Chemistry, 30.11.2019 05:31 sindy35111
The 1995 nobel prize in chemistry was shared by paul crutzen, f. sherwood rowland, and mario molina for their work concerning the formation and decomposition of ozone in the stratosphere. rowland and molina hypothesized that chlorofluorocarbons (cfcs) in the stratosphere break down upon exposure to uv radiation, producing chlorine atoms. chlorine was previously identified as a catalyst in the breakdown of ozone into oxygen gas. using the enthalpy of reaction for two reactions with ozone, determine the enthalpy of reaction for the reaction of chlorine with ozone. (1) clo ( g ) + o 3 ( g ) ⟶ cl ( g ) + 2 o 2 ( g ) δ h ∘ rxn = − 122.8 kj mol (2) 2 o 3 ( g ) ⟶ 3 o 2 ( g ) δ h ∘ rxn = − 285.3 kj mol (3) o 3 ( g ) + cl ( g ) ⟶ clo ( g ) + o 2 ( g ) δ h ∘ rxn = ?
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Chemistry, 22.06.2019 12:00
Ican determine the molar mass of an element by looking on the under the atomic mass for the element. for example the molar mass of phosphorus is 30.974 grams/mole. avogadro’s number tells me the amount of representative particles in 1 mole of any substance. this means 12.011 gram sample of carbon and a 32.0 gram sample of sulfur have the same number of atoms.
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Chemistry, 22.06.2019 13:30
Table sugar completely dissolved in water is an example of a?
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Chemistry, 22.06.2019 14:30
Aroom with dimensions 7.00m×8.00m×2.50m is to be filled with pure oxygen at 22.0∘c and 1.00 atm. the molar mass of oxygen is 32.0 g/mol. how many moles noxygen of oxygen are required to fill the room? what is the mass moxygen of this oxygen?
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Chemistry, 22.06.2019 18:30
Which of the following nuclei would be the least stable a 2 protons, 2 neutrons b 1 proton 1 neutron c 1 proton 3 neutrons d 1 proton 2 neutrons
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The 1995 nobel prize in chemistry was shared by paul crutzen, f. sherwood rowland, and mario molina...
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