(a) 22 x 102(b) 9.91x 102(c) 11x 1025. Caffiene has a molecular mass o

1.	(a) 22 x 102(b) 9.91x 102(c) 11x 1025. Caffiene has a molecular mass of 194, If it contains 28.9% by mass of nitrogen, number oatoms of nitrogen in one molecule of caffeine is:(a) 4(b) 6(c) 2(d) 3
Answer» 194 g/mole x 0.289 = 56.066 g nitrogen (N) 56.066 g N x 1 mole N/14.007 g = 4.00 moles N Thus, there are 4 moles of N per mole of caffeine or 4 atoms of N in 1 molecule of caffeine.

(a) 22 x 102(b) 9.91x 102(c) 11x 1025. Caffiene has a molecular mass of 194, If it contains 28.9% by mass of nitrogen, number oatoms of nitrogen in one molecule of caffeine is:(a) 4(b) 6(c) 2(d) 3

Answer»

194 g/mole x 0.289 = 56.066 g nitrogen (N)

56.066 g N x 1 mole N/14.007 g = 4.00 moles N

Thus, there are 4 moles of N per mole of caffeine or 4 atoms of N in 1 molecule of caffeine.