B Given the enthalpy changes H1, and H2, below, construct a Hess's cycle that will enable you to find the enthalpy change, Hr, for the reaction:
MgCO3(s) → MgO(s) + CO2(g) ΔΗr,
,
MgCO3(s) + 2HCl(aq) → MgCl2(aq) + CO2(g) + H2O(l) ∆H1,
MgO(s) + 2HCl(aq) -> H2O(l) + MgCl(aq)​ ∆H2

In the reading, yao chen-yuan describes traveling to deliver a message. why was he willing to risk danger to travelto tientsin? he wanted to the boxers with their cause

Frictional forces acting on an object are often converted into energy, which causes the temperature of the object to rise slightly.

The table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.