# molar

1. ### Molar Mass problem

How many moles of O atoms are in 2.03 mol of Fe_2_O_3_, the primary component of iron-based rust? I need to do this problem in dimentional analysis, but have no idea how to do it? I've tried this problem for 20 minutes and I still can't get things to cancel out. Thank you for any help!
2. ### need help with Molar enthalpies

Sorry, if I am not allowed to ask non math related question 1) add 60 ml of 1.0 mol/L Sodium Hydroxide solution to a polystyrene calorimeter. 2) mix it with 40-ml sample of 1.0 mol/L sulfuric acid solution in a graduated cylinder. 3) Add the acid to the base, stirring slowly with the...
3. ### molar masses?

I don't know if i am allowed to post this here, and i apologize in advance if i am not supposed to. but i am trying to do my homework and the book doesn't explain it too well. how did they go from 3.50 mol of copper to 63.55 g as the molar mass?
4. ### Molar solubility

Determine the molar solubility of AgCl in pure water. [AgCl]=1.77x10^-10