Problem: An unknown compound was isolated, purified, and sent off for elemental analysis. It was suspected that the compound was a hydrocarbon of some type, so a carbon-hydrogen analysis was requested, and the following results were returned: %C, 59.94; %H, 12.08. A reasonable empirical formula was obtained by assuming that the remaining mass was due entirely to nitrogen, but the compound was never resubmitted for a nitrogen analysis.   a) Determine the empirical formula for the compound assuming that it consists of carbon, hydrogen, and nitrogen. Be sure to show your work, and write the empirical formula in the box provided.       The empirical formula is b) It was later determined that the other element in the compound was silicon, not nitrogen. You could repeat the above analysis based on carbon, hydrogen, and silicon, but a quick glance at the periodic table should allow you to immediately write the empirical formula based on the work you did in Part A. 1. What is the empirical formula for the compound assuming that it consists of carbon, hydrogen, and silicon? 2. Explain how you can determine the empirical formula based on the work you did in Part A without repeating the full calculation.

FREE Expert Solution
90% (274 ratings)
Problem Details

An unknown compound was isolated, purified, and sent off for elemental analysis. It was suspected that the compound was a hydrocarbon of some type, so a carbon-hydrogen analysis was requested, and the following results were returned: %C, 59.94; %H, 12.08. A reasonable empirical formula was obtained by assuming that the remaining mass was due entirely to nitrogen, but the compound was never resubmitted for a nitrogen analysis.

a) Determine the empirical formula for the compound assuming that it consists of carbon, hydrogen, and nitrogen. Be sure to show your work, and write the empirical formula in the box provided.

 

 

 

The empirical formula is

b) It was later determined that the other element in the compound was silicon, not nitrogen. You could repeat the above analysis based on carbon, hydrogen, and silicon, but a quick glance at the periodic table should allow you to immediately write the empirical formula based on the work you did in Part A.

1. What is the empirical formula for the compound assuming that it consists of carbon, hydrogen, and silicon?

2. Explain how you can determine the empirical formula based on the work you did in Part A without repeating the full calculation.

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Empirical Formula concept. You can view video lessons to learn Empirical Formula. Or if you need more Empirical Formula practice, you can also practice Empirical Formula practice problems.

What is the difficulty of this problem?

Our tutors rated the difficulty ofAn unknown compound was isolated, purified, and sent off for...as high difficulty.

How long does this problem take to solve?

Our expert Chemistry tutor, Dasha took 8 minutes and 46 seconds to solve this problem. You can follow their steps in the video explanation above.