Question

How many liters of chlorine gas, at 278 K and 1.1 atm, will react with 25.6 grams of potassium metal?

Answer 1

K + Cl2 ---> 2 KCl

Answer 2

\[PV=nRT\]

Answer 3

\[V=\frac{ nRT }{ P }\]

Answer 4

T= 278K
R= constant value 0.082057
n= mole =mass/Molecular mass
P= 1.1 atm

find the mole first
you are given mass of potassium metal and molecular mass you can get from periodic table

Answer 5

wait i dont understand how to get the mole

Answer 6

Mole= mass/ molecular mass

Answer 7

oh wait a sec

Answer 8

rather there is more to do
just find the mole of potassium metal first

Answer 9

then i'll tell u what to do next

Answer 10

coz you'll need to get mole of chlorine using mole of potassium

Answer 11

is it 39.1?

Answer 12

39.1 is molecular mass of potassium

Answer 13

mass= 25.6 grams

Answer 14

so now find the mole

Answer 15

25.6/31.9 right?

Answer 16

*39.1

Answer 17

i got 0.65

Answer 18

good

Answer 19

now
K + Cl2 ---> 2 KCl

this is not balanced yet
so balance it

Answer 20

would it be 12k+c12 --> 12kc1

Answer 21

Cl = its CL chlorine's element l is not 1

Answer 22

im sorry im not sure how to balance a chemical equation

Answer 23

K + Cl2 ---> 2 KCl
K= potassium
Cl= chlorine

look at right side of the arrow and left side of the arrow
right side
2KCl
which means there are 2 of K atoms and 2 of Cl atoms
left side
K + Cl2
which means there is only 1 K atom and there are 2 of Cl atoms

now see the difference

there is 1 K atom on the left side while there are 2 K atoms on the right side

so ratio is 1:2

to balance it = we need to equal it meaning ratio has to be 2:2
so we can jut multiply K on the left side by 2 meaning

\(2K\) + Cl2 ---> 2 KCl

Answer 24

is it clear?

Answer 25

im going to analyze this so that i fully understand it. but i do get the gist of it

Answer 26

so after its balanced, whats the next step?

Answer 27

?

Answer 28

look at the ratio between K and Cl (on the left side) (by looking at coefficients= numbers before elemnts)

Answer 29

2:1?

Answer 30

or is it 2:2

Answer 31

no its 2:1
(sorry i was away)

Answer 32

before K number is 2
before Cl there is no number which means its 1
so ratio is 2:1
now that means
2 of K give = 0.65 mole
how about 1 = X?
X= 0.65/2
X= mole of Cl

Answer 33

now you have mole of Cl
and the rest of the info is given
so use formula that i gave you above
PV=nRT
V=nRT/P
n= is mole that you just got for chlorine