Question

Calculate the Molarity of
a) .250moles of Na2S in 1.70 L of solution
b) 32.7grams of MgS in 857 mL of solution

Please help! medals given

Answer 1

http://www.occc.edu/kmbailey/Chem1115Tutorials/Molarity.htm

Answer 2

go through this link @Loveforhelp .

Answer 3

Molar mass of Na2S = 78.04454 g/mol

Answer 4

Percent composition by element

Element Symbol Atomic Mass # of Atoms Mass Percent
Sodium Na 22.989770 2 58.914%
Sulfur S 32.065 1 41.086%

Answer 5

ok i am thank you.

Answer 6

@Loveforhelp

Answer 7

for a. i got .14
for b. i got .677

Answer 8

first one wrong. :/
@CGGURUMANJUNATH

Answer 9

first one wrong. :/ ?

Answer 10

can u show me ur steps !

Answer 11

for A. i did mols of solute/L of solution.... = .250mols/1.70L

Answer 12

B. is correct .67
A. im not sure what i did wrong

Answer 13

so u get 0.147 mol/l

Answer 14

oh ok i didnt put the 7 after .14 so it told me it was wrong:/

Answer 15

Thanks lots yaar!

Answer 16

can u show steps for b
?

Answer 17

yes. 32.7(1/56.37)=.580
Lsolution=857(1/1000)=.857
.580/.857 = .677M

Answer 18

56.37 ?

Answer 19

EXCELLENT !

Answer 20

yes 56.37 molar mass of mgS
Thank you, i know this for test bc of you:P

Answer 21

:)