A compound has an empirical formula of C2H5. What is true about this empirical formula?
A. It models the structure of the compound.
B. It shows the ratio of elements in the compound.
C.
It gives the mass of each atom in the compound.
D. It indicates the number of atoms in the compound
E.
it describes only this one compound.

Which of the dna typing techniques do you think you would choose if you had to analyze a dna sample? why?

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.

Calculate the mass of 0.750 mol of the following substance. na3po4. , i'm not quite sure on how to set up the problem to solve! : (