A Sample of Water Has a Mass of 10

Multiple Choice

A sample of water has a mass of 10.0 grams. What is the number of molecules of water in the sample? (H = 1 u, O = 16 u, and 1 u = 1.66 × 10⁻²⁷ kg.)

A) 1.99 × 10²³
B) 2.00 × 10²³
C) 2.56 × 10²³
D) 3.35 × 10²³
E) 4.25 × 10²³