Question

This is the chemical formula for epinephrine (the main ingredient in adrenaline): C9H13O3N

A biochemist has determined by measurements that there are 7.8 moles of carbon in a sample of epinephrine. How many moles of hydrogen are in the sample?(Round your answer to 2 significant digits.)

A) 11.00 moles
B) 15.60 moles
C) 20.78 moles
D) 30.67 moles

Answer 1

Using the chemical formula C9H13O3N, we find the number of moles of hydrogen by setting up the molar ratio between carbon and hydrogen. For 7.8 moles of carbon, there are A) 11.00 moles of hydrogen after rounding to two significant digits.

Step-by-step explanation:

To calculate the number of moles of hydrogen in the sample of epinephrine, we will use the molar ratio from the chemical formula. The formula given is C9H13O3N, indicating that for every nine carbon atoms, there are thirteen hydrogen atoms. Given that there are 7.8 moles of carbon in the sample, we can find the number of moles of hydrogen by setting up a ratio: (13 moles H / 9 moles C) × 7.8 moles C = 11.3 moles H.

Therefore, after rounding to two significant digits, we have 11.00 moles of hydrogen present in the sample.