4. What is the enthalpy change (H°) for the reaction 4NaCl(s) → 4Na(s) + 2Cl2(g), if the reaction 2Na(s) + Cl2(g) → 2NaCl(s) has H° = -821.8 kJ?

Apeak with a retention time of 407 s has a width at half-height (w1/2) of 7.6 s. a neighboring peak is eluted 17 s later with a w1/2 of 9.4 s. a compound that is known not to be retained was eluted in 2.5 s. the peaks are not baseline resolved. how many theoretical plates would be needed to achieve a resolution of 1.5?

Melting and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.

Stage in which a star’s outer layers have started to cool and grow outward?