Question

Walk me through it
How many grams of zinc metal will react completely with 5.4 liters of 2.8 M HCl? Show all of the work needed to solve this problem.
Zn (s) + 2 HCl (aq) ---> ZnCl2 (aq) + H2 (g)

Answer 1

http://openstudy.com/study#/updates/4f6be83ee4b0772daa077864
i hope it helped...

Answer 2

do u get the working?

Answer 3

No I wanted to wait for you haha you make it make sense

Answer 4

would you like to walk with me through this ?

Answer 5

Sure

Answer 6

ok from equation can u tell me how many mole of Zn reacts with how many moles of HCl?

Answer 7

2.8 moles of HCI right?

Answer 8

where does 2.8 come from? i didnt find it from the equation

Answer 9

oh

Answer 10

"How many grams of zinc metal will react completely with 5.4 liters of 2.8 M HCl?"

Answer 11

ok @Somy came better she know how well she can make u unserstnd s this :P

Answer 12

Okay thank you!

Answer 13

bbye

Answer 14

lol where are we?

Answer 15

Well all I know is that there are 2.8 moles of HCI

Answer 16

how did u get it?

Answer 17

I literally says it in the equation

Answer 18

"How many grams of zinc metal will react completely with 5.4 liters of 2.8 M HCl?"

Answer 19

How many grams of zinc metal will react completely with 5.4 liters of 2.8 M HCl? Show all of the work needed to solve this problem.
Zn (s) + 2 HCl (aq) ---> ZnCl2 (aq) + H2 (g)

Answer 20

2.8 M
M is molarity, thus its CONCENTRATION not mole

Answer 21

Ohhhh

Answer 22

yeah so for HCl
you are given molarity = 2.8 M
and volume = 5.4 L

Answer 23

Molarity and concentration are same things thus units are same
volume we always convert it to dm3 right? you are given in Liters
Liters is equal to dm3 so these two are also same thing

Answer 24

get it?

Answer 25

Okay so if it's already in Liters I don't have to touch it

Answer 26

yes exactly :)

Answer 27

what is the formula of molarity?

Answer 28

M = moles solute/liters solution

Answer 29

yup so you need to find mole right?

Answer 30

Yeah

Answer 31

good so find it now

Answer 32

2.8/5.4 = 0.51

Answer 33

wrong

Answer 34

hmmm u still have problems with making subjects in formulas

Answer 35

i think we should have a small tutorial on this later

Answer 36

Okay

Answer 37

conc= mole/dm3
if you make mole as subject that will be mole= conc*dm3

Answer 38

Okay 2.8*5.4 = 15.12

Answer 39

yup that's right

Answer 40

Zn (s) + 2 HCl (aq) ---> ZnCl2 (aq) + H2 (g)

okay so mole of 2HCl is 15.12moles
what is mole of Zn?

Answer 41

look at the ratio between HCl and Zn
in reaction its 1:2 right?

Answer 42

I hate ratios but I see that

Answer 43

yeah so if
2 -> 15.12 mole
1 -> X

Answer 44

7.56!

Answer 45

bingo :)

Answer 46

so Zn= 7.56 mole

Answer 47

now tell me what is mole formula?

Answer 48

n = m/M

Answer 49

yup and u need to find mass right?

Answer 50

u know Mr of Zn from periodic table and u already calculated mole

Answer 51

Whats the formula for that?

Answer 52

molecular mass

Answer 53

formula for what?

Answer 54

wait all I have to do is look of the molecular mass of Zn right

Answer 55

which is 65.

Answer 56

n = m/M
n = 65/ 7. 56
= 8. 59

Answer 57

noo

Answer 58

mole= mass/ Mr

Answer 59

so mass = mole*Mr

Answer 60

7.56*65 = 491. 4

Answer 61

yup

Answer 62

Now we do mole = mole/Mr?

Answer 63

no lol we are done :)

Answer 64

you got the mass of zinc they asked you for :)

Answer 65

Thank you:)

Answer 66

you are welcome :) i'll open a new question where i'll teach you how to work with formulas ok?

Answer 67

Okay!

Answer 68

cool :)