How many molecules of ascorbic acid(vitaminc,
c6h8 o6 )are in a 500 mg
tablet?

Explanation:

1) molar mass of the C6H8O6, you need to consult the atomic weight of the C, H and O atoms that are in the periodic table: C is 12; H is 1; O is 16 (12x6)+(1x8)+(16x6)= 176g/mol  176 g = 1 mol 0,5 g =  x mol                500mg= 0,5 grams  molar mass = mass÷ moles 176 = 0,5÷ x x= 2,84 x 10⁻³ mol  2) To find the number of molecules present in those 2,84 x 10⁻³ mol we need to multiple the moles by the Avogadro's constant No. of molecules = Avogadro's constant  x n° of moles No. of molecules = 6.022 x 10²³ x 2,84 x 10⁻³ = 1.71 x 10²¹ molecules of vit C.

i think   the answer is c hope i'm right