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Percentage of calcium carbonate in the sample
Dissolving 3.00 g of an impure sample of calcium carbonate in hydrochloric acid produced 0.656 L of carbon dioxide (measured at 20.0 degrees C and 792mm/Hg). Calculate the percent by mass of calcium carbonate in the sample. State any assumptions
Calculate the amount of heat liberated (in kJ) from 383 g of mercury when it cools from 61.0°C to 11.0°C.
36.8mL of hydrogren gas, from the reaction of a piece of magnesium ribbon with hydrochloric acid, are collected over water in a eudiometer. The temp of the hydrogen gas at 21C, and the atmospheric pressire is 768mmHg.
Calculate the molar solubility of calcium hydroxide in a solution buffered at each of the following pH's.
Calculate the amount of heat required to heat a 3.5 kg gold bar from 21 degrees celsius to 67 degrees celcius.
What is the atomic mass of Tc as it would appear in the periodic table. Do not enter units with your answer and use the correct number of significant figures.
Present a reaction mechanism for the sodium iodide in acetone test which explains the relative rate of reactivity of 1°, 2°, and 3° halides.
A mixture of CO2 and Kr weighs 35.0g and exerts a pressure of 0.708 atm in its container. Since Kr is expensive, you wish to recover it from the mixture. After the CO2 is completely removed by absorption with NaOH(s), the pressure in the container..
A sample of helium gas has a volume of 900. milliliters and a pressure of 2.50 atm at 298 K. What is the new pressure when the temperature is changed to 336 K and the volume is decreased to 450. milliliters?
When a mixture of 12.5g of acetylene (C2H2) and 12.5g of oxygen (O2) is ignited, the resultant combustion reaction produces CO2 and H2O
what is the equilibrium pressures for each of the gases if the initial partial pressures are PHF = .500 atm, PH2=1.00x10^-3 atm, and PF2=4.00x10^-3 atm
A pH of 3.74 is reached when 18.50 mL of sodium hydroxide has been added to the acid solution. What is the molar mass of formic acid given this data?
Empirical formula and molecular formula, 2) Two substances Q and R each have the elemental composition C = 60% h=13.3% 0=26.7% by mass 0.60 grams of each substance occupied a volume of 0.336 liters at 137 Celcius and standard pressure
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