4Al(s)+3O₂(g)→2Al₂O₃(s) How much energy is released when 6 moles of Al₂O₃ is produced?

1) - 3351 kJ
2) -6702 kJ
3) -10053 kJ
4) -13404 kJ

Harvey kept a balloon with a volume of 348 milliliters at 25.0˚c inside a freezer for a night.  when he took it out, its new volume was 322 milliliters, but its pressure was the same.  if the final temperature of the balloon is the same as the freezer’s, what is the temperature of the freezer? the temperature of the freezer is  kelvins.

8.98 dm3 of hydrogen gas is collected at 38.8 °c. find the volume the gas will occupy at -39.9 °c if the pressure remains constant.

What is the percentage of hydrogen in c2h4