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as chem help!

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angel_ak:
which gas closely approaches ideal behaviour at room temp and pressure?
ammonia
carbon dioxide
helium
oxygen

elemis:
I'll give you a hint :

To be an ideal gas you must have little or no intermolecular forces and be as small as possible.

Which one fits the bill ?

Think.

angel_ak:
helium!?

angel_ak:
can i go on for more qs?
have my ppr kal =/

angel_ak:
ammonium nitrate NH4NO3, can decompose explosively when heated.

NH4NO3 ----------------> N2O + 2H2O

what are the changes in the oxidation num of the two N atoms in NH4NO3 when this reaction proceeds?

1. -2, -4
2. +2, +6
3. +4, -6
4. +4, -4

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