Hess’s law A -> B Delta H= +30kJ
B -> C Delta H= +60kJ
A.) Use Hess’s law to calculate the enthalpy change for the reaction A -> C
B.) Construct an enthalpy diagram for substances A, B, and C and show how Hess’s law applies.

What is the mass of 0.46 mil of mgcl2

In france, grapes are 1.95 euros per kilogram. what is the cost of grapes, in dollars per pound, if the exchange rate is 1.14 dollars/euro? (2.6)

Before it was launched, a helium-filled balloon had a pressure of 201 kpa at a temperature of 27°c. at an altitude of 15,000 m, the pressure had decreased to 2.5 kpa and the temperature had dropped to -14 °c. the volume of the balloon increased to 59.3 m3. what is the original volume of the balloon? 13 m3 0.85 m3 0.077 m3 1.17 m3