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Q: Which computer career field enables you to create and design interactive multimedia products and services? Network Systems Information Support and Services Web and Digital Communications Programming a.If you assume the helium atoms are spheres of radius 3.1×1011m3.

The cylinder holds 4.00×102mol4.00×102mol of helium under pressure at 27.0CC. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas and the first. Because the helium has a lower molar mass than the average air molecule, the helium atoms are in faster motion. Helium is a chemical element with the symbol He and atomic number 2. The mass of the balloon is thus less than the mass of the air displaced by its volume d. Answer : Number of moles Given mass / Molar mass 52/ 4 13 moles. A cylinder for storing helium (molar mass 4.00 g/molg/mol) has an interior volume of 50.0 L5.00×102m3L5.00×102m3. Because the helium atoms are of lower mass than the average air molecule, the helium gas is less dense than air.

Q: How much heat must be added to 0.45 kg of aluminum to change it from a solid at 130 8c to a liquid at 660 8c (its melting point)? the latent heat of fusion for aluminum is 4.0 3 10 5 j/kg? Calculate the number of moles is 52 g of He Helium Atomic mass: O 16 u He 4 u.

Q: Fundamentally, how are ΔHrxnand ΔHfdifferent?Which part of the experiment demonstrated the change inenthalpy per mole of a reaction? Molar Mass, Molecular Weight and Elemental Composition Calculator Enter a chemical formula to calculate its molar mass and elemental composition: Molar mass of helium is 4.0026020 0.

express all three concentrations in molarity. mean molecular weight helium gives 3/4 particle per m (a nucleus containing 2 protons and 2 neutrons 4mH and two electrons), and heavier elements give 1.

Q: Determine the concentrations of k2so4, k, and so42– in a solution prepared by dissolving 2.77 × 10–4 g k2so4 in 1.50 l of water.