Submitted by examrobotsa on Thu, 01/01/1970 - 05:30 Which one of the following statements about the law of conservation of mass is correct?A given compound always contains exactly same proportion of elements.When gases combine in a reaction, they do so in a simple ratio by volume, provided all gases are at room temperatureMatter can neither be created nor destroyedEqual volumes of all gases at same temperature and pressure contain equal number of molecules.