Angie S.

asked • 02/26/18

A certain ore is 35.3% nickel by mass. How many kilograms of this ore would you need to dig up to have 75.0 g of nickel?

 A certain ore is 35.3% nickel by mass. How many kilograms of this ore would you need to dig up to have 75.0 g of nickel

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J.R. S. answered • 02/27/18

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35.3% of what = 75 g.
0.353x = 75
x = 212.5 g = 0.213 kg
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Jason H.

Would not the answer be .212kg? 
Technically the answer .0353x=75 is 212.46....grams. 
If we are to round, would it not be off the significant figures, which there are three?
Then only when we converted to KG, do we round; .21246....KG? Which would be .212kg.
Am I missing something?  
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08/28/18

J.R. S.

tutor
You are not missing anything.  I was careless in my rounding and significant figures.  Indeed, the correct answer, to three significant figures would be 0.212 kg.
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08/28/18

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