Question

An organic compound contains carbon, hydrogen, and sulfur. A sample of it with a mass of 1.865 g was burned in oxygen to give gaseous CO2, H2O, and SO2. These gases were passed through 305.6 mL of an acidified 0.0200 M KMnO4 solution, which caused the SO2 to be oxidized to SO42-. Only part of the available KMnO4 was reduced to Mn2+. Next, 30.56 mL of 0.0300 M SnCl2 was added to 30.56 mL portion of this solution, which still contained unreduced KMnO4. There was more than enough added SnCl2 to cause all of the remaining MnO4- in the 30.56 mL portion to be reduced to Mn2+. The excess Sn2+ that still remained after the reaction was then titrated with 0.0100 M KMnO4, requiring 0.02733 L of the KMnO4 solution to reach the end point. Based upon all this data, the percentage of sulfur in the original sample of the organic compound that had been burned is

Answer 1

Answer:

What is the main function of the immune system?

Group of answer choices

to recognize and attack disease causing organisms

to maintain a constant flow of blood to wounds

to send messages from the brain to the rest of the body

to break down food into nutrients the body needs

Explanation: