Chemistry help??
2. How many moles of aspirin (C9 H8 O4) are there in a 100.0 mg tablet of aspirin?
3. determine the empirical formula of a compound found to contain 52.11% carbon, 13.14% hydrogen, and 34.75% oxygen.
could u explain how to set it up too? THANKSS!!
oh... and btw the numbers are all subscripts. dont know how to type them :)
Answer:
1) If your compound is (NH)4 CO3, this is the answer N=4, H=4, C=1, O=3
However, there is no such a compound. Maybe, your compound is (NH4)2CO3. And this will be the answer:
N=2, H=8, C=1, and O=3.
2) Compute for the molecular weight.
C = 9 * 12.01 = 108.09
H = 8 * 1.008 = 8.064
O = 4 * 16.00 = 64.00
Total = 180.154g/mol
Then, get the number of moles
moles aspirin = 100.0mg*(1g/1000mg) / 180.154g/mol
moles aspirin = 5.55 x 10-4 moles
3) Assume 100g sample. Then, compute for moles
C = 52.11g / 12.01g/mol = 4.34 mol
H = 13.14g / 1.008g/mol = 13.04 mol
O = 34.75g / 16.00g/mol = 2.17 mol
Divide the calculated no. of mols by the lowest value.
C = 4.34 mol / 2.17mol = 2
H = 13.04 mol / 2.17mol = 6
O = 2.17 mol / 2.17mol = 1
Your empirical formula is C2H6O
i might be wrong but i will try to help.
1. there are 1 mole of ammonia carbon carbonate (btw, does it exist). 4 mole of ammonia and 3 mole of oxygen and 1 mole of carbon
2. change 100mg to g. and then divide it by its molar mass that is 9x12 + 8x1 + 4x16.
3.assume % as g. why? imagine in 100g. u will have 52.11 g. then divide each of them by its molar mass and the find their simplest ratio of mole.
1.6.022*(10)23
2.0.0007336 moles in 100mg
3.C2 H6 03
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