# Chemistry 2 Ap

Calculate the masses of Cr2O3, N2, H20 produced from 10.8 g (NH4)2Cr2O7 [ the 2 belongs to the nh4] in an ammonium dichromate volcano reaction.

I need to know what the balance equation is, and im having a little trouble with it. Pleasee help!

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1. The chemical equation is:
(NH4)2Cr2O7 --> Cr2O3 + N2 + 4H2O
•Find the mass of 1 mole of (NH4)2Cr2O7.
•Divide 10.8g (NH4)2Cr2O7 by the mass of 1 mole to get the number of moles.
•The number of moles of N2 and of Cr2O3 are the same as the number of moles of (NH4)2Cr2O7. The grams of N2 and of Cr2O3 can be found by multiplying each molar mass times the number of moles.
•The number of moles of H2O is 4 times the number of moles of the other compounds. The number of grams of H2O is the number of moles times its molar mass.

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posted by GK

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