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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: V on October 04, 2010, 03:59:28 PM

Title: % composition/mass/mole equation trouble
Post by: V on October 04, 2010, 03:59:28 PM

The question is:
Ilmenite is a mineral that is an oxide of iron and titanium, FeTiO₃. If an ore that contains ilmenite is 6.75% titanium, what is the mass (in grams) of ilmenite in 1.00 metric ton (exactly 1000kg) of the ore?

So I took .0675 x 1000kg = 67.5kg Ti

then...
67.5kg Ti x 1000g Ti/ 1kg Ti x 1 mole Ti/47.88g Ti x 1mole FeTiO₃ / 1 mole Ti x 151.709 g FeTiO₃ / 1 mole FeTiO₃ = 21387.5 g FeTiO₃ = 2.14X10⁴g FeTiO₃

Only my text says the answer is 2.14X10⁵
And I can't figure out where I've gone wrong with missing a decimal place....
 ???
Thanks for any help you can give me :)

Title: Re: % composition/mass/mole equation trouble
Post by: V on October 04, 2010, 06:34:24 PM

Nevermind. I made a "typo" in my calculator  ::)