Write the rate law
a)the reaction of oxygen with no2 is first order in oxygen and second order in no2.
b)the reaction between no and cl2 is zero order in no and first order in cl2.
c)the reaction between cl2 and chloroform (chcl3) is first order in chcl3 and first order in cl2.

As we know that rate law expression is

(a)

(b)

(c)

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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.