1. Lithium reacts with oxygen to form lithium oxide according to the equation: 4Li + O2 = 2Li2O. If 27.8 g of Li react completely with 32.0 g of O2, how many grams of Li2O are formed?
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1. Lithium reacts with oxygen to form lithium oxide according to the equation: 4Li + O2 = 2Li2O. If 27.8 g of Li react completely with 32.0 g of O2, how many grams of Li2O are formed?
2. Aluminum hydroxide, Al(OH)3, decomposes to form aluminum oxide, Al2O3, and water according to the reaction: 2Al(OH)3 = Al2O3 + 3H2O. If 156.0 g of Al(OH)3 decompose to from 102.0 g of Al2O3, how many grams of H2O are formed?
3. In the following balanced
4. When propane, C3H8, is burned, carbon dioxide and water vapor are produced according to the following reaction: C3H8 + 5O2 = 3CO2 + 4H2O. How much propane is burned if 160.0 g of O2 are used and 132.0 g of CO2 and 72.0 g of H2O are produced?
5. Increasing the temperature usually causes the rate of a chemical reaction to increase. If the rate of a chemical reaction doubles when the temperature increases by 10 C, by what factor does the
6. When methane, CH4, is burned, 50.1 kJ of energy per gram are released. When propane, C3H8, is burned, 45.8 kJ of energy are released. If a mixture of 1 g of methane and 1 g of propane is burned, how much energy is released per gram of mixture?
7. A chemical reaction produces 0.050 g of a product in 0.18 s. In the presence of a catalyst, the reaction produces 0.050 g of the same product in 0.007 s. How much faster is the rate of reaction in the presence of the enzyme?
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