17. 1.42 g of a compound containing carbon, hydrogen and oxygen (CXHYOZ) is subjected to combustion analysis. The results show that 1.95 g of CO2 and 1.68 g of H2O were produced. What is the empirical formula for the compound? If the molecular weight of the compound is 160 g/mol, what is the molecular formula of the compound?
In: Chemistry
In this question please use
the following values for the fundamental constants:
Planck's constant h=6.626x10-34
Js
Speed of light c=2.998x108m/s
Give your answer to 3
significant figures. Do not enter units!
For large or small numbers, use scientific notation, for
example 1.23E-4
In: Chemistry
2.516 g of a compound containing carbon, hydrogen and oxygen (CXHYOZ) is subjected to combustion analysis.
The results show that 3.082 g of CO2 and 2.705 g of H2O were produced.
What is the empirical formula for the compound?
If the molecular weight of the compound is 160.2 g/mol, what is the molecular formula of the compound?
In: Chemistry
19.What quantity of NaOH(s) must be added to 1.00 L of 0.200 M HCl to achieve a pH of 12.00? (Assume no volume change.)
20.A 65.5-mL sample of 0.14 M HNO2 (Ka = 4.0 x 10–4) is titrated with 0.11 M NaOH. What is the pH after 26.8 mL of NaOH has been added?
21.
What volume of 0.0100 M NaOH must be added to 1.00 L of 0.0500 M HOCl to achieve a pH of 8.00?
Ka for HOCl is 3.5 x 10–8.
In: Chemistry
For a natural gas composed of: C3H8 in volume fraction 0.998
C4H10 in volume fraction 0.002, Please write a balanced chemical
reaction for the combustion of this natural gas in 10 mol%
sub-stoichiometric air (oxygen and nitrogen).
In: Chemistry
Give the 4 quantum numbers (n,l,ml,ms) for an electron, what they describe and their values.
In: Chemistry
Comparing enantioselective carbonyl reduction using CBS reagent,
and
enantioselective biological reduction using an enzyme, what is an
advantage
and disadvantage for each?
In: Chemistry
explain how an emission spectrum is produced experimentally
In: Chemistry
Calculate the change in pH when 9.00 mL of 0.100 M HCl(aq) is
added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq)
and 0.100 M in NH4Cl(aq). A list of ionization constants can be
found here. Calculate the change in pH when 9mL of .1M NaOH is
added to the original buffer solution
In: Chemistry
Enough of a monoprotic acid is dissolved in water to produce a 0.0175 M solution. The pH of the resulting solution is 2.35. Calculate the Ka for the acid.
In: Chemistry
A. If the Mg3N2 is not decomposed, will the reported magnesium to oxygen ratio be high or low? Explain. Hint: The Mg:N mass ratio is 1:0.38 and the Mg:O mass ratio is 1:0.66.
B. An analysis shows that 2.97 g of iron metal combines with oxygen to form 4.25 g of an oxide of iron. What is the empirical formula of the compound?
In: Chemistry
In a 0.5 M solution of a diprotic acid H2A (Ka1 -3.6 x 10-5 and Ka2 - 8 x 10-12 at 25*C) What is the equilirbium concnetration of A2-?
In: Chemistry
a) If a molecule can hydrogen bond, does it guarantee that it will have a higher boiling point than a molecule that cannot? Explain why not
b) If a molecule has a stronger dipole moment than another molecule, does it guarantee it will have a higher boiling point? Explain why not
In: Chemistry
The following factors must be taken into consideration when proposing a mechanism for a nucleophilic substitution reaction. Select all that apply.
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nucleophilic |
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the overall thermodynamics of the reaction |
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basicity |
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the solvent |
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the structure of the substrate |
In: Chemistry