Chemistry, 18.09.2019 02:00 esdoles3865
We use hess's law to calculate enthalpy changes that cannot be measured. one such reaction is the conversion of methane to ethylene: 2 ch4(g) → c2h4(g) + 2 h2(g) calculate δhrxn for this reaction using the thermochemical data: ch4(g) + 2 o2(g) → co2(g) + 2 h2o(g) δh = -802.5 kj c2h4(g) + h2(g) → c2h6(g) δh = -136.4 kj 2 h2(g) + o2(g) → 2 h2o(g) δh = -483.6 kj 2 c2h6(g) + 7 o2(g) → 4 co2(g) + 6 h2o(g) δh = -2856.8 kj
Answers: 3
Chemistry, 22.06.2019 21:00
As we move from left to right across the periodic table, what is the general trend? a) atomic radii increase. b) electronegavitiy decreases. c) nuclear shielding increases. d) metallic character decreases.
Answers: 1
Chemistry, 23.06.2019 00:00
How is the way a mixture is combined different from how a compound is combined?
Answers: 3
Chemistry, 23.06.2019 03:30
If you need to add 27.50ml of a solution, which piece of glassware would you use to deliver this volume and explain how you would determine if the 27.50 ml was measured?
Answers: 2
Chemistry, 23.06.2019 13:30
The zinc within a copper-plated penny dissolves in hydrochloric acid if the copper coating is filed down in several spots (so that the hydrochloric acid can reach the zinc). the reaction between the acid and the zinc 2h+(aq)+zn(s)→h2(g)+zn2+(aq) . when the zinc in a certain penny dissolves, the total volume of gas collected over water at 25 °c is 0.947 l at a total pressure of 743 mmhg . (vapor pressure of water is 23.78 mmhg at 25 °c .) what mass of hydrogen gas is collected? answer in appropriate significant figures
Answers: 3
We use hess's law to calculate enthalpy changes that cannot be measured. one such reaction is the co...
Biology, 07.12.2021 03:50
Mathematics, 07.12.2021 03:50
SAT, 07.12.2021 03:50
Mathematics, 07.12.2021 03:50