Chromium reacts with oxygen according to the equation: 4Cr + 3O2 à 2Cr2O3. Determine the moles of Cr that react with 21.53 moles of O2 .

Once similarity and one difference between a mixture of elements and a mixture of compounds

To find the work done, the force exerted and distance moved are multiplied. a couch is moved twice before you are happy with its placement. the same force was used to move the couch both times. if more work is done the first time it is moved, what do you know about the distance it was moved? a) when more work was done, the couch was moved the same distance. b) when more work was done, the couch was moved less. c) when more work was done, the couch was moved further. d) when more work was done, the couch wasn't moved at all.

The empirical formula of a compound is ch2o and its mass is 120 amu/molecule, what is its formula?