Tema
Q:
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?
Q:
5. At what pressure will 7.89 g of ammonia gas, \( \mathrm{NH}_{3} \), occupy 7.46 L at \( 20.0^{\circ} \mathrm{C} \) ?
Q:
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.
Q:
How many mg in each ml of a \( 10 \% \) solution of NaCl ?
Q:
How many \( \mathrm{mg} / \mathrm{ml} \) does a \( 2.5 \% \) solution contain?
Q:
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 \( 23.0^{\circ} \mathrm{C}=21.1 \mathrm{mmHg} \) )
\( (0.00481 \mathrm{~mol}) \)
Q:
3. What is the volume of 23.6 g of oxygen gas at STP?
Q:
Calculate the density, in grams per liter, of a gas at STP if 3.04 L of the gas at \( 11.2^{\circ} \mathrm{C} \) and 715.5 mmHg weighs 0.400 g .
Q:
Equilibrio ácido-base
1. Aplicando la teoria de Brŏnsted-Lowry sobre ácidos y bases, completa y explica el comportamiento de
cada ión o molécula y las parejas ácido-base conjugado:
a) \( \mathrm{HCl}+\mathrm{H}_{2} \mathrm{O} \)
b) \( \mathrm{H}_{2} \mathrm{CO}_{3}+\mathrm{H}_{2} \mathrm{O} \)
c) \( \mathrm{NH}_{3}+\mathrm{H}_{2} \mathrm{O} \)
d) \( \mathrm{HF}+\mathrm{H}_{2} \mathrm{O} \)
e) \( \mathrm{KOH}+\mathrm{H}_{2} \mathrm{O} \)
Q:
Exercice 6
La combustion dans du dioxygène de \( 0,295 \mathrm{~g} \) d'une substance donne
\( -0,440 \mathrm{~g} \) de dioxyde de carbone
-0,210g d'eau
L'analyse effectuée sur la même másse fournit \( 37,00 \mathrm{~mL} \) de diazote, volume mesuré dans les CNTP
\( 1^{\circ} \) ) Sachant que le composé renferme essentiellement du carbone, de l'hydrogène, de l'oxygène et de
l'azote, déterminer sa composition centésimale massique
\( 2^{\circ} \) ) Trouver sa formule brute sachant que la molécule ne renferme qu'un atome d'azote
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