Chemistry, 31.08.2020 07:01 mccdav5100
11. A certain gas takes three times as long to effuse out
as helium. Its molecular mass will be
(2) 36 u
(1) 27 u
(3) 64 u
(4) 9u
Answers: 2
Chemistry, 22.06.2019 09:20
Explain that newton first law,second law and third law of motion?
Answers: 2
Chemistry, 22.06.2019 19:20
15. which of the following is not human-caused groundwater pollution? a. water in an aquifer dissolves elements such as arsenic and mercury from surrounding rock. b. water in an aquifer is contaminated by leachate that seeps into the ground from a landfill. c. water in an aquifer becomes polluted with chemicals used in hydraulic fracturing, or fracking. d. water in an aquifer absorbs harmful bacteria from the drainage field of a septic tank.
Answers: 1
Chemistry, 22.06.2019 23:00
Consider the reaction: 2al(s) + fe2o3(s) → al2o3(s) + 2fe(s) the δhf for fe2o3(s) = -824.3 kj/mole. the δhf for al2o3(s) = -1675.7 kj/mole. finish the equation. δhrxn = [(1)( kj/mole) + (2)( kj/mole)] - [(1)( kj/mole) + (2) ( kj/mole)]
Answers: 1
11. A certain gas takes three times as long to effuse out
as helium. Its molecular mass will be
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