[helpmelol]

Anyone who can help me with answering these questions and showing me how they got the answer would be greatly appreciated, thanks

1. How many grams of Cr are produced by the complete reaction of 2.4 moles of Al with Cr2O3?        Al + Cr2O3  ~~> Cr + AL2O3      balance if necessary

2. How many grams of NF3 are produced by the complete composition reaction of 40g of N2 with F2?    N2 + F2 ~~~> NF3                    balance if necessary

3.  a.  What is the limiting reactant when 50.0 g of N2 reacts with 4.0 moles of H2 to produce NH3? 

      B. how many grams NH3 of are produced
            N2 + H2  ~~~~> NH3         balance if necessary

4. A gas occupying a volume of 725 mL at a pressure of 0.970 atm is allowed to expand at constant temperature until its pressure becomes 0.541 atm.  what is the final volume?

5. When 2.5 moles of H2 are reacted with CO, 24.0 g of CH3OH are produced. what is the percent yield of the reaction.
       H2+ CO ~~~~~> CH3OH         balance if necessary

6. A gas at 850 mm Hg and 25 Degree C occupies a volume of 6.25 L. calculate its volume at STP.

7. Thirty-five ml of a gas at 40 degree C is heated to 80 degree C under constant pressure. What is its new volume?

8.  A mixture of gases contains CH4, C2H6, and C3H8. If the total pressure of the mixture is 1.50 atm and the container contains 0.5 mole CH4, 0.70 mole C2H6, and 0.25 mole C3H8, what is the partial pressure of C3H8 in the mixture?

9. Forty liters of water (H2O) were allweed to decompose at STP:  a) what volume of oxygen was produced?   B) what volume of hydrogen was produced?    and C) how many grams of oxygen were produced?
  2H2O (g) ~~~> O2(G) + 2H2(g)

10. How many moles of oxygen gas (O2) are there in a 3.5 L container under 1.2 atm of pressure and at 37 degree c? how many grams of  O2 is this?

[AWK]

Hint
1, 2, 3, 5, 9, 10 - start from balancing your reaction
4, 5, 6, 8, 9, 10 - use the ideal gas law
8 - use Dalton (partial pressure) law

9 - vapour or liquid water?

[Mitch]

How do you allow water to decompose?

[Borek]

Please read forum rules.

[helpmelol]

thanks all for trying to help me, i am regular chemistry class at college for summer semester and the teacher is taking off for a week and half for a vacation which is around 3 weeks regular semester, so we are having to teach ourselves how to do this, i wasnt looking for the answers to be done just guidance, i have all the problems worked out, i just am going to double check them to make sure i did it right but thanks, the teacher said he threw 3 trick questions and and i posted a new post on two questions which i answered to see if yal agree or disagree with my answers, thanks