The double-replacement reaction between silver nitrate and sodium bromide produces silver bromide, a component of photographic film. (a) If 7.50 mol of silver nitrate react, what mass of sodium bromide is required? WebAssign will check your answer for the correct number of significant figures. (b) What mass of silver bromide is formed?

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.

14 days is the half-life of phosphorus-32