## Search found 103 matches

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...
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 ...
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.