} \). oz. of glycerol weighs 74.1 g , what is its specific gravity? 8. Five pints of diluted hydrochloric acid weights 2.79 kg . Calculate its specific gravity.

How many moles of carbon dioxide, collected over water, occupy 125 mL at 732.0 mmHg and \( 23.0^{\circ} \mathrm{C} \) ? (water vapor pressure at \( 23.0^{\circ} \mathrm{C}=21.1 \mathrm{mmHg} \) ) \( (0.00481 \mathrm{~mol}) \)