Question

I really need help with this one:


This is whats given:
300k
2atm
248.3 g NaCr2O7
99.6 g NH4Cl

We need to find the volume of N in liters.

Na2Cr2O7 + NH4Cl --> NaCl +Cr2O3 +H2O

Answer 1

that equation is not right, where did the Nitrogen go?

Answer 2

jeez! great I didnt add it! Its on the end haha...

Answer 3

its just + N2
thanks..

Answer 4

okay, so balance the equation and find how many moles you have of N2

then use PV=nRT, and solve for V

Answer 5

but the part i am confused is the

248.3 g
and
99.6 g
which one to use?

Answer 6

the first one doesn't have nitrogen, so it wouldn't contribute to the final nitrogen product, right?

Answer 7

maybe just show me how…

Answer 8

did you balance the equation?

Answer 9

sorry, yes I did. But I stil dont understand what I should next.

Answer 10

find the number of moles of reactant NH4Cl

n = 99.6 g/molar mass of NH4Cl

use the coefficients of the balanced reaction to find the moles you produced

plug all the values they gave you into PV=nRT

Answer 11

yeah i did that but what about the other one (248.3 g)?

Answer 12

they just gave you that to try to confuse you

Answer 13

oh okay, ahah….

Answer 14

so how do I know which one to choose….

Answer 15

since the other one doesn't have nitrogen in it?

Answer 16

they just want you to know what you're doing. yeah, well you wouldn't use something that doesn't have what you're looking for.

Answer 17

like if they asked for the amount of Chromium, you wouldn't use NH4Cl

Answer 18

okay, makes sense.

Answer 19

(Y)