si se desea preparar una disolucion de 2-metil-2-etil-4-noneno donde su pureza es igual a 78%. Si la disolucion es de una concentracion de 4.33 molar cuanto se tiene que pesar para realizar la doisolucion en 689ml

Which statement justifies that phosphine (ph3) is a polar molecule?

Omg imgonnafailnfiedkla use complete sentences to explain how the mass of hydrogen is conserved during cellular respiration.

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.