Chemistry, 06.09.2019 20:30, minosmora01
Carbon, hydrogen and ethane each burn exothermically in an excess of air. 1. c(s)+o2(b) co2(g) ah-393.7 kl mol h2(g) +o2(g) h20(i) ah-285.9 kj mol chalg)+302(b)2co2(g) + 2h 20 ( ) ah-1411.0 kj mol use the data to calculate the standard enthalpy change of formation, ah, in kj mol, of ethene at 298 k. 2c(s)+2h2(b) cahalb) 2. manganese metal can be obtained by the reaction of manganese dioxide with aluminium. 4al(s)+3mno2(s)2 al, os(s)+3 mn(s) calculate the enthalpy change of reaction. given: 2al(s)+3/2 02(g) al2os(s) ah-1680 kj mol. mn(s)+o2(g) mno2 (s) ah -520 kj mol1
Answers: 3
Chemistry, 23.06.2019 02:00, raulflores01
Which best describes the present-day universe? opaque, expanding very slowly, stars produce heavy elements transparent, expanding at an accelerated rate, stars produce heavy elements opaque, expanding at an accelerated rate, stars produce only hydrogen and helium transparent, expanding very slowly, stars produce only hydrogen and helium
Answers: 1
Carbon, hydrogen and ethane each burn exothermically in an excess of air. 1. c(s)+o2(b) co2(g) ah-39...
Arts, 04.11.2020 18:00