A chemical X breaks down to chemical Y. At t=0, [B] = 0.00M at t=5.00 s, [Y] = 0.150M/ What is the average reaction rate? Group of answer choices

-0.300 mol/Ls

0.300 mol/Ls

-0.0300 mol/Ls

0.0300 mol/Ls

this is the answer, but check the calculations first and see if it matches 0.300 mol/Ls

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.

water at room temperature is flowing through a pipe with pressure taps located 10 ft apart along one section of the pipe, which are connected to a mercury (s=13.6) manometer.