a certain compound containing carbon , hydroden and iron contain ~30% by weight of iron in it suggest the minimum molecular weight(atomic weight of fe=56

Question

inkyvoyd · Answer

Well, if 30% of the weight is iron, then 10/3 the weight of iron is the entire weight.

anonymous · Answer

options are 168  195   159   187

anonymous · Answer

the answer is 187 but i dont know to solve it

inkyvoyd · Answer

Does what I said make sense?

inkyvoyd · Answer

30 percent of the weight is iron. We know that iron is 56. so 0.3x=56
Solve for x.

anonymous · Answer

thanzzz

inkyvoyd · Answer

Does that make sense though?

anonymous · Answer

nop

anonymous · Answer

can u give the formula

inkyvoyd · Answer

contain ~30% by weight of iron in it

inkyvoyd · Answer

The key here is to realize that we are talking about weight.

anonymous · Answer

ok

inkyvoyd · Answer

It basically told us that 30% of the weight is in iron. Then, it told us the weight of iron.

anonymous · Answer

30% of x=56
that is....x=(56*10)/3...=187(approx)

inkyvoyd · Answer

Since is is WEIGHT, we can just use multiplication. Remember, even if if the rest of the 70% is hydrogen, the hydrogen is in WEIGHT, not in number of molecules.