2Al(S)+1.5O2(S)→Al2O3(s) H= -1676.0 KJ 2Fe + 1.5O2 (S) →Fe2O3(S)

Then the enthalpy change for the following equation is KJ

2Al + Fe2 O3(S) → 2Fe +Al2O3(s)
pls i dont have time

Melissa is interested in her family tree and how her family has changed over its many generations. melissa probably more closely resembles

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

When a beta particle is emitted, the mass number of the nucleus a. decreases by one b. increases by one c. remains the same d. decreases by two