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What is the equilibrium partial pressure (in atm) of H2S if a solid sample of NH4HS is placed in a closed container and allowed to reach equilibrium at 295 K?
A substance has a specific heat capactiy of 2 J/g C. How many joules are needed to raise the temperature of 30 g of this substance by 15 C.
How many grams of water will you require? (B) If you produce 1.00 L of a .554 M solution of calcium hydroxide, how many grams of calcium phosphide did you start with?
A mixture of 1.374 g of H2 and 70.31 g of Br2 is heated in a 2.00-L flask at 700 K. The following equilibrium is established:
Which of the following obey the octet rule BeH2, CCl3, SeO2 (2-), PCl3, KrCl2, NO2? and if they do not obey the octet rule, what is the problem? are there too many valence electrons, or too few?
If 4.00 grams of water at an initial temperature of 1.00 degrees C absorbs 33.00 joules of heat, by how many degrees C does the water temperature change?
How many grams of Na3PO4 will be needed to produce 400 mL of a solution that has a concentration of Na+ ions of 0.800 M.
117 gram sample of a metal reacts with hyrdochloric acid to produce 36.3 ml of dry hydrogen gas, measured at stp. what is the equivalent weight of this metal?
Starting with only the solid, it is found that 40 degrees Celsius the total gas pressure (NH3 and CO2) is 0.363 atm. Calculate the partial pressure of NH3 and CO2.
A solution is prepared by dissolving 246 g of sucrose (C12H22O11) in 624 g of water. What is the vapor pressure of this solution at 30°C? (The vapor pressure of water is 31.8 mmHg at 30°C.)
Consider 54.5 mL of a solution of weak acid HA (Ka = 1.00 10-6), which has a pH of 3.700. What volume of water must be added to make the pH = 6.000?
Calculate the number of water molecules that can be prepared from 664 H2 molecules and 664 O2 molecules.
The solution has a vapor pressure of 262 . Pure pentane and hexane have vapor pressures of 425 and 151 , respectively, at room temperature. What is the mole fraction of hexane? (Assume ideal behavi
What mass of magnesium, in reaction with an excess of hydrochloric acid, is needed to produce 128 mL of hydrogen (H2) gas?
Calculate the amount of heat required to completely sublime 99.0 g of solid dry ice CO2 at its sublimation temperature. The heat of sublimation for carbon dioxide is 32.3 KJ/Mol
How many molecules of would be formed from the reaction mixture that produces the greatest amount of products?
A piece of a newly synthesized material of mass 25.0g at 80 degrees C is placed in a calorimeter containing 100g of water at 20 degrees C. If the final temp of the system is 24 degrees C, what is t
The sum exerts a gravitational force of 4.0 * 10^28 N on the earth, and the earth travels 9.4 * 10^11 m in its yearly orbit around the sun. How much work is done by the sun on the earth each year?
How many liters of oxygen gas can be produced at STP from the decomposition of 0.125 L of 3.00 M H2O2 in the reaction according to the chemical equation shown below?
An aqueous CaCl2 solution has a vapor pressure of 82 mm Hg at 50C. The vapor pressure of pure water at this temperature is 92.6 mmHg. What is the concentration of CaCl2 in mass percent?
Assuming H and S do not vary with temperature, at what temperature will the reaction shown above become spontaneous?
Give an explanation for how calmagite works as an indicator for the titration of magnesium ion with EDTA. Explain why the water sample was buffered before it was titrated with EDTA.
A scuba diver with a lung capacity of 5.1 L inhales a lungful of air at a depth of 44 m and a pressure of 5.4 atm.If the diver were to ascend to the surface (where the pressure is 1.0 rm atm) while
35.5 grams of an unknown substance is heated to 103.0 degrees Celsius and then placed into a calorimeter containing 100.0 grams of water at 24.0 degrees Celsius. If the final temperature reached in
Assuming the solution has a heat capacity of 4.18 J/°C·g and assuming no heat loss to the calorimeter, calculate the enthalpy change for the dissolution of NH4NO3 in units of kJ/mol.