Question

3. 5. According to the bottle that the aspirin tablets came in, they contain 325 mg of acetylsalicylic acid (C₉H₈O₄). Determine the number of moles of acetylsalicylic acid in each tablet.

Answer: .0018

6. How many mL of 0.100 M NaOH is required to react completely with the 325 mg of acetylsalicylic acid in the tablet?

Answer 1

5)

Molar mass of C9H8O4 = 9*MM(C) + 8*MM(H) + 4*MM(O)

= 9*12.01 + 8*1.008 + 4*16.0

= 180.154 g/mol

mass(C9H8O4)= 0.325 g

we have below equation to be used:

number of mol of C9H8O4,

n = mass of C9H8O4/molar mass of C9H8O4

=(0.325 g)/(180.154 g/mol)

= 1.804*10^-3 mol

Answer: 1.80*10^-3 mol

6)

mol of NaOH required = number of mol of C9H8O4

M(NaOH)*V(NaOH) = 1.804*10^-3 mol

0.100 M * V = 1.804*10^-3 mol

V = 1.804*10^-2 L

V = 18.0 mL

Answer: 18.0 mL