Question

Determine the mass (in g) of bromide ions in 5.99×10-3 mol of ammonium bromide.

Answer 1

find the total mass: \(n=\dfrac{m}{M}\)


multiply the total mass by Br's mass percent composition

Answer 2

for determining the total mass, what is the mass (m)?

Answer 3

that's what you're finding.

Answer 4

plug in moles, and molar mass then solve for m (total mass).

Answer 5

Ah!

Answer 6

Mn=m
(97.94g/mol)(5.99*10^-3)= 0.5867mol

Answer 7

or sorry, 0.5867g

Answer 8

thats good. now, find the mass percent composition of Br in the compound

http://www.chem.tamu.edu/class/majors/tutorialnotefiles/percentcomp.htm

Answer 9

And how would I determine Br's mass percent composition?

Answer 10

oh ^^

Answer 11

(79.904g/mol)/(97.94g/mol)*100= 81.5846%

Answer 12

81.5846%*0.5867g= 47.8656

Answer 13

when you have percents you have to convert them into decimals:

81.5846 % = 0.815846

0.815846*0.5867g=

Answer 14

Right! So, 0.478656848g? (0.479g)

Answer 15

yep!

Answer 16

Yay!

Answer 17

Thank you!!

Answer 18

it feels good getting the right answer, doesn't it haha you're welcome !

Answer 19

It really does!