Asked by Alex

1.The Volume of oxygen required for the complete combustion of 500ML of ethyne at STP..A)2.00ML B)1.25 C)1.71 D)1.00

2.A Chemical Engineer finds that 250ml CuSO4 reacts with excess NaOH to create 2.37g of precipitate.Calculate the Concentration of copper(II) Sulphate solution.

3.Propane is a useful fuel for camping.If 50.0L of propane undergoes complete combustion at STP.Calculate the volume of water vapour produced at STP.

4.How many grams of calcium chloride can be prepared if a student uses 500g if calcium carbonate and 2.00L of a 4.00 Mol/L sodium chloride solution in the reaction.

5. 2KMnoO4 + 5 H2C2O4<----need to use this

Concentration of 0.24L KMnO4 solution required to oxidize 2.7g of Oxalic Acid???

6.What volume of 0.100mol/L aqueous sodium hydroxide(NaOH) is neutralized by 500ml of 0.200mol/L hydrochloric acid(HCI)

7.When 10.0g of potassium chlorate,KCIO3,decomposes,what volume of oxygen is obtained(at 18C and 750 mm HG pressure)

8. 2(NH4)3PO4-->3N2+O2+12H2+2PO3

a)name products
b)Name the reactant
c)type of reaction
Answered by Alex
Someone plz help..i have been working on it for 2 hours..i don't get this..HELP
Answered by MathMate
1.The Volume of oxygen required for the complete combustion of 500ML of ethy<b>le</b>ne at STP..A)2.00ML B)1.25 C)1.71 D)1.00
The balanced equation of the combustion:
2C<sub>2</sub>H<sub>2</sub> + 5O<sub>2</sub> -> 4CO<sub>2</sub> + 2H<sub>2</sub>0
tell us that 2 volumes of ethylene reacts with 5 volumes of oxygen.
Answer : B. 1.25 litre

2.A Chemical Engineer finds that 250ml CuSO4 reacts with excess NaOH to create 2.37g of precipitate.Calculate the Concentration of copper(II) Sulphate solution.
CuSO<sub>4</sub> + 2NaOH -> Na<sub>2</sub>SO4 + Cu(OH)<sub>2</sub>
Molecular weight of CuSO<sub>4</sub> = 159.546
THerefore there are 2.37g/159.546=0.1485 mol in 500 ml. Thus the concentration of CuSO<sub>4</sub> is 0.0297 mol/litre.
Answered by MathMate
3.Propane is a useful fuel for camping.If 50.0L of propane <b>at STP </b>undergoes complete combustion.Calculate the volume of water vapour produced at STP (?).
NOTE: water vapour condenses below 100 deg. The volume calculated is the converted equivalent of water vapour at STP.

C<sub>2</sub>H<sub>8</sub> + 7O<sub>2</sub> -> 3CO<sub>2</sub> + 4H<sub>2</sub>O
Thus each volume of C<sub>2</sub>H<sub>8</sub> produces 4 volumes of water vapour. So 50 litres of propane produces 200 l. of water vapour.
Answered by Alex
Thank you sooooo much MathMate your the best!!!!if u have time can u help me out on #4 and 5 too////Thanks man
Answered by MathMate
Glad to help, but it would be easier for me if you show me some of your work so I can better help you!
Answered by Alex
for #3.Do u suppose to use STP????
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