0.1 dm³ of argon contains x atoms .How many atoms are there in 0.2 dm³ of hydrogen gas under the same conditions? A. )×/2
B.)2x
C.)4x

Iknow the answer is a but i don't know why

What is the energy in joules of a mole of photons associated with visible light of wavelength 486 nm?

2-bromo-2-methylbutane undergoes an e1 elimination reaction in the presence of ethanol. in the next reaction only one of the possible products is represented. although the product shown is not the major product of the reaction, notice that there is more than one way it can be produced. complete the mechanism and draw the missing substances.