Question

(helpful step by step ) Finding moles? and Masses?
Approximate volume of vinegar sample: 6.01mL
mass of flask(g): 93.6636
mass of flask+vinegar(g): 99.3648
mass of vinegar(g): 4.7012
1) initail buret reading of NaOH(mL): 0
2) Final Buret reading of NaOH(mL): 13.3
3)Volume of NaOH used(mL): 13.3
4) Molar concentration of NaOH(mol/L): 0.1982
Questions:
5) Moles of NaOH added(mol): ( I got 0.002187 is this correct?)
6)Moles of CH3COOH in vinegar(mol): ?
7)Mass of CH3COOH in vinegar(g): ?
8) Percent by mass of CH3COOH in vinegar(%): ?