Matter is neither created nor destroyed in a chemical reaction. Thus, the mass of the products of a chemical reaction must be equal to the mass of the starting materials. Formally, this concept is called the law of conservation of mass.

A sample of sodium reacts completely with 0.568 kg of chlorine, forming 936 g of sodium chloride. What mass of sodium reacted?

When carbon is burned in air, it reacts with oxygen to form carbon dioxide. When 26.4 g of carbon were burned in the presence of 83.6 g of oxygen, 13.2 g of oxygen remained unreacted. What mass of carbon dioxide was produced?

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13 Dec 2019

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Part A) Calculate the mass of water produced when 6.23 g of butane reacts with excess oxygen.

Part B) Calculate the mass of butane needed to produce 78.5 g of carbon dioxide.

Part C) A sample of sodium reacts completely with 0.355 kg of chlorine, forming 585 g of sodium chloride. What mass of sodium reacted?

Part D) When carbon is burned in air, it reacts with oxygen to form carbon dioxide. When 27.6 g of carbon were burned in the presence of 92.2 g of oxygen, 18.6 g of oxygen remained unreacted. What mass of carbon dioxide was produced?

Use the following information to identify element A and com- pound 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 con- tainer is evacuated and refilled with a certain element (A) at a 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 stain- less steel vessel (10.68 L) 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 Ascarite and a desiccant. Ascarite is asbestos impregnated with sodium hydroxide; it quantitatively absorbs carbon dioxide:

2NaOH1s2 CO1g2 Â¡ NaCO1s2 HO1l2 2232

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 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 10.0 L A and 8.60 L

B (each at STP) are reacted by opening a stopcock connect-

ing the two samples?
b. What will be the total pressure in the system?