I really REally need Chemistry HW help! Pretty please and Thank you :)

So my chem hw is due pretty soon and it's online so it's timed, I have a few questions that I have the answer to but I'm having a hard time getting the correct answers and I'm not sure what I'm supposed to do for each problem. If anyone could please be ever so kind, I would appreciate it greatly. And I will pick best answer...Also please show ALL the work, that way I can understand how you got those answers. Thanks

1.What mass of N2O4 contains 1.00 g of N?

1. 32.8 g
2. 0.328 g
3. None of the other answers
4. 0.305 g
5. 30.5 g

2. How many moles of iron atoms are there in 12.8 g of iron?

1. 4.70x1022 mols
2. 2.13x10-23 mols
3. 715 mols
4. 4.36 mols
5. 0.229 mols

3. How many moles of atoms are there in 401 g of mercury?

1. 2.00 mols
2. 6.66x1024 mols
3. 0.500 mols
4. 1.50x10-25 mols
5. 80,400 mols

4. How many moles of ions are there in 0.500 g of carbonate ions?

1. Not one of the other answers
2. 0.500 mols
3. 0.0114 mols
4. 0.00834 mols
5. 120 mols

5.In the reaction CH4 + 2 O2 -> CO2 + 2 H2O, how many moles of water is/are produced from each mole of oxygen?

1. 1 mol
2. 2 mols
3. None of the other answers
4. 0.5 mols
5. 4 mols

6. What is the mass of 0.0500 moles of nitrogen, N2?

1. 1.40 g
2. 0.0500 g
3. 560 g
4. 0.700 g
5. 0.100 g

1. 92g contains 28 g of N2 therefore 1g contains 92 / 28 = 3.29g
2. 1 mole if Fe = 55.85 g 12.8g / 55.8 = 0.229 moles.
3. 1 mole of Hg = 200g therefore 400g = 2 moles
4. Mass of 1 mole of CO3^2- = 60g 0.5g contains o.50000 / 60 = 0.0083 moles of ions x 4 for all the ions = 0.332 ans = 3.
5. ratio of O2 and H2O are 1 to 1 ans. = 1 mole
6. 1mole of N2 = 28g therefore 0.05 moles= 1.4g