Veja a entalpia-padrão de formação, em KJ. mol-1 e a 25°C, de algumas substâncias: CH4(g) -74,8; CHCl3(l) - 134,5; HCl(g) - 92,3 Se realizarmos a reação de cloração do metano, qual será o valor da variação da entalpia do processo? CH4(g) + 3Cl2(g) → CHCl3(l) + 3HCl(g)

Select the correct answer how does the heat content of the reaction change in the process of photosynthesis when a glucose molecule is formed? ca the value of is negative the value of qis positive the value of a remains constant the value of a decreases the value of equals zero e

The human eye contains a molecule called 11-cis-retinal that changes shape when struck with light of sufficient energy. the change in shape triggers a series of events that results in an electrical signal being sent to the brain that results in vision. the minimum energy required to change the conformation of 11-cis-retinal within the eye is about 164 kj/mol.

Isopropyl alcohol, (ch3)2choh, is a common solvent. determine the percent by mass of hydrogen in isopropyl alcohol. a) 6.71% h b) 13.4% h c) 25.0% h d) 53.3% h