Question

The chemical formula for caffeine is C8H10N4O2. a. What is the molar mass of caffeine? b. How many moles are in a 12.0 kg sample of coffee beans (caffeine)? c. How many N atoms are in 25.2 g of caffeine?

Answer 1

Explanation:

a) molar mass of caffeine

=8(12)+10(1)+4(14)+2(16)

=96+10+56+32

=194

12 kg=12*1000=12000gm

b) moles=given weight/molecular weight

=12000/194

=61.85 mol