Which formula equation shows a reversible reaction? a. 2na+f2–> 2naf b. caco3–> cao+co2 c. nh4ci(s)—–nh3( g.+hci( g. 2h2o2(aq)–pt—> 2h2o(i)+o2( g.?

The formula equation that  shows   a  reversible  reaction  is

NH4Cl (s) ⇔ NH3 (g)  + HCl (g) ( answer  C)

            Explanation

Its c I just took the test

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.

answer; natural resources;