Consider the following equivalent expressions: 3/8÷13/12 and 3/8•a/b What are the values of a and b?

a=12, b=13

Explanation:

a/b is the reverse of 13/12

a = 12

b = 13

Explanation:

Follow the division rule: Keep; change; Flip

Keep 3/8.

Change the division sign to a multiplication sign.

Flip 13/12 (basically the reciprocal). The reciprocal of 13/12 is 12/13. Therefore, the answer is 12/13.

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.