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What is the actual amount of magnesium oxide produced when excess carbon dioxide reacts with 42.8grams of magnesium metal?
What concentration of aqueous NH3 is necessary to just start precipitation of Mn(OH)2 from a 0.020 M solution of MnSO4? Kb for ammonia is 1.8 x 10-5, Ksp for Mn(OH)2 is 4.6 x 10-14
The carbon dioxide that is exhaled by astronauts who are on a space shuttle is scrubbed by pumping the air through canisters of lithium hydroxide, LiOH.
A toothpaste contains 0.24 % by mass sodium fluoride, NaF and 0.30 % by mass of triclosan, C12H7Cl3O2. The mass of one tube of toothpaste is 119 g. a) How many moles of C atoms are in the toothpaste
Calculate the molar mass of a vapor that has a density of 7.535 g/L at 14°C and 743 torr.
The Hope diamond weighs 44.0 carats. Determine the volume occupied by the diamond, given that its density is 3.5 g/cm3 at 20°C, and that 1 carat = 0.200 g.
The canister is placed in an oven until all the has boiled off and the canister is empty. How much energy in calories was absorbed?
A gas sample containing 1.55 mol at 25°C exerts a pressure of 387 torr. Some gas is added to the same container, and the temperature is increased to 50.°C. If the pressure increases to 800.
Compare the properties of elements and compounds. Give two examples of each, including one example that exists in the human body. Explain the atomic nature of one element and one compound found in hum
When X rays of wavelength 0.084 nm are diffracted by a metallic crystal, the angle of first-order diffraction (n = 1) is measured to be 15.2 degrees;. What is the distance between the layers of ato
A sample of chloroform is found to contain 10.5 g of carbon, 93.1 g of chlorine, and 0.88 g of hydrogen. If a second sample of chloroform is found to contain 20.8 g of carbon, what is the total mass
An aqueous solution of CaCl2 has a vapor pressure of 84.0mmHg at 50 C . The vapor pressure of pure water at this temperature is 92.6mmHg . What is the concentration of CaCl2 in mass percent?
How does a large electronegativity difference affect molecular properties?
How much energy (in kilojoules) is required to convert 245 mL of diethyl ether at its boiling point from liquid to vapor if its density is 0.7138 g/mL ?
Calculate the wavelength of light emitted when each of the following transitions occur in the hydrogen atom. What type of electromagnetic radiation is emitted in each transition?
You have a 1.0cm3 sampleof lead and a 1.0cm3 sample of glass. You drop each in a separate beaker of water. How do the volumes of water that are displaced by the samples compare? Explain.
The distance between layers in a crystal is 393 pm. X rays are diffracted from these layers at an angle of 39.4° What is the difference between the layers?
A sealed balloon is filled with 1.30 L of helium at 23°C and 1.00 atm. The balloon rises to a point in the atmosphere where the pressure is 180. torr and the temperature is -32°C. What is th
How much heat (in BTU) would be required to heat and vaporize 100 lb of water from 25°C to saturated steam at 1 atm? A
Write the full electronic configuration for Sr, He, Zn, Br
If a compound has a molar mass of 156 g/mol, what is its molecular formula? If a compound has a molar mass of 88 g/mol, what is its molecular formula?
In the reaction PCl3 + Cl2 ---> PCl5, what will happen to the rate (increase, decrease, no effect) when a) the concentration of PCl3 was increased, b) if the concentration of Cl2 were decreased,
Compound when dissolved in 100. g of water produces a solution with a freezing point of -0.325°C. What is the molecular formula of the compound?
If a sample containing 1.00 mL of nitroglycerine (density = 1.592 g/mL) is detonated, how many total moles of gas are produced?
To what volume will the gases expand against a constant pressure of 650 torr if all the energy of combustion is converted into work to push the piston?