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All chemical reactions, spontaneous and non spontaneous require an energy "push" in the form of energy of activation. why is the reaction called spontaneous if energy is required to start the reaction?
in an experiment similar to the empirical formula experiment in the lab book a student reacted beryllium and oxygen
A gasous mixture of O2 and Kr has a density of 1.104 grams per liter at 435 torr and 300 K. What's the mole percent of O2 in the mixture?
How much heat is required to warm 215 g of ice from -44.1°C to 0.0°C, melt the ice, warm the water from 0.0°C to 100.0°C, boil the water, and heat the steam to 173.0°C?
Converting liquid water to solid ice releases 1.44 kcal/mol. How many kilocalories are released by freezing 2.5 mol of H2O? How many kilocalories are released by freezing 32 g of H2O.
Determine the total number of double bonds and/or rings for a hydrocarbon
A solution is made by dissolving 0.75 g of salt in 100.00 g of water. Calculate the % m/m for the solution. *0.74% m/m *0.75% m/m *7.5% m/m *7.4% m/m
How many grams of antifreeze (C_2 H_4(OH)_2) would be required per 500 g of water to prevent the water from freezing at a temperature of -27 degrees celsius? answer in units of g.
What is the pH of a solution which results from mixing 150 mL of 0.50M acetic acid and 150 mL of 0.50M sodium hydroxide at 25oC?
A 145 g aluminum cylinder is removed from a liquid nitrogen bath, where it has been cooled to -196° C. The cylinder is immediately placed in an insulated cup containing 226 g of water at 15.0° C,
What is the internal energy change for the system if 969 joules of heat flows into the system from the surroundings and 253 joules of work is done by the system on the surroundings
A gas at 89.0°C occupies a volume of 0.67 L. At what Celsius temperature will the volume increase to 1.12 L
If 18.4 mL of 0.800 M HCl solution are needed to neutralize 5.00 mL of a household ammonia solution, what is the molar concentration of the ammonia?
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