A flask of volume 5.00 L is evacuated and 43.78 g of solid dinitrogen tetroxide, N2O4, is introduced at ?196°C. The sample is then warmed to 25°C, during which time the N2O4 vaporizes and some of it dissociates to form brown NO2 gas. The pressure slowly increases until it stabilizes at 2.96 atm. (a) Write a balanced equation for the reaction. (b) If the gas in the flask at 25°C were all N2O4, what would the pressure be? (c) If all the gas in the flask converted into NO2, wha

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Explanation:

jkqn cn c

2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

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o conteúdo de calor de um sistema é igual à entalpia apenas para um sistema que é constante