Question

How many grams of magnesium oxide can be produced when 125 g Mg react with 102 g O2?

Unbalanced equation: Mg + O2 → MgO

Answer 1

first..balance the equation

Answer 2

Um, you need to add a 2 infront of MgO and also in front of mg right?

Answer 3

2Mg + O2 → 2MgO

Answer 4

Right

Answer 5

125 g Mg = how many moles

Answer 6

You would take the moles given on periodic table and multiply it by 125 right?

Answer 7

no.moles= mass/molar mass

Answer 8

ooooohhhh

Answer 9

so, 125/24.305

Answer 10

?

Answer 11

Yep....... so how many moles

Answer 12

5.14297469656

Answer 13

is that the answer?

Answer 14

Now, 102 g O2 = how many moles

Answer 15

oh, um 102/15.999=

Answer 16

6.378

Answer 17

102/32

Answer 18

Oh, because o is O2

Answer 19

3.18

Answer 20

Yep

Answer 21

Now,
1 mol of oxygen------>2mol of MG
3.18 mol of O2------->6.36 mol of MG

Answer 22

So, oxygen is less in amount

Answer 23

Now,
1 mol of O2-----> 1 mol of MGO
3.18 mol of O2-----> 3.18 mol of MGO

Answer 24

3.18 mol of MGO ------> how many grams

Answer 25

um, to convert from mols to grams you do what?

Answer 26

mass = no.of moles * molar mass

Answer 27

oh, duh. so, 3.18x(Mg+O)

Answer 28

Molar mass of MGO=24.305+15.999

Answer 29

right

Answer 30

sorry im really slow, hang on

Answer 31

40.295