Question

http://prntscr.com/ciemwm

I literally tried to solve this three times and kept getting that answer...

Answer 1

@cuanchi ?

Answer 2

let me see,

Answer 3

alright take your time

Answer 4

apparently the reaction stoichiometry is 1:1
then the number of moles of BaSO4 in 0.2193 g will be equal to the number of moles of MSO4 in 0.1131g
Calculate the molecular mass of MSO4 and substract the mass of the SO4 you will get the mass of M

Answer 5

wait so mass MSO4 = mass BaSO4?

(molecular mass*)

Answer 6

cause the directions I used for this told me to get SO4 mass, then subtract from MSO4 to get M mass, then use that to find moles M

Answer 7

NO!!! moles

Answer 8

then from that divide M mass by M moles to get the answer

Answer 9

I would send a pic but idk how xD

Answer 10

yes it is other way

Answer 11

I keep getting 96.04-96.06 range

Answer 12

do you want me to calculate?

Answer 13

oh ... okay o:

Answer 14

yeah, maybe I am doing something wrong o_o

Answer 15

24.38 = Mg

Answer 16

They just want the molecular mass lol

Answer 17

what is the metal with a molecular mass of 24.3?

Answer 18

it says "wrong" 2 tries left

Answer 19

let me try again

Answer 20

I got 0.001248 mol BaSO4 from the given amount 0.2193 g of BaSO4

Answer 21

n=m/MM

n= 0.2193 g/ 233.39 g = 9.396 x 10^-4 moles

Answer 22

Sorry. My school computer is a gigantic butt and wouldn't let me on here for a total 3 minutes

Answer 23

Wait, what is that? o_o

Answer 24

n=m/MM

n= number of moles
m= mass
MM= molecular mass

Answer 25

Hmm I'm not sure what I did wrong the first time around. I got that m/MM value also

Answer 26

So maybe that's where I messed up

Answer 27

Alright I got \(\huge{\color{blue}{120.37g}}\) from the following equation\[\Large{\frac{0.1131}{0.0009396}}\]

Answer 28

ok, now you have to subtract the mass of one mole of SO4

Answer 29

\[\Large{120.37(MSO_{4})-96.07(SO_{4})=24.3}\]

Answer 30

so... 24.3?

Answer 31

OK we are talking about significan figures now?

Answer 32

yes

Answer 33

24.30 I believe, but I'm not sure. All given values in the problem are 4-digit decimals

Answer 34

4-significant figure-digit*

Answer 35

yes that it is Mg molecular mass

Answer 36

we got 24.38 last time lol

Answer 37

Oh, it does say on the "hint" part after that answer:

"Not quite. Try checking your rounding" or something like that

Answer 38

so 24.30 is better?

Answer 39

because I used 9.39 x 10^-4 in place of 9.396 x 10^-4

Answer 40

this website is way too stingy about answer digits -_-

Answer 41

Thank you :)

I still have another oxidation question if that's okay?

Answer 42

It is that Masterinchemistry?

Answer 43

yes lol

Answer 44

what book?

Answer 45

http://prntscr.com/cif67f

Petrucci 10th edition

Answer 46

Nivaldo Tro?

Answer 47

OK

Answer 48

+3

Answer 49

it says to make \(x\) for Carbon and \(y\) for Oxygen

Answer 50

and I know Oxygen is -2, so \(y=-2\)

Answer 51

so I thought \(x=-5\) by calculation

Answer 52

yes O is allays -2


2x + 4y = -2

Answer 53

yes

Answer 54

2x+4y= -2
2x= -4y-2
2x = -4(2)-2
2x = -8-2
2x = -10

Answer 55

\[\Large{x=-\frac{10}{2}=-5}\]

Answer 56

you said
x=C
y=O

2x + 4 (-2) =-2

x= (-2 -(4 (-2))) /2

x= (-2 + 8) /2

x= 6/2 =3

Answer 57

... I realize I forgot to make y a NEGATIVE 2

Answer 58

I'm sorry; I'm silly lol

Answer 59

Thank you :)