Date post: | 01-Dec-2014 |
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Example Problem #1
A compound was analyzed and found to contain 13.5 g Ca, 10.8 g O, and 0.675 g H. What is the empirical formula of the
compound?
Start with the number of grams of each element, given in the problem.
Convert the mass of each element to moles using the molar mass from the periodic table.
Divide each mole value by the smallest number of moles calculated. Round to the nearest
whole number.
This is the mole ratio of the elements and is represented by subscripts in the empirical
formula.
Mwhahahaha >:DD
You stupid creatures, are you ready? Are you
scared? C’mon, back off first! I know all of you are
scared…. >:D
W-we-were n-not scared…. I know we can do it….. You ugly lich! …. We can defeat you soon…We can answer those stupid questions of yours….We already studied about that…Right Jake? We^___^….
Y-yeah, I guess? Ahmmn, Finn we need
a help… I guess?Ahhhhhhhhh….! Goshh, guys we need your help quick….we need
you’re scientific skills…..We can’t do it alone…..Yahhhhhhhh…..Pretty please guys? Could you? I guess
you said yes…that’s great…..whooooooo….
Then if you’re ready finn and jake…Answer this following questions and determine the empirical formula…..If you answer all the questions perfectly…I will back off but if you didn’t answer my questions perfectly then we need to fight…..Wahahahahahahah >:DDD
U-uh-oowhh…Guys, we really need your help…please ! Pretty
please :”(( I wanna save my Princess Bubblegum….
1. 51.28 percent C, 9.40 percent H, 27.35 percent O, 11.97 percent N, MW=2342. 33.18 percent C, 4.60 percent H, 29.49 percent O, 32.72 percent Cl, MW=108.53. 45.71 percent C, 10.48 percent H, 30.48 percent O, 13.3 percent N, MW=2104. 40.00 percent C, 6.67 percent H, 53.33 percent O, MW=330
5. A 10g sample of a compound contains 4.00g C, 0.667g H, and 5.33g O. Find the empirical and molecular formulas. The MW is 180 amu.
Find the empirical and molecular formulas for the compounds given below. Atomic weights: C=12 H=1 O=16 N=14 Cl=35.5
ANSWER THIS PERFECTLY…AND I WILL PROMISE THAT I WILL BRING BACK THE CANDY KINGDOM AND YOUR PRINCESS BUBBLEGUM, FINN….MWAHAHAHHA :D
Hey, you promised us that you will bring back the Candy Kingdom and Princess Bubblegum…
Okey, here………
*KAPOWWW*
Ouch, owwh…my head spins like a hell…err? Where am i?
Anybody here? Wahhhhhhhh… I’m alone :”(((
You alright my highness? I’m happy that you’re alive…I will
die if you’ll going to be out of my life…
I’m alright my dear finn, I owe you my life….Thank you for
saving me….
The end…Thanks for your help guys…