Open Question: The difference between energies of formation and energies of atom combination is?
Open Question: How do I calculate the enthalpy change of formation of MgCO3?
From this I was able to work out the enthalpy change per mole of magnesium. The second part of the question is the bit I'm stuck on...
"In a similar experiment, solid magnesium carbonate reacted with an excess of dilute hydrochloric acid and the enthalpy change was found to be -90kJ mol^-1 of magnesium carbonate.
The enthalpy change of the formation of H2O is -285kJ mol^-1 and of CO2 is -393kJ mol^-1. Use this data and your result from above to calculate the enthalpy change of formation of MgCO3."
Can you please talk me through how to do it?
Open Question: Solar System: Explain the roles of gravity & pressure in the formation of the solar system.?
Open Question: Can explosive events occur in the sky can during the formation of a star?
A star forms half way across the galaxy. No one may be able to even notice, since the process happens over millions of years. I would have to say that you're not going to see "rockets red glare" and "bombs bursting in air" unless you're willing to sit and wait over a very long time span.
