Topscore GenChem math

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alanan84

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So I'm going through doing topscore and I try to do the GenChem without a calculator but am getting questions wrong because I can't seem to do the math on paper. Are the calculations on the exam similar to those on topscore? Is my pen/paper math really that bad, should I be able to do this stuff without a calculator? I would like honest answers please! I mean I can obviously do addition subtraction on paper but the division is really what kills me.

To be a little more specific although it's not limited to this question, calculation of empirical formulas without a calculator. Like 44.3 divided by 195. Am I supposed to be able to do that on paper?
 
Or another one, 600mL of a gas initially at 27C and 755 torr will contain how many molecules?

I understand how to do this question but I had to do it with a calculator. Will I need to be able to work this out by hand on the real test?
 
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