Calculate the following amounts contained in 2.0 gram benzoic acid (FW=122.1 g) Number of moles 2....

Question

Question

Answer 1

Answer #1

(1) (a) Number of moles , n = mass/molar mass

= 2.0 g / 122.1 (g/mol)

= 0.016 moles

= 1.6x10^-3 moles

= 1.6 millimoles ----(b)

(2) 142 g of Na2SO4 contains 2x23.0 g of Na

25 g of Na2SO4 contains M g of Na

M = ( 25x2x23.0) / 142

= 8.1 g of Na

Answer 2

Similar Homework Help Questions

The following primary standards can be used for the standardization of bases except. a. Benzoic acid...

The following primary standards can be used for the standardization of bases except. a. Benzoic acid b. Oxalic acid c. CaCO3 d. KHP A solution that may contain NaOH, Na 2CO3, and NaHCO3, alone or in compatible combination was titrated with 0.1200 M HCl. The volume of the acid required to reach the phenolphthalein endpoint was 25.67 mL while 38.13 mL to reach the methyl red endpoint. What are the components of the mixture? a. Na2CO3 only b. NaOH only...
Unknown acid 2 6. Complete the following table. Trial 1 Trial 2 Trial 3 Mass of...

Unknown acid 2 6. Complete the following table. Trial 1 Trial 2 Trial 3 Mass of unknown (8) 0.175 0.120 0.122 Initial buret reading (mL) 0.00 22.37 0.00 Final buret reading (mL) 22.37 44.85 22.83 Volume of NaOH added (mL) 22.37 22.48 22.83 We will assume that the data collected for the first trial is not accurate. 7. What is the average mass of unknown acid for Trials 2 and 3? (Must show calculations) 8. What is the average volume...