If your carboxylic acid is benzoic acid, how many moles of benzoic acid are present in your sample (0.30g, and it is a mixture of three components of equal mass)?

Answer 1

You've said it funny. Do you mean it is 0.1g benzoic acid + 0.1 of X and 0.1 g of Y? If so then
mols = g/molar mass = 0.1g/molar mass benzoic acid which is about 122.

If that isn't what you meant and the mass benzoic acid is 0.3 g, then 0.3/122 = mols benzoic acid.