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1 - Compute the internal energy change if an ideal gas expands from a volume of 2.3 L to 6.4 L against a pressure of 1.8 atm and 330 J of heat are transferred from the surroundings to the system.
2 - A sample of metal weighing 33.6 g is heated to 99.4 oC and transferred to a calorimeter containing 51.2 g of water at an initial temperature of 19.8 oC. The final temperature in the calorimeter is 25.0oC. What is the specific heat of the metal?
3 - Given the following equation for the combustion of ammonia, compute the enthalpy change if 2.2 moles of ammonia are burned in excess oxygen 4NH3(g) + 5O2(g) ? 4NO(g) + 6H2O(g) ?H = ?904 kJ/mol
4 - 0.06 moles each of Ag+(aq) and Cl?(aq) react to form AgCl(s) precipitate in a calorimeter containing 48.8 g of water and the temperature increases from 20.1 oC to 39.4 oC. Compute the enthalpy of reaction per mole of Ag+.
The wastewater solution from a factory containing high levels of salts needs to be diluted before it can be released into the environment. Therefore, two containers of waste solution are separated by a semipermeable membrane
When 50.0 grams of metal at 75.0 °C is added to 100. grams of water at 15.0 °C, the temperature of the water rises to 18.3 °C. Assume that no heat is lost to the surroundings.
What is the pH of a buffer that results when 0.50 mole of Na3PO4 is mixed with 0.75 mole of HCl and diluted with water to 1.00 L? The acid dissociation constants for phosphoric acid
the gas sample weighs 2.62grams then computes the molecular weight and determines the identity of the gas.
Determine what is the observed rate for the given reaction - empirically determined rate
How many moles of hydrogen gas are produced when 0.066 mole of sodium is completely reacted?
calculate number of moles of anhydrous compound recovered. c- calculate number of moles of water lost from the hydrated compound.d- what is the formula of the hydrate?
When 4-hydroxybutanal is treated with methanol in the presence of an acid catalyst, 2-methoxytetrahyrofuran is formed. Show the mechanism for this reaction.
A steel cylinder with nitrogen, hydrogen, and ammonia gases is at 500°C and 4.91 atm. If the partial pressure of nitrogen is 1850 mmHg and hydrogen is 1150 mmHg
What is the percent purity of the calcium hydroxide if the titration requires 7.81 mL of the acid to reach the endpoint?
What molarity of aqueous magnesium chloride solution can be expected to show the same conductivity
A gas is collected over water at a certain temperature. The total pressure is 762 torr. The vapor pressure of water at this temperature is 17 torr.
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