Search found 103 matches

by Jocelyn Thorp 1A
Tue Oct 01, 2019 12:25 am
Forum: Empirical & Molecular Formulas
Topic: No need to use 100g for calculating molecular/empirical formulas
Replies: 1
Views: 66

No need to use 100g for calculating molecular/empirical formulas

If you're looking for a shortcut, or think that it seems strange that we usually take the mass percentage compositions and pretend there's 100g of substance, well here's a way you can just skip the step altogether. (Note that this is if you're given mass percentage compositions, and the molar mass f...
by Jocelyn Thorp 1A
Mon Sep 30, 2019 11:50 pm
Forum: Significant Figures
Topic: Decimals After Whole Numbers
Replies: 6
Views: 273

Re: Decimals After Whole Numbers

Yes. 100 only has 1 sig fig while 100. has 3 sig figs. The decimal part is an important factor if you are dealing with 0's. Important too, .001 has 1 sig fig, while .100 has 3 sig figs for example. .00100 would have 3. Thanks for the inclusion of the zeroes after the decimal but before any nonzero ...
by Jocelyn Thorp 1A
Mon Sep 30, 2019 11:45 pm
Forum: SI Units, Unit Conversions
Topic: mol, g.mol and g.mol-1
Replies: 12
Views: 218

Re: mol, g.mol and g.mol-1

g*mol-1 is a weird notation, it can be more simply read as g/mol grams PER mole (since taking a negative exponent means multiplying by the reciprocal). I'm not 100% sure why this is the notation is used, maybe to fit everything in one line.

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