Anonymous

# chem hw help please? thanks :)?

use the following equation:

C7H8 + HN03 ----> C7H5N3O6 + H20

how many grams of TNT can be made when 829 g of C7H8 reacts with excess nitric acid?

thankss :)

Update:

wow thanks!

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- Anonymous1 decade agoBest Answer
"excess" nitric acid means that the C7H8 is the limiting reagent.

since you know the mass of C7H8, and can figure out the molar mass of it... you can calculate the number of moles

mass C7H8= 829g

molar mass C7H8= 92.15

moles C7H8= mass/molarmass

= 829/92.15

= 9 moles C7H8

since this is the limiting reagent.... this means that there is also 9 moles of C7H5N3O6 produced

rearranging the moles equation... you get:

mass= moles x molar mass

molar mass of TNT = 227.12 g/mol

moles of TNT = 9 moles

mass = (9)(227.12)

=2044 g = 2.04 kg

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