Element X has three natually occurring isotopes. The mass of each isotope and percent abundance in nature are given below.
Question 1
1.
Question 3
3.
Caffeine, the stimulant found in coffee, is 194.0 g/mol and has a percent composition of 49.48% C, 5.19% H, 28.85% N, and 16.48% O. Find the empirical formula.
Question 4
4.
Caffeine, the stimulant found in coffee, is 194.0 g/mol and has a percent composition of 49.48% C, 5.19% H, 28.85% N, and 16.48% O. Find the molecular formula.
Strychnine, a rat poison, has the following chemical formula:
C21H22N2O2
Round your answers to one decimal place.
1
What do the three isotopes of element X have in common?
Same number of protons.
Same number of neutrons.
Same mass number.
Question 5
5.
Fill in the percent composition for each of the elements in this compound:
