Question

what is the quanity of soluter NiCI2* 6H20 added to the solution in moles

solid mass is 8.320 g
solution volume is 250 ml

Answer 1

mass of nickel chloride = (solid mass) * (FW of NiCl2 / FW of NiCl2.6H2O)

because number of NiCl2 in mol = mass of NiCl2 / FW(NiCl2)

So number of NiCl2 is really just:

solid mass / (FW of NiCl2.6H2O)

this is the quantity in mol of solute added. i am assuming they are asking for the molar concentration, then you find it by:

molar concentration = (number of NiCl2 ) / (volume of solution)

Answer 2

numbers to follow later.

Answer 3

BUT WHAT IS THE FORMULA WEIGHT OF NICI2*6H20

Answer 4

THANT IS WHAT I DONT UNDERSTND IS HOW TO CACULATE 6H20

Answer 5

FW is the number of grams of a substance when you have a mol of them. it's the sum of the atomic weights of the atoms in the formula.

Answer 6

give me a sec.

Answer 7

IS IT 237.69108

Answer 8

THAT IS WHAT iGOT

Answer 9

yes

Answer 10

SO NOW WHAT

Answer 11

about 237.6 grams per mol (of NiCl2.6H2O). now divide the solid mass by this number. this gives you the number of NiCl2.6H2O in mol

Answer 12

.03501

Answer 13

NOW HOW DO i FIND THE VOLUME OF THIS IN LITTERS

Answer 14

the volume of the solution? you have it as 250 mL

Answer 15

the "quantity" that the question asks for is the number of NiCl2 (solute) added, i am guessing.

Answer 16

the number of NiCl2 is equal to the number of NiCl2.6H2O

Answer 17

SO HOW DO i FING THE LITTER

Answer 18

OR THE VOLUME

Answer 19

the volume of the solution, it's 0.250 liter (not litter)

Answer 20

they are not asking you for the volume of solute. they want the quantity (or the number of mol). i am guessing of course because i haven't seen the actual question.

Answer 21

OK

Answer 22

WHAT SI THE SOLUTION OF THE MOLARITY

Answer 23

WULLD IT BE 0.350/.250 * 1/ OVER IM STUCK

Answer 24

AM i ON THE RIGHT TRACK

Answer 25

CAN YOU PLEASE SHOW ME

Answer 26

molarity, or molar concentration, is number of NiCl2 over the volume of solution.

so it is (number of NiCl2) / (.250 L)

the unit is mol per liter. that's all!

Answer 27

IS IT 324.51 / .250

Answer 28

it's 0.0350 mol / .250 liter and it comes out to 0.14 mol per liter. try to verify this yourself.

Answer 29

OK GOT IT THANKS

Answer 30

so it's (number of NiCl2) / (.250 L) =
(number of NiCl2.6H2O) / .250 L =
(8.320 grams / 237.59 grams per mol) / .250 L = 0.140 mol per liter

Answer 31

the answer should have three sig figs, as in 0.140 not 0.14 (i know, it's a pain in the butt)