Question

Exam 2: Name PROBLEM 1 (5 points) Capsaicin is the pungent component of various species of Capsicum, including red and green chili peppers, especially c. annum and is the active component of paprika. It has several actions in the body when ingested, such as stimulation of the formation of endorphins in the brain and increased salivation when eating spicy food. 1. The formula of capsaicin is Cy,Higo,N. A sample of capsaicin contains 6.79 x10 molecules of capsaicin. a. How many moles of capsaicin does the sample contain? b. How many atoms of hydrogen does the sample contain? c. What is the molecular mass of capsaicin? Use the following values: 14.00672 amu; O-15.9994 amu C-12.011 amu; H-1.0079 amu; N d. What is the mass of this sample in grams?

Answer 1

From arogadro's law, I mole of capsaicin will contain 6.022 times 10^23 molecules. Therefore mole of capsaicin = molecules of capsaicin /6.022 times 10^23 molecules/mole = 6.79 times 10^20 molecules/6.022 times 10^23 molecules mol^- 1 = 1.13 times 10^- 3 moles of capsaicin. I molecules of capsaicin contains 27 atoms hydrogen. Atoms of hydrogen in sample = molecules of capsaicin in sample times 27 atoms hydrogen/molecules of capsaicin = 6.79 times 10^20 molecules times 27 atoms of hydrogen/molecules = 6.79 times 10^20 times 27 atoms of hydrogen in sample = 1.83 times 10^22 atoms of hydrogen. Molecular mass of capsaicin = (18 times Atomic mass of C) + (27 times Atomic mas of H) + (3 times Atomic mass of O) + Atomic mass of N = (18 times 12.011 amu) + (27 times 1.0079 amu) + (3 times 15.999 amu) + 14.0067 amu inoleoular mass of capsaicin = 305.416 amu 1 amu