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Trimix gas is used for very deep diving. It is composed of three gases, usually helium, nitrogen and oxygen. The composition is denoted as percentage of oxygen / percentage of helium, e.g. 17/50 is Trimix with 17% oxygen, 50% helium and the balance is nitrogen. Assume these as mass percents. Calculate: a. the mass percentage of nitrogen in the mixture b. the mole fraction of each gas in the mixture.
Photoheterotrophic microorganisms that use photoenergy, but depend on organic matter as a carbon source, are abundant and widespread
A solution of a weak acid, HA, is prepared by dissolving 4.8 mmol of HA in 10.0 liters of a solution.The following values of absorbances were measured in a 1.0 cm cell in various buffers.
Dimethyl ether, used as a solvent for extraction of organic compounds from aqueous solutions, has a high vapor pressure which makes it a potential fire hazard in labratories in which it is used
The nitrogen-nitrogen bond lengths in N2H4, N2F2, and N2 are 1.45, 1.25, and 1.10 A, respectively. Using the Lewis Structures, how can this trend be explained? No formal charges needed?
what change in the number of moles of Ag occurs in the system? (2)what change in the concentration of Ag occurs in the system?
The mass of a cube of iron is 379 g. Iron has a density of 7.87 g/cm3. What is the mass of a cube of lead that has the same dimensions?
An aerosol spray can of deodorant with a volume of 350 mL contains 3.0 g of propane gas C3H8 as propellant.
Nitrogen monoxide gas reacts with oxygen gas to produce nitrogen dioxide gas. what volume of nitrogen dioxide is produced from the reaction of 2 L nitrogen monoxide gas with 3 L oxygen gas?
Calculate the mass of pure silver that when heated from 12.0 degrees celcius to 15.2 degrees celcius it required 1.25 kj of energy
Using the reaction 2C6H6+15O2--->12CO2+6H2O, what volume of carbon dioxide will be produced when 128.0 grams of benzene react.
If a solution is made of naphthalene in heptane and has a vapor pressure of 82 torr, what is the mole fraction of naphthalene? Assume ideal solution behavior.
one type of electromagnetic radiation has a frequency of 107.1 MHz another type has a wavelength of 2.12*10^-10m,and another type ofelectromagnetic radiation has photons with energy equal to 3.97*10^-19J/photon. identify each type of electromagnet..
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