Question

Given the mass ratios of iron to oxygen, which of the following samples could be the mineral hematite, Fe2O3?

A. 2.3:1

B. 3:2

Answer 1

@JFraser Is it A or B?

Answer 2

the question is very specific, it says iron:oxygen, so the iron HAS TO go first

Answer 3

So it's A?

Answer 4

but you need to use the MASS ratios

Answer 5

Then the answer is A right?

Answer 6

what are the \(masses\) of iron and oxygen in \(Fe_2O_3\)

Answer 7

I don't know...can you tell me?

Answer 8

not even close, what periodic table are you using?\

Answer 9

Oxygen
Chemical Element
Oxygen is a chemical element with symbol O and atomic number 8. It is a member of the chalcogen group on the periodic table and is a highly reactive nonmetallic element and oxidizing agent that readily forms compounds with most elements. Wikipedia
Symbol: O
Atomic number: 8
Electron configuration: 1s2 2s2 2p4
Boiling point: -297.3°F (-183°C)
Electrons per shell: 2,6
Atomic mass: 15.9994 ± 0.0004 u
Discoverers: Carl Wilhelm Scheele, Joseph Priestley

Answer 10

Iron
Chemical Element
Iron is a chemical element with symbol Fe and atomic number 26. It is a metal in the first transition series. It is by mass the most common element on Earth, forming much of Earth's outer and inner core. Wikipedia
Symbol: Fe
Electron configuration: [Ar] 3d6 4s2
Melting point: 2,800°F (1,538°C)
Atomic number: 26
Boiling point: 5,184°F (2,862°C)
Electrons per shell: 2, 8, 14, 2
Atomic mass: 55.845 ± 0.002 u

Answer 11

so use the MASSES

Answer 12

find the mass of 2x irons : 3x oxygens

Answer 13

ohhh so it's B! thank you for explaining it! :)

Answer 14

no, you need to use the masses and multiply them by the right number of each pieces and simplify the ratio

Answer 15

wait what? i did that and got 3:2

Answer 16

there's a big, and important, difference, between an \(atomic\) ratio, like the numbers in a formula, and a \(mass\) ratio, which you have to use the masses from the periodic table

Answer 17

the ATOMIC ratio of oxygen to iron is 3:2, but the question asked for IRON to OXYGEN

Answer 18

and it asks for the MASS ratio

Answer 19

didn't you also get 3:2?

Answer 20

nope

Answer 21

are you serious?

Answer 22

very

Answer 23

can you show me ur work so i can compare it to mine?

Answer 24

each iron atom weighs 55.8amu. There are 2 of them in the formula (2x55.8) = 111.6amu

each oxygen atom weighs 16amu. There are 3 of them in the formula (3x16) = 48amu

Answer 25

the ATOMIC ratio of iron to oxygen (iron first) is 2:3

the MASS ratio of iron to oxygen is 111.6amu : 48amu

Answer 26

But that makes no sense because if the question is asking for mass then why isn't your mass ratio one of my answer choices?

Answer 27

reduce 111.6 : 48 to smaller numbers

Answer 28

(divide both by 48)

Answer 29

2.325:1

Answer 30

and is that close to one of your choices?

Answer 31

Yeah that's A!

Answer 32

you need to read VERY carefully and use the periodic table as a reference for all sorts of info

Answer 33

there's a big difference between a mass ratio and an atomic ratio

Answer 34

Ok thanks sooo much for explaining it to me so clearly! :)