Homework Help Forum: college

Posted by Ada on Monday, November 2, 2009 at 10:52am.

Use the following information to identify element A and compound B, then answer questions a and b. An empty glass container has a mass of 658.572 g. It has a mass of 659.452 g after it has been filled with nitrogen gas at a pressure of 790 torr and a temperature of 15 C. When the container is evacuated and refilled with a certain element (A) ata pressure of 745 torr and a temperature of 26 C, it has a mass of 660.59 g. Compound B, a gaseous organic compound that consists of 85.6% carbon and 14.4% hydrogen by mass, is placed in a stainless steel vessel (10.68L) with excess oxygen gas. The vessel is placed in a constant temperature bath at 22 C. The pressure in the vessel is 11.98 atm. In the bottom of the vessel is a container that is packed with Ascarit and a desiccant. Ascarite is abestos impregnated with sodium hydroxide; it quantitatively absorbs carbon dioxide: 2NaOH + CO2 => Na2CO2 + H2O The desiccant is anhydrous magnesium perchlorate, which quantitatively absorbs the water produced by the combustion reaction as well as the water produced by the above reaction. Neither the Ascarite nor the desiccant reacts with compound B or the oxygen. The total mass of the container with the Ascarite and desiccant is 765.3 g. The combustion reaction of compound B is initiated by a spark. The pressure immediately rises, then begins to decrease, and finally reaches a steady value of 6.02 atm. The stainless steel vessel is carefully opened, and the mass of the container inside the vessel is found to be 846.7 g. A and B react quantitatively in a 1:1 mole ratio to form one mole of the single product, gas C. a. How many grams of C will be produced if 10.0L of A and 8.60L of B (each at STP) are reacted by opening a stopcok connecting the two samples. b. What will be the total pressure in the system?

• college/science - GuruBlue, Monday, November 2, 2009 at 11:06am

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