I just finished an elementary chemistry class with a passing grade
Anyway, I believe for your first question, you multiply the moles you have there with Avagadros number (6.0221415 × 10^23).
For the second, you convert grams to moles, then do the same as above.
For the third, you want to do an ideal gas law conversion (PV=nRT). Since its STP, it should be pretty straight forward to fill in those variables.
And for the last, its the same formula as before, but your volume, temperature, and pressure are obviously different than STP.
Anyway, what I've just said could quite possibly be total malarky and the perhaps the reason why I didn't get a stellar grade. Caveat emptor.