## Search found 7 matches

Tue Oct 01, 2019 10:30 pm
Forum: Molarity, Solutions, Dilutions
Topic: How to do E15
Replies: 4
Views: 69

### How to do E15

E15 says the molar mass of the metal hydroxide M(OH2) is 74.10 g/mol. What is the molar mass of the sulfide of this metal?

I have no idea how to solve this problem, could anyone explain it to me please?
Tue Oct 01, 2019 10:22 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Units in Answer
Replies: 18
Views: 305

### Re: Units in Answer

My guess would be grams but you really need the entire context of the problem to know for sure.
Tue Oct 01, 2019 10:18 pm
Forum: SI Units, Unit Conversions
Topic: SIG FIGS
Replies: 11
Views: 248

### Re: SIG FIGS

For sig figs in answers, you always use the LEAST number of sig figs. For example if you are working with 1305, 1.2, and .033333, you would use 2 sig figs for the answer because 1.2 only has 2 sig figs.
Tue Oct 01, 2019 10:14 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Balancing Equations [ENDORSED]
Replies: 25
Views: 1047

### Re: Balancing Equations[ENDORSED]

I'm pretty sure most of the time when you balance chemical equations, you will not need to use fractions as stoichiometric coefficients. So I'd say for the most part don't worry about it, just make sure the coefficients are ALWAYS whole numbers. You may not run into many problems with fraction coeff...
Tue Oct 01, 2019 10:11 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Practice Problem E.1
Replies: 6
Views: 80

### Re: Practice Problem E.1

So wait if you are given units in pm, should you always convert to m? Also how many pm's are in 1 m? Not even sure what a pm is to be honest.
Tue Oct 01, 2019 10:08 pm
Forum: Significant Figures
Topic: Rounding
Replies: 3
Views: 82

### Re: Rounding

If the number is 5 or greater, you would round up. So in the example you gave, if you only wanted 2 sig figs, 1.65 would then become 1.70, and if the number was 1.35 it would become 1.40 and so on.
Tue Oct 01, 2019 10:05 pm
Forum: Empirical & Molecular Formulas
Topic: homework problem E9
Replies: 6
Views: 176

### Re: homework problem E9

Basically MgSO4 X 7H20 is the chemical equation for magnesium sulfate heptahydrate. As you can see, "hepta" is the prefix for 7, and hydrate means H20. So in order to calculate the molar mass of magnesium sulfate heptahydrate, you need to write out the full chemical equation so you can mak...

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