Chemistry 2-20-09 Molar Mass Conversions
CHEMISTRY: Praise the Lord for Fridays!! So how many water molecules in that drop? Here’s the lecture from today on using molar mass as a conversion factor. You did a great job on the problems! Have a wonderful weekend, and spend some time memorizing polyatomic ions, acids, and the chemical names for those common substances you researched. 
February 21st, 2009 at 2:04 PM
Ms. Skinner I was sick wed-fri and I have been told the research is due Monday.Is it due Friday or Monday?
Sorry for the late blog I was sick and unfortunately unable to meet the deadline.
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February 22nd, 2009 at 3:28 PM
Hey Anna!
Ms. Skinner changed the deadline.
The research is due Monday.
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February 22nd, 2009 at 11:59 PM
I still need help with the Q formula
Mis skiner i m sorry i posted late but i was un able to acsess the internet till tonight.
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February 23rd, 2009 at 9:33 AM
Ms. Skinner, My internet was down all weekend, and I was not able to do my post until today in the computer lab. but isn’t the Q formula QS= QG x CF?
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February 23rd, 2009 at 9:50 AM
What is used as a conversion factor between amount in moles and mass in grams of a given compound or element?
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February 23rd, 2009 at 9:51 AM
Leslie-
Molar mass is used as a conversion factor.
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February 23rd, 2009 at 11:00 AM
do you always have to calculate molar mass before you can do the “Q” formula?
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February 23rd, 2009 at 11:03 AM
ashley,
yes you do have to figure out the molar mass before you use the Q formula
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February 23rd, 2009 at 11:29 AM
what is the unit for formula mass?
what is it for molar mass?
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February 23rd, 2009 at 12:55 PM
Bhale:
The unit for formula mass is u. The unit for molar mass is grams:g or grams per moles:g/mol
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February 23rd, 2009 at 7:24 PM
So how do you find the gram?
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February 23rd, 2009 at 8:25 PM
Do we get sig figs from the given amounts when converting?
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February 24th, 2009 at 10:32 AM
hey Rachel-Chloe. you only get sig figs from the given and never the conversion factors
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February 24th, 2009 at 2:14 PM
Hey Ms. Skinner, what effect does the charge have on the formula’s name?
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February 24th, 2009 at 2:51 PM
how do you use the Q formula to go from grams to molecules
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jake wilson Reply:
February 27th, 2009 at 1:45 PM
mine is the one that says how do you use the Q formula to go from grams to molecules. i didnt put my whole name the first time
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February 24th, 2009 at 8:03 PM
Jake-
grams>moles>molecules
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February 24th, 2009 at 10:24 PM
When going from moles to molecules to grams, in the last step do you put a 1 with the molecule to cancel it out?
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February 25th, 2009 at 9:12 AM
aniah,
no,the one always goes with the moles and for the molecules you put 6.022*10 to the 23rd.
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February 25th, 2009 at 9:27 AM
if you have 0.0236 g of a substance how many sig figs is that?
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February 25th, 2009 at 4:10 PM
Rachel-Chloe,
yes,the amount of sig figs in the given problem dtermines how many sig figs your answer will have! :]
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Jed P. Reply:
February 25th, 2009 at 8:16 PM
In the number 1500, do the zeros count as sig figs?
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February 26th, 2009 at 7:18 AM
Kaele…
thats 3
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February 26th, 2009 at 4:11 PM
Jake- the Q formula never changes you just plug in what you need
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February 26th, 2009 at 8:15 PM
Jed, I think.. (how come your box is grey, I can’t read your name), no the zeros don’t count unless there on the right side of a decimal or between two other sig. numbers
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February 26th, 2009 at 8:20 PM
How many sig figs is 6.00034?
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February 26th, 2009 at 8:22 PM
whats the difference in molar mass and formula mass?
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March 2nd, 2009 at 5:57 PM
Molly-The work is all the same the only thing differant is the units.formula mass unit is aum and molar mass is g/mol.
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