Gas Requiered

chemistry questions help PLEASE!?

Given the reaction
N2=3H2=2NH3
what is the total number of moles of NH3 produced when 10 moles of H2 reacts completely with N2
1. 2.0
2. 3.0
3 .6.7
4. 15

2.what is the minum number of moles of O2 requiered to produce one mole of CO2?
1. 0.50
2.1.0
3. 2.0
4. 0.25

3. A sample of H2 at STP contains 9.03x10^23 molecules. the volume of the sample is?
1. 33.6L
2. 44.8L
3.22.4L
4. 11.2L

what is the volume of 4.00 moles of CO2 gas at STP?
1. 22.4L
2. 89.6L
3. 11.2L
4. 44.8L

once again, not gonna give answers, but some clues to help you:
1.) look at the reaction and not the ratio of moles between H2 and NH3. 3 moles of H2 makes 2 moles of NH3, so how many moles of NH3 will come from 10 moles of H2? very simple math here...

2.)you'll have to provide a reaction here. but look at the number of oxygen atoms in O2 and CO2...

3.) STP is 1 atm and 273 K. at this temp and pressure, 1 mole of gas occupies 22.4 L... 1 mole is 6.02x10^23 molecules, so find the number of moles and then multiply by 22.4 L.

4.) 1 mole of gas at STP occupies 22.4 L, so 4 moles occupies??

again, these questions are really simple if you just try, so please try and learn it. it really can get interesting later on.

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