Hydrogenation of double and triple bonds is an important industrial process. Calculate (in kJ) the standard enthalpy change ΔH for the hydrogenation of ethyne (acetylene) to ethane: H−C≡C−H(g)+H2→H3C−CH3(g)
Bond enthalpies (in kJ/mol):

C−C (342)

C≡C (818.4)

C−H (403.4)

H−H (433.7)

it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

→

jdjxnbfb

explanation:

jjfnc fdnxnxx

aquifers are bounded above and below by impermeable rock. the driving force of groundwater movement in confined aquifers is pressure, rather than gravity.

answer: they produce more slow than unicellular organisms.