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

An empty fuel tank can still contain and therefore can be even more dangerous than one full of liquid fuel.

The diagrams show objects’ gravitational pull toward each other. which statement describes the relationship between diagram x and y? gravity attracts only larger objects toward one another. gravity attracts larger objects only if they are close to one another. if the masses of the objects increase, then the force between them also increases. if distance between the objects increases, then the amount of force also increases.

Calculate the molarity of each of the following solutions. part a) 0.12 mol of lino3 in 5.5 l of solution part b) 60.7 g c2h6o in 2.48 l of solution part c) 14.2 mg ki in 100 ml of solution