Question

How many moles of sodium chloride (NaCl) solute are in 155 grams of an 85.5 percent by mass solution? (3 points)
1.19 mol NaCl
2.27 mol NaCl
7.75 mol NaCl
10.6 mol NaCl
Essay
Your teacher will grade your response to ensure you receive proper credit for your answer.
4. How many grams of zinc metal will react completely with 8.2 liters of 3.5 M HCl? Show all of the work needed to solve this problem.

Zn (s) + 2 HCl (aq) ZnCl2 (aq) + H2 (g) (4 points)

Answer 1

This is Mathematics group not chemistry.

Answer 2

sorry

Answer 3

im new to this.

Answer 4

but chemistry is applied mathematics :0

Answer 5

No problem, just post it our chemistry section.

Answer 6

0.855*155 grams = 132.5g of NaCl. Convert that to moles.

Answer 7

what do i use to convert it?

Answer 8

Your periodic table. What's the atomic mass of Na, and what's the atomic mass of Cl? Add those together since there's only one of each. Divide 132.5g by the combined atomic mass.

Answer 9

What grade is this for?

Answer 10

10th

Answer 11

Did your teacher show you how to do dimensional analysis?

Answer 12

no... my teavher doesn't teach us anything. im taking a quiz and if i dont get a good grade ill get a din the class and im normally a straight a student...

Answer 13

Sounds like typical high school. Well try typing in dimensional analysis on google. If you can get some practice with that, then converting grams to moles will be a cinch.

Answer 14

http://en.wikibooks.org/wiki/General_Chemistry/Stoichiometry

Answer 15

thank you so much!

Answer 16

(8.2 L HCl) * (3.5 mols HCl/ L HCl) * (1 mol Zn/ 2 HCl)

Answer 17

Even if that last thing is incorrect, just bring it into your teacher and he'll see that you're trying.

Answer 18

i take class online....she said "you either understand, or you dont"...uhhh haha

Answer 19

Hmmm. Well you'll have to bug her anyway. That is just not acceptable.

Answer 20

haha ill try. thank you for your help

Answer 21

Sorry to keep bugging you! It's just that I know how hard it can be with an impossible teacher. I found one last thing that should help you. Knowing how to find the limiting reactant is a very important concept in chemistry (it relates to your last question). http://www.eastfieldcollege.edu/smpe/chemistry/Concepts/Limiting-Reactant-Stoichiometry.pdf

Answer 22

youre not a bother at all! this is all great help!

Answer 23

the same name at gmail if you need more help. Not promising I can help, but I'm fairly good with these conversions.