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If the pressure increases to 800. torr, how many moles of gas were added to the container? Assume a constant-volume container.
Calculate the amount of heat must be added to accomplish this change, the final temperature of steam, the work does against its surroundings, and the internal energy and enthalpy changes of the stea
Consider the reaction CaCO3(s) = CaO(s) + CO2(g) , at equilibrium at a certain temperature. What species will be present after equilibrium is re-established?
If the methane contained in 2.00 L of a saturated solution at 25 C was extracted and placed under STP conditions, what volume would methane occupy?
The half-life of tritium (31H) is 12.3 years. what mass of the nuclide will remain after 24.6 years? What mass of the nuclide will remain after 98.4 years?
how many grams of aluminum hydroxide are obtained from 18.2g of aluminum sulfide?Aluminum sulfide reacts with water to form aluminum hydroxide and hydrogen sulfide.
Calculate the minimum quantity of 20°C water needed to dissolve all the KCl from the sample. How much KClO3 will be left after this treatment?
Although newly minted pennies look as though they are composed of copper, they actually contain 2.7% copper with zinc being the rest of the metal. If the densities of copper and zinc are respectivel
Calculate the freezing point of a solution that contains 68.4 g of sucrose (table sugar) in 300. g of water. One mole of sucrose is 342 g. Kf for H2O = 1.86 oC/m.
A 65 gram sample of copper was heated to 128.5 degrees Celsius then placed into 150 gram of water at 19.8 degrees Celsius. Calculate the final temperature of the mixture and the heat transferred fr
An iron nail with a mass of 12g absorbs 15J of heat. If the nail was initially at 28oC, what is its final temperature?
If a 1.00 kg sample of sand containing some gold has a density of 3.10 g/mL (without air spaces), what is the percentage of gold in the sample?
Assuming your trunk of your car were filled with four gas cylinders that are four feet long and have a diameter of 10 inches, what are the total moles of CNG you could hold in your trunk in these ta
Write down the dissolution equation for nickel(II) perchlorate dissolving in water. (Perchlorate is a polyatomic ion with the formula ClO41-.) If four moles of the ionic compound are dissolved, then
Determine how much heat is evolved or absorbed when 30.0g of lithium iodide completely dissolves in water.
How many grams of pure, solid NaOH are required to make 500 mL of 0.15M NaOH solution? Express your answer to 2 significant figures, e.g. 3.3 g.
The analysis of a compound showed that it contained 0.903 mol of C, 0.0430 mol of H, 0.602 mol of O, and 0.301 mol of N. How many Nitrogen atoms are there in the empirical formula for this compound?
Consider a homogeneous gallium arsenide semiconductor at T = 300 K with Nd = 1016 cm-3 and Na = 0. Calculate the thermal-equilibrium values of electron and hole concentrations.
One student dilutes 10 mL stock solution to a final volume of 20 mL. S/he dilutes 10 mL stock solution to a final volume of 40 mL. S/he dilutes 10 mL stock solution to a final volume of 60 mL. Does
Naturally occurring element X exists in three isotopic forms: X-28 (27.977 amu, 92.23% abundance), X-29 (28.976 amu, 4.67% abundance), and X-30 (29.974 amu, 3.10% abundance). Calculate the atomic we
When the tablet dissolves in water, it "fizzes" as the bicarbonate reacts with the citric acid and the vitamin C. What mass of the NaHCO3 reacts with the vitamin C?
You find a compound composed only of element "X" and hydrogen, and know that it is 79.89% element X by mass. Each molecule has 3.00 times as many H atoms as X atoms. What is element X?
how many liters of air containing 21% (v/v) O2 are required at STP to completely react (combust) 1.00 L of liquid MTBE?
The specific gravity of mercury is 13.63. What would be the mass of a sample of mercury that occupies a volume of 4.75mL?
The activation energy for the isomerization ol cyclopropane to propene is 274 kJ/mol. By what factor does the rate of this reaction increase as the temperature rises from 256 to 297 oC? (The factor