true/fals....please help fast

[kenpharma]

hey...the following are true/false question that i am having trouble figuring them out.....if the sentence is false you need to correct them....(underlined worlds are may/maynot true) please help ASAP.

1) the atomic mass of an atom is based on a comparison with the mass of sulfur-32.
- my guss- true

2) a mole of an ionic compound contains 6.02 * 10^ 23 [u]MOLECULES.[/u]
- myguess- false

3) the molar mass of a substance in grams is always equal to the formula in a.m.u.
-myguess- true

4) one mole Of HN03(three atoms of oxygen) contains 3 ATOMS of oxygen.
-my guess- true
thnaks in advance .....DO NOT JUST SAY DO YOUR HOMEWORK.....I'VE TRIED MY BEST.