Answer to Question #278532 in General Chemistry for Daniel

Question

1. How many moles of ethane is required to produce 44 g of CO2 (g) after combustion.

2. Calculate the number of molecules of oxygen gas that occupies a volume of 224 ml at 273 K and 3 atm pressure.

3. How much volume of chlorine is required to form 11.2 L of HCl at 273 K and 1 atm pressure?

4. Calculate the percentage composition of the elements present in magnesium carbonate. How many kilograms of CO2 can be obtained by heating 1 kg of 90 % pure magnesium carbonate?

5. What is the mass of the precipitate formed when the preparation of alkyl halides 50 ml of 16.9 % solution of AgNO3 is mixed with 50 ml of 5.8 % NaCl solution?

6. Urea is prepared by the reaction between ammonia and carbon dioxide. 2 NH3(g) + CO2(g) (NH4)2CO(aq) + H2O(l) In one process, 637.2 g of NH3 are allowed to react with 1142 g of CO2.

(a) Which of the reactants is the limiting reagent?

(b) Calculate the mass of (NH4)2CO formed.

(c) How much of the excess reagent in grams is left at the end of the reaction?

Answer 1

0.5 mole or 15 gm Ethane is required to produce 44 gm. of CO2.

Temperature of the Gas(T) = 273 K. and n = number of moles. ⇒ n = 0.02 moles. Thus, the number of the molecules of the Oxygen gas is 0.121 × 10²³ molecules.