Question

For the following reaction, 6.33 grams of hydrogen gas are mixed with excess nitrogen gas. The reaction yields 25.7 grams of ammonia.


N2 (g) + 3 H2 (g) = 2 NH3 (g)





(1) What is the theoretical yield of ammonia ?

grams



(2) What is the percent yield for this reaction ?

%

Answer 1

http://en.wikipedia.org/wiki/Yield_%28chemistry%29

Answer 2

so for theoretical yield you take a look at what you put in and how much you get out. N2 is14g/mol. ammonium is (14+3)*2 (number of molecules we get after the reaction).

Answer 3

for actual yield you have to multiply 2 molecules of ammonia by 25,7 gramm.

Answer 4

for percentage yield: actual yield/theoretical yield*100

Answer 5

the actual yield is what they gave you 25.7 grams

The theoretical is what you find through the use of the stoichiometric coefficients

Answer 6

so use this percent yield = (actual yield/theoretical yield)*100

Answer 7

lol yep

Answer 8

For the following reaction, 6.11 grams of oxygen gas are mixed with excess nitrogen monoxide. The reaction yields 14.1 grams of nitrogen dioxide.


2 NO (g) + O2 (g) = 2 NO2 (g)





(1) What is the theoretical yield of nitrogen dioxide ?

grams



(2) What is the percent yield for this reaction ?

Answer 9

the same way you did in the first question

Answer 10

ok, convert the mass of oxygen to moles

Answer 11

nope, use:

moles=mass/molar mass

Answer 12

okay this is ver diffucult for me so please bear with me

Answer 13

can you please help me and THEN i WILL KNOW HOW TO DO IT

Answer 14

what are you having difficulty with?

Answer 15

the moles=mass/molar mass

Answer 16

it's an algebraic expression, you plug in your values and then solve for your unknown.

just like this: x=y/z

whats the molar mass of oxygen gas? (remember that it's 2 atoms of oxygen per molecule)

Answer 17

The molar mass of oxygen gas is 32.

Answer 18

sorry, yes thats right, now plug in what you have into the equation and solve for moles.

Answer 19

so 32 is the therotical yield

Answer 20

no, you first have to find the moles of oxygen you have

Answer 21

moles = mass/molar mass

Answer 22

what did you do?

Answer 23

did you find my solution helpful last time

Answer 24

yes I did find it helpfull

Answer 25

nope, moles = mass / molar mass

whats the value for mass, whats the value to molar mass

Answer 26

molar mass is 32

Answer 27

and the mass?

Answer 28

how do i find that

Answer 29

it's given in the question

Answer 30

no were dealing with oxygen, 6.11 grams

now, plug it into moles = mass / molar mass

Answer 31

moles=61.1/32

Answer 32

close, moles = 6.11/32

what do you get?

Answer 33

.1909375

Answer 34

now you're goin to use the balanced equation

2 NO (g) + O2 (g) = 2 NO2 (g)

\[\frac{ molesO _{2} }{ 1 }=\frac{ moles of NO _{2} }{ 2 }\]

plug into this and solve for for moles of NO2

Answer 35

notice that you i divided each species by it's coefficient in the reaction

Answer 36

.381875

Answer 37

is that the anser

Answer 38

that is what a I got

Answer 39

now you have to convert back to grams of NO2

Answer 40

look at what i have attached very clearly please ,you just caused me some ink

Answer 41

yes that is the answer for the theoritical value of NH3

Answer 42

the answer to the 1st question

Answer 43

now i ll do the second part and scan

Answer 44

oh is see

Answer 45

use the same procedure

Answer 46

he's right, you use the same procedure for all of these problems.

you got 38 grams of NO2?

Answer 47

how did you get 38?

Answer 48

how did you get 38 grams of NO2?

Answer 49

I dont know what I di

Answer 50

lol okay, well thats not good.

you had how many moles of NO2?

Answer 51

.381875

Answer 52

moles of oxygen = 6.11/32

if 2 NO2 = 1 O2

X NO2 = 6.11/32

MOLE OF NO2= MASS/MM

MASS OF NO2=(6.11/32)*2 *46


17.56625 GRAMS

Answer 53

ok that is the answer

Answer 54

yep, but honestly telijahmend you're not doing her a favour by just typing out the answer

Answer 55

thanks you can you help with one more so I UNDERTAND IT A LITTLE

Answer 56

percent yield=actual yield/theoritical above

now actual is 14.1

theoritical= above

so go on from here

@aaronq is right so do the algebra now

Answer 57

because this is very vey confusing to me

Answer 58

i got the anserw

Answer 59

telijamed

Answer 60

you have the formula so go ahead and just put in the values

Answer 61

then multiply by a 100 since it is percent yield

Answer 62

ok i am going to start over in adiifent page with a new question

Answer 63

I go the anser

Answer 64

is is 80.1 percent

Answer 65

(14.1/17.56625) *100 just go ahead and get the answer now

Answer 66

80

Answer 67

80.26 %

Answer 68

can you please help me on another questio

Answer 69

just go ahead and keep your periodic table by your side and it ll be fine

Answer 70

you ve got to put in so much effort

Answer 71

i know

Answer 72

but can you helpnother question like this

Answer 73

so I get understanding of this