Write a molecular equation for the gas-evolution reaction that occurs when you mix aqueous hydrobromic acid and aqueous potassium sulfite.

Acompound is found to contain 6.1% hydrogen and 93.9% oxygen. find it’s empirical formula.

Nuclear fusion is the source of energy for stars. besides hydrogen, which other element is most likely also common in stars?

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.