Données: \( \mathrm{C}=12 \mathrm{~g} / \mathrm{mol} ; \mathrm{H}=1 \mathrm{~g} / \mathrm{mol} ; \mathrm{V}_{\mathrm{m}}=22,4 \mathrm{~L}_{\mathrm{mol}} \mathrm{mol}^{-1} \) Tu es le rapporteur du groupe. 1-Donne la formule brute générale des alcynes. 2-Ecris l'équation bilan de la réaction d'hydrogénation d'un alcyne 3- Détermine: 3-1. La formule brute de l'alcyne A . 3-2.la masse \( \mathrm{m}_{\mathrm{B}} \) de l'alcane formé.

How many \( \mathrm{mg} / \mathrm{ml} \) does a \( 2.5 \% \) solution contain?

3. What is the volume of 23.6 g of oxygen gas at STP?

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 \( 23.0^{\circ} \mathrm{C}=21.1 \mathrm{mmHg} \) ) \( (0.00481 \mathrm{~mol}) \)

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) \( \mathrm{KOH}+\mathrm{H}_{2} \mathrm{O} \)