1)

A 0.464g sample of compound containing the elements
carbon, hydrogen, oxygen, and sulphur was...

Question

1)

A 0.464g sample of compound containing the elements
carbon, hydrogen, oxygen, and sulphur was burned completely, yielding 0.969 g
CO2 and 0.198 g H2O. In a separate experiment, all the
sulphur in another 0.464 g sample was converted to 0.859 g of BaSO4.
What is the empirical formula of the unknown compound?2)Ethyl alcohol, C2H5OH,
is a fermentation produce of sugars in the presence of enzymes. How much
glucose, C6H12O6, would you need to start with
to prepare 4.6 x 104kg of ethyl alcohol if the yield in the
reaction is 64.5%?

The equation for this reaction is
 C6H12O6
+ 3O2->4CO2 + C2H5OH
+ 3H2O3)A solution containing
40.7g of calcium nitrate in a volume of 0.500 L was prepared.

a.
Calculate the number of moles of calcium nitrate in this solution.
 b. 
Calculate the number of molecules of calcium nitrate in this solution.
 c.
Calculate the total number of ions from the calcium nitrate in this
solution.
 d.
What is the molarity of this solution?

David · Accepted Answer

Solution:261112_60201_3 
1) 
Atomic mass of C = 12.011g                                      Molar mass of CO2 = 44.009 g 
Atomic mass of H = 1.008 g                                   Molar mass of H2O = 18.015 g 
Atomic mass of S = 32.066 g                                    Molar mass of BaSO4 = 233.389 g 
Now, 
44.009 g CO2 contains 12.011g C 
0.969 g CO2 contains    12.011  x 0.969  = 0.2645 g C 
                                              44.009 
% of C in the sample  =  0.2645 x 100   =  57.00 
                                             0.464
 18.015 g H2O contains 2.016 g H 
0.198 g H2O contains 2.016 x 0.198  =  0.0221 g H 
                                        18.015 
 % of H in the sample  = 0.0221 x 100 = 4.76 
                                           0.464 
 
 
 233.389 g  BaSO4 contains 32.066 g S 
0.859 g BaSO4 contains 32.066 x 0.859  = 0.1180 g S 
                                             233.389 
% of S in the sample  =  0.1180 x 100  = 25.

1) A 0.464g sample of compound containing the elements carbon, hydrogen, oxygen, and sulphur was burned completely, yielding 0.969 g CO 2 and 0.198 g H 2 O. In a separate experiment, all the sulphur...

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